Best Online Slots Sites of 2023 | UK List

Author: Ioana Nutulescu
Reviewer: Tudor Turiceanu

We bring you a top-quality list of slot sites available in the United Kingdom. Hundreds of hours of our work bring you hundreds of vetted casinos!

How we test & rate?

Read more

Every UK slot site you see here has been tested with two main focuses.

Full review

Our reviews have multiple parts and thousands of words each. This length and level of detail are because we want to check all the essential aspects.

  1. We look at the licencing to have a base layer of safety, security, and player fairness.
  2. We count the games and the game providers to see how much variety you have as a member. Then we see how they are grouped, detailed, and how easy it is to navigate the lobby.
  3. We use the bonuses and finish playing them. As such, we can assess if the terms conform to the player experience and how likely you are to cash out.
  4. Each review implies that we use at least 4 different payment services when permitted by the casino, 2 to deposit and 2 to withdraw. Thus, we can tell you what we recommend to protect your payroll.

Slot features

We know the games entirely, including what features mean and how they affect your play. We test them for every game like this:

  1. RTP – How much will the game deliver on a long time of continuous play
  2. Volatility – How likely the pot results may change dramatically
  3. Paylines – How many winning combinations the game embed
  4. Bet limits – Can your budget fit the average gameplay?
  5. User experience – Are there any glitches that can annoy you?
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Top 20 Slot Sites

MrQ Casino
Code: FISHIN30 Copied !

MrQ Casino Review




MrQ bonus:

30 no wagering spins on Fishin Frenzy Megaways.

What to keep in mind:

  • This offer has no wagering requirements attached to it, which means any returns stay yours.
  • You need to use the code FISHIN30 when you make your first deposit greater than £10.
  • Your single requirement is to spend £10 within 12 hours of the deposit.
  • Be aware that spending on Roulette, Blackjack and other table games doesn’t count for the Spend requirement.
  • The spins are available in Fishy Frenzy Megaways for 48 hours after being credited to your account.
  • Each spin is worth £0.1.
  • Generated winnings are not capped, but a large win may be subjected to security checks.
  • Collusion or promotional abuse leads to account suspension.

How to attain it:

  1. Create your account and complete the necessary verification checks.
  2. Make your first deposit and wager it in the casino.
  3. Within 10 minutes, the spins will be added to your account.

Visit MrQ and explore its comprehensive Responsible Gaming toolset before commencing play.

MasterCard Pay by phone PayPal Visa
First deposit only. Min deposit & spend £10. Max 30 spins on Fishin Frenzy Megaways at 10p per spin. Spins credited upon spend of £10 T&C Apply
Hot Streak Casino
Code: BASS20 Copied ! Just added New casino

Hot Streak Casino Review




What you will receive

Creating an account at this casino will net you 100 cash spins upon making the first deposit of at least £20.

How to claim the offer

  • Access the platform’s main page
  • Make an account
  • Make your first deposit while using the code BASS20
  • Now the bonus is activated

What you should remember

  • The bonus is first locked behind you verifying your account
  • You must wager the deposit before the spins are granted
  • Maximum earnings from the spins are locked at £200
  • The spins can only be used on Big Bass Bonanza
  • The value of each spin is set at £0.10

If you have any issues with how the bonus works, please read the attached bonus terms and conditions. 

MasterCard PayPal Trustly Visa
First deposit only. Min deposit and stake £20 on slots only. Promo code BASS20 required. Max 100 cash spins. Max one claim during promo period. Spins valid on Big Bass Bonanza. Total spin winnings capped at £200 per claim. T&C Apply
Code: GAMES100 Copied !

Betfred Review




Here’s the offer:

If you are a new Betfred player who’s planning to deposit for the first time, you may redeem a promotion that consists of 100 rotations on Starburst.

What can you do to claim it?

First, you must create a new account at Betfred. Enter the GAMES100 bonus code when you register, then move on to verifying your account. Deposit £10 and stake your cash balance to receive the promotion.

The conditions to abide by:

You will get the extra rounds within 48 hours of your fulfilling the conditions. Then, you may use them for 7 days. You are not eligible for the bonus if you deposit with an e-wallet.

Finally, remember to check the casino’s Terms and Conditions for full promotional coverage.

Maestro MasterCard Visa
New customers only. Register with code GAMES100. Deposit and stake £10 or more, within 7 days, on Slots at Betfred Games to receive 100 Free Spins on selected titles. Free Spins credited within 48 hours. Free Spins are valid for 7 days. E-Wallet & Card restrictions apply. SMS validation may be required T&C Apply



The available offer:

Upon registering and depositing at least £10, you will receive a £50 bonus to use on the available games.

Keep in mind these rules!

  • This promotion is valid only for a set period of 30 days;
  • It carries wagering of 40x bonus amount;
  • Players can only use it on a specific list of games included within the Terms and Conditions section;
  • You must deposit £10 or more to be able to activate this offer.

How to get this promotion

  1. Tap our link and create an account at Ladbrokes Casino;
  2. Fill in your personal data and verify your account;
  3. Make your first payment of at least £10 on whichever game is available for this offer;
  4. Accept the specific T&Cs in 14 days.
Maestro MasterCard Visa
New Casino players only. Deposit required. Bet 10+ on qualifying games. 40x wager reqs (bonus only) on selected games. Accept Bonus within 14 days. Bonus valid for 30 days. Certain deposit types excluded. Player restrictions T&C Apply



Offer’s details:

Make your first deposit of £20 and, you can get a £50 bonus.

