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Slot Sites

Two empty neon pink slot machines is something you won’t find at the best slot sites

Slot sites are among the most popular casino websites on the planet. 

However, because there are so many top slot websites it can be tricky knowing which are the best ones for you to invest your time and money in. 

That’s why OnlineCasinos.co.uk has reviewed all the UK’s best slot sites. 

We’ve played the games, checked the bonuses, found out what the payouts are, and assessed all the other things that you care about. 

All you need to do is read through our guide, decide what the best casinos are for you, then head over to the websites and play their great slot games.  

10 best slot sites 

  1. PlayOJO 

  2. Mr Green 

  3. bgo

  4. LeoVegas

  5. Grand Ivy

  6. 888

  7. Playzee

  8. The Sun Vegas

  9. Dream Vegas 

  10. Betway

Top slot sites reviewed by OnlineCasinos.co.uk 

  • PlayOJO 
  • Mr Green 
  • Dream Vegas
  • LeoVegas
  • Grand Ivy
  • 888
  • Playzee
  • The Sun Vegas
  • Jackpot247
  • Betway
  • Mansion
  • Casimba
  • All British 
  • GentingBet
  • Roxy Palace
  • Gala 
  • 32Red
  • Grosvenor
  • Bet365
  • Casino.com
  • bgo 

OnlineCasinos.co.uk’s expert thoughts on the 10 best slot sites

  1. PlayOJO: king of the UK’s slot sites  

  2. Mr Green: huge collection of slots games   

  3. bgo: great free spins offer 

  4. LeoVegas: combination of great payouts & lots of games  

  5. Grand Ivy: excellent variety of video slots 

  6. 888: trustworthy slot site 

  7. Playzee: outstanding loyalty programme 

  8. The Sun Vegas: exceptional new slot site 

  9. Dream Vegas: ace mix of new & classic slots

  10. Betway: ace slots games & lots more 

Gold medalist 🥇 PlayOJO: UK’s best slot site  

PlayOJO Casino is one of the best slot sites

Credit: PlayOJO Casino 

OnlineCasinos.co.uk slot sites rating ⭐⭐⭐⭐⭐

PlayOJO Casino is number one when it comes to the UK’s best slot sites. 

It has the most games, lowest wagering requirements for its bonuses, and one of the finest apps of any casino. It’s perfect for people who love to play the slots. 

Top 3 features of PlayOJO Casino: 

  • Close to 3,000 slots titles 🎰

  • No wagering requirements 💷

  • Lots of jackpot games 🤑

PlayOJO Casino is one of the finest slot sites

Credit: PlayOJO Casino  

Slots bonus package ⭐⭐⭐⭐: 50 free spins 🎰

The website is also incredibly user friendly. Indeed, you really feel like PlayOJO pulls out all the stops to make sure its new and returning players have the best time when they try their hand at its many brilliant games. 

Vist PlayOJO Casino now to find out why it’s at the top of our list of the best slot sites. 

Bonus offer terms and conditions

  • First-time depositors only. Min. deposit £10.

  • Maximum amount of Free Spins is 50.

  • Game: Book of Dead - Spin Value: £0.10 each.

  • Excluding new players in Northern Ireland.

  • OJO's Reward and Game Play Policy Applies. Read now.

  • Welcome Play Package

  • 18+

  • BeGambleAware.org

Silver medalist 🥈Mr Green: huge collection of slots games   

Mr Green Casino is one of the best slot sites

Credit: Mr Green Casino 

OnlineCasinos.co.uk slot sites rating ⭐⭐⭐⭐⭐

Mr Green has an incredible selection of games that make it the envy of most slot sites. 

It features a vast array of slots. Vegas slots, jackpots, instant wins, interactive titles, and retro options are among the many games that you can play. 

Top 3 features of Mr Green Casino: 

  • Diverse collection of slots games 🎰

  • Real Thrill slots bonus competitions 💷

  • Great blog with helpful gaming tips 📚

Mr Green Casino is one of the finest slot sites

Credit: Mr Green Casino 

Slots bonus package ⭐⭐⭐: 50 free spins 🎰

Perhaps the best thing about Mr Green is the exclusive games it offers. The site has some exceptional titles that are regularly updated and offer a gaming experience you don’t get from any other casino. 

Head over to Mr Green Casino now and start using one of the best casino sites in the world.

Bonus offer terms and conditions

When you stake £20

Opt in required per day. 1x per customer per day. Min. £20 must be staked on Starburst™. Free spins on Starburst™ only. Max. 5 free spins at £0.10/spin with 35x wagering. Bonus expires 24 hours after issue. Game weighting, game, country, currency, player restrictions and terms apply.

Terms and conditions

Bronze medalist 🥉 bgo: great free spins offer 

bgo Casino is one of the best slot sites

Credit: bgo Casino  

OnlineCasinos.co.uk slot sites rating ⭐⭐⭐⭐⭐

bgo Casino has one of the best free spins offers of all the slot sites we’ve reviewed. 

The casino gives you the chance to win up to 500 free spins once you sign up for an account. You need to deposit a minimum of £10 to be eligible for the offer and then take on the site’s Mega Wheel.

Top 3 features of bgo Casino: 

  • Daily slots tournaments 💷

  • Good selection of new slots games 🎰

  • Weekly rewards hub 💸

bgo Casino is one of the finest slot sites

Credit: bgo Casino  

Slots bonus package ⭐⭐⭐⭐⭐: 500 free spins 🎰

bgo Casino’s tournaments are one of the things that