Remember that:

You’ll receive £20 that can be used on any casino game and £10 that can be used only on slots and live casino games. To receive the latter offer, you must claim the chosen bonus on the promotions page. The £20 bonus comes with a 5x rollover request, while the other bonus comes with a 10x wagering request.

How to activate the bonus:

  1. Click on the promotional button;
  2. Create an account;
  3. Fund your account with over £20.

Check out the bonus policy before you claim the promotion!

Bank Transfer Maestro MasterCard PayPal Visa

Coral Review




This is what you get:

£50 + 20 extra rounds to play on Eye of Horus

Offer terms:

  • The rounds are available only on the game: Eye of Horus;
  • The bonus comes with a wagering requirement of 40, while the extra spins have no wagering requirements;
  • Each round is valued at £0.10;
  • The minimum deposit is £10.

Assitance for this promotion:

Go to the Coral casino website and press the ‘Join’ button. Then, fill in your personal details, like name, address, phone number, username or password of choice. In order to be able to access your account, you must perform a KYC check. This means that you will have to upload the requested documents to be verified by the Coral casino team. After that, you can claim your offer!

Claim your bonus and gamble responsibly!

Maestro MasterCard Visa
18+. New customers only. Min spend £10 on qualifying games. Certain deposit types excluded. £50 Bonus on selected games subject to 40x wager req. Free Spins for selected game only value 10p each. Must accept within 7 days, valid for 30 days. Player restrictions and T&Cs apply T&C Apply
The Vic Casino

100% UP TO £200 + 20 EXTRA SPINS


Who owns The Vic:

This platform is owned and operated by Rank Interactive Limited, which is part of the Rank Group, an international company that operates multiple online gambling sites.

Pros: Over 600 games, three different types of support methods, minimum deposit and withdrawal of £5.

Cons: no apps for Android or iOS.

What do you get:

Upon creating an account and depositing a minimum of £20, you will get 100% up to £100 + 20 extra spins on the first deposit. For the second deposit, another bonus of 50% up to £50 + 30 free spins will be given, and the third will net you 50% up to £50 + 50 free spins.

Important information you must know:

  • The extra spins you will be getting are available only for Lucky Lady’s Charm Deluxe.
  • The bonus funds will be active in your account for 7 days.
  • In your account, the extra spins will be available for 7 days after claiming.
  • This platform has phone, email, and live chat support methods. The only downside is that the live chat is not 24/7.
  • There are multiple software developers here, including big names such NetEnt or Microgaming.
  • When it comes to interface and user friendlies, this website is well made with no bugs or errors.


MasterCard PayPal Paysafecard Visa
Welcome bonus package on first 3 deposits 1st Dep. Min £20. 50x wagering (bonus & deposit). max bonus to cash 5x. 20 Free spins. 35x wagering. Max bonus to cash £30. Claim once. See full T&Cs for 2nd & 3rd Deposit offers. T&C Apply
Lucky VIP

100% MATCH UP TO £555


What you will get:

Making an account on this website, then following that up with a deposit, will net you a 100% match to your deposit, going upwards of £555 alongside 1 spin on the Wheel of Wins.

How to get it:

  • Visit the website.
  • Make the first deposit of £20 or more.
  • It will be matched up automatically by the casino.
  • That is it!

Extra essential details on the promotion:

  • Besides the match up, you will get a spin on the exclusive Wheel of Wins which can give up to £50.
  • Earnings will be paid out in bonus funds.
  • The bonus will be activated after having wagered the deposited funds once.
  • It is also possible to use both real and bonus funds on this promotion.
  • Withdrawing the deposited amount before completing the rollover is possible, but this will forfeit the bonus.
  • You will also have to verify your account before using this offer.

For additional information, read through the promotional terms that come with this offer.

Maestro MasterCard PayPal Paysafecard Visa
Min. 1st dep. of £20 and above. Max bonus £555 on selected slots; 50x wagering on the sum of deposit & bonus applies. Prize Wheel: Max possible bonus £50, valid 7 days, bonus & wins playable on All slots except bonus excluded games, 20xWR. Max convertible to real is 5x bonus amount received. T&C Apply
Code: CASA10 Copied !

Betfair Review




How You may Start:

When you deposit and wager £10, you receive £30 Betfair bonus credit, and 100 rounds playable on Kingdoms Rise: Sands Of Fury, Forbidden Forest, and Guardians of the Abyss.

How to Proceed:

Use the CASA10 code while registering, and complete necessary verifications. Deposit £10. You will then have £30 in your bonus balance and receive 50 rounds. You get the remaining rotations the next day.

Some More Information:

  • The maximum stake allowed while having this promotion activated is £5. All spins amount to 0.10p each.
  • Wager the bonus amount 35 times within seven days, on eligible games. Spins expire after 24 hours.
  • Not all games are eligible, nor do they have the same playthrough contribution. Check the promotional terms.
  • Bets will first use your first deposit money. Only once this is depleted, do your wagers utilise bonus funds.
  • You may activate multiple promotions, although these enter a queue, as you must complete the first one’s rollover.
  • The most you can convert from the bonus is £500.
  • There’s a lot more to find out on Betfair’s casino website. We advise you to visit it and read the terms before opting in.
Visa MasterCard PayPal Neteller Skrill Moneybookers Solo
New Casino Customers Only. Free Spins on selected Betfair Casino Games. Free Spins valued at 10p T&C Apply



This just in:

Players that sign up for a new account at receive 100 bonus spins on Starburst on their first deposit greater than £10.

Steps to get it rolling:

  1. Register on the site.
  2. Deposit the required amount.
  3. Receive the spins and use them before they expire.

The catch: 

  • Deposit only through debit cards; deposits via e-wallets will not count for this deal.
  • Spins have a 5 days validity period.
  • Winnings generated through the bonus rounds must be wagered 35x.
  • Wagering example: suppose you generate winnings amounting to £50, then you must wager 35x £50 = £1250 to cash out;
  • The amount that you may transfer to your real balance after you meet the wagering condition will not be greater than £100.

Visit the casino and read the Terms attentively before you start exploring the games.

MasterCard Paysafecard Trustly Visa
UK residents only.Deposits made via e-wallets are not valid for this promo.Min deposit £10.Spins are valid only on Starburst and expire in 5 days. 35x wagering applies.Winnings from bonuses are capped at £100 T&C Apply
Electric Spins Casino
Code: NEW5 Copied !

Electric Spins Casino Review




What you can access:

If you’re a new player at Electric Spins Casino, you may redeem a 100% up to £30 bonus upon your first deposit, plus 50 spins.

How to claim:

  1. Press our promotional button
  2. Complete the registration form
  3. Deposit more than £5 using the code NEW5.

Remember the following:

  • This promotion can only be claimed once by new members
  • The bonus funds should be wagered 60 times and the spin winnings 40 times
  • The maximum amount you may cash out is £100 plus the initial bonus amount and £5 from the spins
  • Unused spins will expire within 7 days after being granted.

We recommend checking out the casino’s full terms for more information about this promotion!

MasterCard PayPal Visa
First-time depositors only (18+ country restrictions apply). Min deposit: £5. Max offer: 100% Games Bonus up to £30 & 50 Free Spins (on a game of our choice). Promo code: NEW5. Any Games Bonus winnings, if applicable, must be wagered 60x before withdrawal. Any Free Spins winnings, if applicable, will be credited as bonus funds and capped at £5.00. FS are valid for 7 days and any winnings must be wagered 40x before withdrawal. Games Bonus win cap: £100 + original bonus amount. Wagering contribution varies by game. We reserve the right to deny bonuses based on abusive bonus activity across sites operated by the Company. Deposit balance is available for withdrawal at any time (UK only). General withdrawal restrictions & full T&Cs apply. Valid until 31/12/2022 T&C Apply



What the offer looks like:

Signing up with PeachyGames means you may claim a 100% up to £50 match promotion. Along with it will come 20 bonus rounds to use on Book of Dead.

The redemption process:

  • Join PeachyGames from our website;
  • Create a new account and verify it;
  • Deposit £20;
  • Claim your bonus.

What to know before you go:

Both the promotional funds and spins come with 40x wagering requirements. The match offer will expire in 30 days, while the extra turns are available for 2 days since you activated them. What’s more, you cannot withdraw over £250 from wagering your bonus balance.

Extra details are available on the casino’s Terms and Conditions page.

MasterCard Trustly Visa Maestro
New players only. 100% bonus on first deposit up to £50 & 20 Bonus Spins. Bonus spins are credited immediately and are valid for Book of Dead slot only. Min first deposit of £20. Max bonus £50. Max bonus bet £5. Max bonus cash-out £250. 40x wagering requirements. Bonus expiry 30 days. Bonus spins expiry 2 days. Game restrictions apply accepted countries: UK only T&C Apply
ZetBet Casino
New casino

ZetBet Casino Review


100% UP TO £200 BONUS + 100 EXTRA SPINS


What the offer is about:

If you made an account on this gambling website and placed your first deposit of at least £20, you are entitled to get up to £200 in bonus funds, plus 100 extra spins thrown into the mix.

How to get:

  1. Go to the website by clicking our button
  2. Create an account
  3. Make a deposit of more than £20.

Other details you should know:

  • Closing the pop-up that initially prompts the bonus after registering will not remove the bonus entirely, and you can get it later
  • The bonus has to be completely wagered in a maximum of 21 days, otherwise, it will expire
  • You can contact the customer support team to withdraw the initial deposit used to get this bonus, but this will remove any earnings and the bonus itself
  • The maximum you can withdraw after using the extra spins cannot surpass £100.

For additional information, please read the terms and conditions found on the website!

MasterCard PayPal Paysafecard Skrill Moneybookers Trustly Visa
New depositing players only. Min. deposit £10. Bonuses that require deposit, have to be wagered 35x. This offer is available to players residing in United Kingdom only T&C Apply
QuinnBet Casino
Code: FREESPINS Copied !

QuinnBet Casino Review




What will you get:

After you register, deposit and wager £10, you will get 50 extra spins on the Reel Diamonds slot.

Important information you must consider:

  • Remember that the extra spins will be available for 7 days after they have been delivered to your account.
  • The round will be given at 4 PM the day after qualifying to receive the promotion.
  • Each of the 50 extra spins that you will get has a value that’s worth £0.10.
  • To be able to claim this offer, you must enter the code FREESPINS during the account creation process.

How can you claim the bonus:

  1. Create an account by walking through the registration process.
  2. Make a deposit of at least £10.
  3. Wager £10.
  4. Claim the spins.

For more relevant information, we suggest you go and read the website’s Terms and Conditions page. Also, remember that to enhance your betting experience and stay safe, you must play responsibly.

Maestro MasterCard Skrill Moneybookers Visa Visa Electron
New Players Only. Min. Deposit £10. Spins Available on Reel Diamonds. Value per spin is £0.10. Winnings are paid to cash balance. Use code 'FREESPINS' on registration. Spins will be credited at 4pm on the day following deposit. 7-day expiration date T&C Apply



The available promotion:

As soon as you join VoodooDreams, you may redeem a 100% up to £50 incentive and 50 extra rounds on Book of Dead. This offer is linked only to your first deposit on the site.

What you must do to claim it:

  1. Hit our promotional button;
  2. Complete the registration form;
  3. Deposit an amount exceeding £20.

Remember these rules:

  • The spins have no wagering requirements;
  • The play-through condition for the bonus funds is 30x deposit+bonus;
  • Games contribute differently towards meeting the requirements;
  • The maximum bet you can place with the bonus is £2;
  • The maximum cashout for the bonus funds is £500.

Feel free to check VoodooDreams’ terms and conditions for further details concerning this offer, and don’t forget to play responsibly!

ecoPayz MasterCard MuchBetter Neteller PayPal Paysafecard
New players only. Maximum £50 bonus. Minimum deposit: £20. Bonus wins are capped at £500. Max bet with active bonus: £2. Wagering requirement 100% match deposit bonus: 30 times sum of deposit + bonus. Winnings from Free Spins are credited as Real Money without wagering requirements. Some games may not be played with an active bonus. Games may contribute differently when wagering a bonus. Bonus expires after 30 days if wagering requirement has not been met. One bonus allowed per person, address, device, IP T&C Apply
Luckster Casino
New casino

Luckster Casino Review


100% UP TO £50+100 EXTRA SPINS


What’s up with this website: 

This online platform is owned by Marketplay LTD, but the website is operated by Aspire Global LTD. The latter is a company specialised is creating and operating online casinos worldwide.

Pros: over 1000 slots, more than 180 live games, useful live chat team.

Cons: monthly withdrawal limit of £7000.

What’s the offer: 

This offer extends over 3 consecutive deposits, each with its own bonus value. The first deposit will get you 100% up to a maximum of £50 alongside 20 spins on Starburst. Each day after the first deposit was made, UK players will receive 20 spins every 4 days. Each set of extra rounds is available on the following games in the subsequent order: Finn and the Swirly, Book of Dead, VIP Black,  Aloha! Cluster Pays.

Additionally, the second and third deposits will give players 50% up to a maximum of £75 to gamblers that make a payment of at least £20.

Take into consideration:

  • The maximum allowed bet with bonus funds is limited to £4 or 15% of the total received amount; using Skrill, the maximum wager will be set to £2.5.
  • This website has a straightforward interface that allows easy navigation.
  • There are a total of six payment methods available including PayPal, Visa, MasterCard and more.
MasterCard PayPal Paysafecard Skrill Moneybookers Trustly Visa
Wagering First deposit bonus: 35x bonus, Free spins on deposit: 35x winnings T&C Apply

100% UP TO £50 + 25 EXTRA SPINS


The offer:

Receive 100% up to 50 and 25 extra spins.

Keep in mind:

  • Use the bonus funds and extra spins within 30 days;
  • The highest bet is 10% of the bonus amount.

How to claim:

  1. Push the visit button nearby;
  2. Sign-up and deposit;
  3. Claim the bonus.

If you go ahead to claim the bonus, reserve a couple of minutes to register!

MasterCard PayPal Trustly Visa
First Deposit Only. Min. deposit: £10, max. Bonus £50. Game: Wild Toro, Spin Value: £0.2. WR of 30x Deposit + Bonus amount and 60x Free Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings and bonus amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos T&C Apply
Mega Casino



What is the offer:

After you register on this website and make a deposit, you will get a matched bonus of 111% up to £111 and 66 extra spins on Starburst.

Acknowledge that:

  • UK players must know that the deposit funds must not be used before claiming the bonus to avoid the offer from being voided.
  • You can bet a total of £5 or 10% of the bonus funds. Whichever is the lowest, that is the maximum value that you can bet on one single wager.
  • Each spin will be worth £0.10.
  • The website will void the bonus funds and extra spins if you didn’t use them for a maximum of 30 days.

How to redeem:

  • Connect to the platform through our website.
  • Complete the registration process.
  • Make a deposit of a minimum of £20.
  • Claim the promotion.

To learn more about this promotion, visit the website’s Terms and Conditions page and remember to always play responsibly.

Direct Bank Transfer ecoPayz Fast Bank Transfer Instant Banking Citadel MasterCard Neteller
First deposit only. Min. deposit: £20.Max. Bonus £111. WR of 30x Deposit+Bonus amount (Slots count 100%, other games 10%) within 30 days .Spins Game: Starburst. Max Spins:66. WR 60x free spin winnings amount (only Slots count) within 30 days. Spin value: £0.10.. Max bet is 10% (min £0.10) of the Bonus amount or £5 (lowest amount applies). Bonus must be claimed before using deposited funds. First deposit bonus can only be claimed once every 72 hr across all casinos T&C Apply
Buzz Bingo



What you obtain:

200 Bonus Spins with 10 points per spin on Fishin’ Frenzy The Big Catch Jackpot King.

Important details:

  • When you are using bonus rounds, you cannot obtain any jackpot.
  • By staking an extra £10 on Bingo, you will be offered extra rounds.
  • Any profits will be paid out as real money.
  • The first deposit bonus does not combine with any other offer.

How to get the bonus:

1st step: Press the visit button from our page.

2nd step: Create an account with GBP (£) as currency.

3rd step: Place the required amount into your principal balance.

4th step: Stake at least £10 on Fishin’ Frenzy The Big Catch Jackpot King.

If you want to obtain this offer, you know what to do!

MasterCard PayPal Paysafecard Visa
The Legal Stuff: New players. Deposit, stake £10 Bingo get £30 bonus (x4 WR) & £10 Club voucher, or dep, stake £10 slots get 200 x 10p Fishin’ Frenzy™ The Big Catch Jackpot King™ spins (x20 WR) & £5 Club slots voucher. OR use cash balance/further deposit & get both. £5 min. withdrawal. T&C Apply
Lord Ping



The platform will offer you:

A bonus of 109% up to £109 and 69 extra spins on Starburst after completing the registration process and making a deposit.

Keep in mind that:

  • Your maximum bet that you can place with the bonus funds is the lowest value between £5 and 10% of the bonus amount.
  • Each spin on the Starburst slot will be worth £0.10.
  • Your deposits must not be used before claiming the bonus otherwise, the promotion will be disabled.
  • From the moment you claimed the offer, you have 30 days to use it before it is voided.

How can you acquire it:

  • Visit the platform’s website using the Play button available here.
  • Create an account and make a deposit of at least £20.
  • Claim the bonus funds alongside the extra spins.

If you want to know more about this promotion, go to the website’s Terms and Conditions. Remember to play responsibly to keep your gaming habits healthy.

MasterCard PayPal Trustly Visa
First deposit only. Min. deposit: £20.Max. Bonus £109. WR of 30x Deposit+Bonus amount (Slots count 100%, other games 10%) within 30 days .Spins Game: Starburst. Max Spins:69 . WR 60x free spin winnings amount (only Slots count) within 30 days. Spin value: £0.10.. Max bet is 10% (min £0.10) of the Bonus amount or £5 (lowest amount applies). Bonus must be claimed before using deposited funds. First deposit bonus can only be claimed once every 72 hr across all casinos T&C Apply

How do we test online slot sites?

How do we test online slot sites

Transparency is a key part of our review process. To stay true to ourselves, we present in detail how we work for UK players.

The UKGC mainly focuses on:

  • Providing responsible tools
  • Pre-empting minor gambling
  • Offering an overall reliable experience
  • General prerequisites for safe play at a casino.

Step 1: It all starts with a valid licence

Step 1 It all starts with a valid licence

The United Kingdom Gambling Commission guarantees the UK slot sites follow strict legislation. The terms are fair, the games are not pressuring you to play too fast, you have access to responsible tools, and your overall time spent there is positive.


The United Kingdom Gambling Commission always prevents minors from gambling. Thus, your children will be protected too.

Most top online casinos with a UKGC licence are also vetted by independent third-party auditors.

We will look for online slots sites in 2022 that have seals from:

  • eCOGRA
  • Gaming Labs
  • iTechLabs

Those add a layer of safety regarding the software and engineering of the games we have no way of testing ourselves.

Step 2. We check the RTP of slots sites

Step 2. We check the RTP of slots sites

RTPs are essential if you want to choose a site and stick to it long-term. It is a theoretical percentage that calculates your returns over 10000 rounds or even more.

That means that when it comes to short-term play, it may not change your experience that much.

Each slot game is released by the provider with an initial rate. However, online casinos can change it when they partner with the game provider.


Our mission is to check the average RTP for each casino and show it to you in our analysis, so you know the difference from theory to practice and from one casino to another.

Step 3. We dig deeper into the volatility of slots

Step 3 We dig deeper into the volatility of slots

Slot game volatility means the likelihood of the result of a spin to be widely different each time.

There are two volatility phases:

  • Low volatility – the game payout is the same range almost all the time, and the sums are never too high as compared to your bet
  • High volatility – the game payout may be significantly higher than the bet, even if the bet was quite insignificant

We can check that by going in the game’s settings. In the rare cases when that is not public in the open game, we test it for two weeks and make our own assessment.

Step 4. We never miss looking at the paylines

Step 4. We never miss looking at the paylines

Paylines are the embedded winning combinations that, when hit, will result in a winning bet.

The number of paylines must always be written in the game settings. Sometimes, the original number may be expanded in certain conditions, which fall in the special features category.


The number of paylines does not correlate with the game’s popularity. Some of the most popular slots in the UK have just 20 or 25 paylines.

Step 5. We analyse the unique features of the UK slot sites

Step 5. We analyse the unique features of the UK slot sites

Since there are thousands of games featuring different types of slot machines created yearly, the best ones need to have catchy features. We analyse them and tell you which feature is the best.

Here are the main ones:

  • Multipliers – the number of times your bet result will be multiplied randomly
  • Wilds – random symbols that appear and expand your bet
  • Scatters – random symbols that create a payline where it wasn’t

Step 6. We proceed with making bets

Step 6. We proceed with making bets

All of the settings and details are tested by us with real funds. That is the same method you would use when playing, and we need to make the same steps you do so we can be your trusted guide.

Step 7. Overall user experience on mobile & other devices

Step 7. Overall user experience on mobile & other devices

Between 80% and 90% of online gambling is nowadays done on mobile phones and sometimes mobile tablets.

Thus, we focus on those types of devices a lot when we test the best online slot sites. We can then see if there are glitches and how they might affect your sessions.

Why do we use all these testing methods?

We want to bring you the best gambling services that we confirm to be good first. We need hand-down testing, methods that are available to you and bring you the safest options.


We use objective testing and a team system to remove bias on any opinions we might have.

Top slot sites UK

Rank Operator Number of slots Slot types RTP Bet ranges
#1 NetBet +2000 Original, Jackpots, Megaways, 96% £0.10 – £50
#2 Vegas Hero +2000 Must fall jackpots, Video slots, Jackpots, Classic slots, Online slots 95.5% £0.10 – £100
#3 BetVictor +1500 New, Original, Megaways, Drops & Wins, Instant Wins, Jackpots, Daily Jackpots 95.8% £0.10 – £150
#4 777 +1200 Classic, jackpots, Low volatility, High volatility, In-house slots 96.6% £0.10 – £1000
#5 Paddy Power Games +700 Classic slots, Daily jackpots, jackpot kings, Megaways, jackpots 95% £0.10 – £250

Rating scale used

As you can see, we only select casinos that are well-renowned casino operators in the UK. From their overall features, we selected game variety of hundreds of games or more because we know how important variety is. This is why added casinos that have multiple categories involved. Then, we look at the possible return in time and picked sites with a significant bet range from the smallest to the largest allowed.

Best online slot sites

Let’s go through a rundown of the top 5 best slot sites UK together and see their worth.

NetBet – a 4.6/5 star slot site

NetBet – a 4.6 5 star slot site

  • The lobby allows users to use filters and get detailed groups of games
  • Most of the popular slot games are found in the lobby
  • The site provides you with small pieces of content that are informative about your preferred slot games
  • You can see a full list of providers, which not all casinos do, by pushing a special button in the lobby

Vegas Hero – 4.7/5 star slot site

Vegas Hero – 4.7 5 star slot site

  • Vegas Hero is part of our NetEnt casinos and Evolution casinos compilations
  • You can see groups of slots from certain providers by clicking one button
  • The site is very intuitive and has a simple design that translates well to mobile
  • They have received a perfect score from us in terms of customer support

BetVictor – 4.7/5 star pick of online slot sites

BetVictor – 4.7 5 star pick of online slot sites

  • The have multiple slot categories that we know are attractive, including Slingo
  • The constantly rotate games in the Features & BetVictor picks tabs
  • Jackpot sums are written underneath each game thumbnail
  • We gave the site a perfect rating for games and customer support

777 – 4.6/5 star casino UK slot site

777 – 4.6 5 star casino UK slot site

  • We found dozens of popular titles when we investigated the casino for our review
  • 777 has in-house games, meaning these exclusive games are only accesible there
  • There is a vintage inspired interface that some players prefer
  • There is a constant “Top 10 in the United Kingdom” game selection on the front page

Paddy Power Games – 4.5/5 star top slot site

Paddy Power Games – 4.5 5 star top slot site

  • We rated the site high on the game spectrum and responsible games sections
  • There are exclusive games only live on the site
  • The casino’s teams picks games that are featured for a little while
  • There is a hefty informational text before the page’s footer that gives you definitions and recommendation

New slots sites UK

Rank Operator Number of slots Slot types RTP Year of release
#1 Barz +1200 Slots, Megaways, Sticky Wilds, Must go jackpots, Drops & Wins 96.4% 2021
#2 WatchMySpin Casino +900 Videoslots, Jackpots, Megaways 95% 2021
#3 Spin Rio +830 Classic slots, Jackpots 97% 2021

Top 3 new slot sites ranking explained

We start from a baseline of high standards for new casinos in 2022, to be sure they reach our safety and playing standards. The rest is quite similar to any casino review we create, we look at game variety through total number and game categories. Then, we look at the game fairness and slot features, particularly RTP since we know your interest in gambling returns.

New slots sites 2022 rated & reviewed

All of the casinos mentioned by us are thoroughly detailed, but here’s a preview for each of the 3 brands that are new top slot sites.

Barz – 4.6/5 star of the best slot sites

Barz – 4.6 5 star of the best slot sites

  • We’ve identified around 100 software provider partnerships with the casino
  • The bonuses and customer support sections have a high mark from our reviewers
  • The user experience and the theme combine well and are not invasive
  • There’s a permanent Sticky Wilds category that is popular among UK gamblers

WatchMySpin Casino – 4.4/4 star new slot site

WatchMySpin Casino – 4.4 4 star new slot site

  • Demo play is allowed after completing KYC, as per the UKGC procedure
  • The mobile system is fully optimised and it can be paired with mobile payments like any Pay by phone casino or Boku casino
  • They are transparent about their full usage of RNG systems to derive game results
  • Very simple and intuitive design for easy usability

Spin Rio – 4.4/5 star pick in our list of slot sites

Spin Rio – 4.4 5 star pick in our list of slot sites

  • The site excels in the games and responsible games category by our reviewers
  • There are 50 providers found in the lobby
  • You can find pop culture themed games here, which are quite popular
  • Useful FAQ section in the bottom of the front page

Best online casino slots

Slot RTP Bet range Volatility Best feature
Starburst 96.06% £0.10 – £100 Low Both ways win
Book of Dead 94.25% £0.10 – £100 Low Expanding symbol brings free spins
Immortal Romance 96.86% £0.30 – £30 High 234 paylines

Why are these the most popular?

We’ve primarily taken into account player needs through extracting data of searches on our site. We know these are always trending. Then, we look at the bet ranges and look at the way they can suitably fit any budget for any UK player. This ties to any hypothetical return of the RTP.

Starburst – an online casino slot best for beginners

Starburst – an online casino slot best for beginners

  • The graphics are very attractive and are layered by a 5×3 grid
  • The average RTP is quite high and it pairs well with the low volatility
  • It is created by a well-known provider and has had solid popularity since its release in 2012
  • There are not too many symbols to confuse a beginner, just Wilds.


We have devised a a guide with casino tips for beginners so you can be informed first and play real funds afterwards.


For a more personalised session on this game alone, CasinoAlpha’s authors have created pages for Starburst casinos and for singular Starburst free spins promotions.

Book of Dead – one of the top slots online

Book of Dead – one of the top slots online

  • It has an Ancient Egypt thematic which is widely attractive to gambling users from the UK
  • The bet limits are quite accepting of both casual and high-rolling sessions
  • It has a classic payline number, totalling to 10.
  • It contains multiple special features, like Wilds, Scatters, Multipliers, Free Spins, and the Gamble Feature.

Popularity is proven already

To cater to UK players’ needs in the best we can, we have shown them the best-rated Book of Dead casinos and allowed them to pick Book of Dead free spins no deposit UK offers at any time.

Immortal Romance – high volatility best online slot pick

Immortal Romance – high volatility best online slot pick

  • Obviously, the most eye-catching feature it has is the high number of possible paylines.
  • The most one can win is 12000 times the original bet.
  • Some special features are unlocked during the game, so there are layers to a play.
  • Each symbol, or a game character, may influence the end of a round.

Top slots online with jackpots

Slot Provider Highest paid result Best feature
Mega Moolah Microgaming £15 billion Progressive & Multiplier features
Mega Fortune NetEnt £2.19 million Bonus rounds
Cleopatra IGT £8200 Possible 10000x bet result

Best jackpots choices by us

Our choices at this point are quite intuitive. We have chosen the jackpot slot games that have accumulated the highest jackpots that worldwide players have won over the years. We also analysed what features have the highest impact on your gameplay and chose games from well-established providers.

Advice for safe jackpot play

Advice for safe jackpot play

  1. The probability that you win the jackpot is tiny. That is backed up by the lower RTP rate and how often the jackpot is won. So, don’t have any high hopes.
  2. As someone who have just learnt how to play slots online, or as player that wagers on a strict budget, we advise you to limit your sessions to under 15 minutes a day.
  3. There is a small percentage of casino bonuses based on them.
  4. Progressive jackpots slots have lower chances of winning as compared to a classic lottery ticket.

What are the best online slots to play?

  • Starburst
  • 9 Masks of Fire
  • Book of Dead
  • Book of Ra
  • Immortal Romance
  • Wolf Gold
  • Gonzo’s Quest
  • Fire Joker
  • And essentially any game that you like, as long as you exercise caution with your time and money.

Top game providers

Game provider Best slot features Most popular game Other perks
Microgaming Cluster plays Mega Moolah VR games developed
NetEnt Avalanche wins Starburst Lots of branded slot games
IGT +450 licences in different jurisdictions Cleopatra Landbased casinos
Big Time Gaming Megaways feature Bonanza Triple reaction feature that adds reels

Game providers shine the most when they are partnered with high-quality casinos. For example, some of the best casinos we have listed are top Microgaming online casinos or NetEnt casinos in the UK. They are SSL-locked, UKGC-licences, and independently reviewed sites with thousands of new users signing up daily.

While these are business-to-business collaborations of two separate entities, the best IGT casinos offer, besides their gaming palette, whitelabel solutions to online casino sites. Thus, all of the items in the category share certain similarities.

How to play slots online?

How to play slots online

Basic steps to slots play

Your first and most vital step is to know the game rules and what each symbol or feature does. That means you won’t have any surprises with the game’s functioning.

The second step is to make calculations to reach a fixed slot play budget. Once there, never exceed it.


CasinoAlpha’s perfect budget formula is to first figure out your pocket money monthly, after bills, and your savings accounts. Out of that sum, 10% can be used for gambling. We highly recommend you don’t spend more than that.

The third is to choose a casino and a game. That’s where we help you with your decisions.

The fourth step is to read the game specifications and rules once you launch it. Then, you can just play.

How do online slots work?

They are software that is built on complex code. Their results are based on Random Numbered Generators, so there’s no room for rigged results.

What online slots pay real money?

All of the games on UK online casinos can pay out real money if you use real funds and hit a payline.


Real funds play in the UK is tied to confirming your account and finishing KYC to prove you are of legal age and your payment services are legitimately yours.

How to pick a UK slot site & sign up?

How to pick a UK slot site & sign up

  1. Use CasinoAlpha’s database which is updated monthly.
  2. Find a site with ratings above 3.5 stars out of 5 total.
  3. Read our review and bonus descriptions to get familiar with what they offer.
  4. Sign up using their instructions.
  5. Complete KYC as fast as possible so you waste less time while engaged in transactions.
  6. Play safely and respect the Terms and Conditions attached!

Bonuses compatible with slots

Bonus type Best feature Tips Find it here
Free rounds Budget-friendly Calculate the bonus value by multiplying the spin value by the number of spins received Free spins no deposit required
Payment-free bonuses Allows to explore without spending Use the necessary bonus code when required Free no deposit bonuses
Sign up offers Accesible with small deposits Choose bonuses that work on multiple deposits Welcome bonuses
No wagering needed Less time to cashout Use our listing to find them instead of looking for them yourself No wagering casinos

These are just a few subtypes of the best online casino bonuses that we work with daily. We know that each player can find a type that fits their needs, whether it is about slots with free spins, or live casino promotions.

Be aware

  1. Each bonus has unique terms and conditions attached. You need to stick to it and respect it, otherwise, you risk losing the bonus or the funds derived from it.
  2. Cashing out before finishing wagering, when the issue is present, is impossible and may result in you losing your bonus.


Take time between sessions and bonuses for your own mental health. Gambling excessively can turn you into a bonus hunter and have negative consequences.

Major types of slot games

Major types of slot games

Slot sites have a multi-faceted catalogue of options. We give you definitions for each major game type.

Real slot machines

These are the games found in top land-based casinos from the UK. They are activated manually through a button or an arm. Obviously, you can’t find them in online casinos, but they are the base source of the game we play today.

Classic slots

These are games that have a classic layout, usually with 3 rows and 5 reels. The paylines are between 10 and 25 at most, and the animations are minimalistic. They are meant to mimic the original games that were built almost a century ago.

Fruity slots

The symbols that fall and rearrange themselves are fruits, like cherries, watermelons, etc. Otherwise, the design is very much similar to classic slots. You will find symbols that represent the number 7, which is a stable symbol.


The animation, fades, music, and all the sensory elements are very modern and high-tech. There is no single theme associated, but the most encountered are adventure-based, historical, mythological, and fantasy designs.


The pot that increases or decreases while you are playing can grow in size and value when you keep playing. In certain instances, the pot increases while players are betting on multiple platforms, like Mega Moolah, for instance. Jackpot slots are a synonym for the same concept.

Megaways slots

These are slots in which the winning paylines reach numbers that go way over 10000. This is a creation of Big Time Gaming and they have, naturally, gained a lot of traction in the UK online industry.


Jackpot slots are the ones where the pot increases continually and exponentially to the bets made by one or more players that are actively playing. The terms jackpot slots and progressive slots mean similar things and can be used interchangeably.

VR slots

These are slot games designed to be played with the use of a Virtual Reality headset and additional gear. You can find them in VR casinos or in places dedicated to that medium. The game rules and layouts are not changed dramatically.

In-house slots

In-house slots are games developed by certain providers, especially for one specific casino. The site has trademarks over them and UK gamblers can only play them on those specific sites. We let you know which casinos have such exclusivities through each of our reviews.

Why play on UK slot sites?

Why play on UK slot sites

  1. They are popular and there are hundreds of them on the market.
  2. The way they develop, perform, and evolve is fast-paced and user-experience oriented.
  3. Most of them have bonuses, some of which are free of charge or free of wagering requirements.
  4. The deposits and bets you need to make can be small and protect your funds.
  5. The slot games have an easy playthrough and don’t require complex strategies or calculations.
  6. All of the casinos listed by us are licenced by the UKGC and reviewed by a competent team of casino analysts. Some of them also have authentications from third-party gaming testing agencies.
  7. They are a good option to start with for new gamblers.
  8. All of them have responsible gambling tools that limit your play or spending the way you set them up to.

Pros and Cons

  • Easy to access and use on all platforms, mobile included
  • Present a wide range of products from well-known gaming software producers
  • Have multiple bonuses available at all times
  • Usually allow many deposit and withdrawal methods
  • Have embedded responsible gambling tools that are quite efficient
  • Some may have no other game options besides slots
  • The terms may be hard to decode
  • No other perks besides the basic whitelabel products

Methodology for online slot sites UK

Methodology for online slot sites UK

It took us more than 50 hours to create this page. That is, over the 10 hours we dedicate to each individual review. Our database was our starting point and your usual gambler steps were our road map.


We will make all the necessary modifications to this page if new information is revealed by the legislation or the big competitors in the industry.

Phases of research and analysis

  1. Taking a casino and our review and doing a double-check on its facts, authenticity proof and reliability.
  2. Retaking the steps of a gambler that is looking to play online slots.
  3. Playing and paying like an average UK player.
  4. Comparing hundreds of casinos to the industry average to arrive at a temporary list.
  5. Comparing the casinos to each other to get the tops you see here.
  6. Discussing with other teammates to remove bias or the natural doses of subjectivity.


Is each reel on an online slot machine random?

Yes, as long as the game is hosted by a licensed casino and a casino with extra certifications of software standards.

Are online slot casinos legit?

Yes, they are, as long as they are licensed by the UKGC. We also verify their legitimacy.

Can I win real money while playing slots?

Yes, you can, as long as you play a bonus or use real money, and you hit a winning payline. Extra limitations are imposed and you can find them in the terms and conditions.

Which slot sites offer a free sign-up bonus?

Casinos that offer free spins or no deposit bonuses are the sites you’re looking for. We have dedicated pages for both.

How to win at online slots?

Budget well, limit your spending, and avoid the progressive slots and maximum bets.

What online slots pay real money?

All of the games on UK online casinos can pay real money when you hit a payline. You have to be engaged in bonus play or real money bets for that to occur.

What are the best online slots to play?

Book of Dead, Starburst and Immortal Romance are great choices to start with. Others include Fluffy Favourites, Book of Ra, Gonzo’s Quest, Thunderkick or the Age of Gods series.

Which online slots payout the most?

Jackpots pay out the most money, but the frequency of payout is very low. Mega Moolah is the most prominent game in that category.

How to win big on online slots?

There is no real recipe for success. Slots are not games that are notorious for big wins. Your best method is to pick a game that you learn well and be wise when you calculate your budget.
Ioana Nutulescu
Author Ioana Nutulescu Author & Editor at CasinoAlpha

Using her Comparative Literature MA, Ioana’s casino and game reviews, player guides and pages cater to the different culture-related needs, preferences, and mentalities of gamblers around the world. Focused on aesthetic & psychology, she advocates for pleasing yet safe casino experiences.

Tudor Turiceanu
Reviewer Tudor Turiceanu CEO & Chief Editor at CasinoAlpha
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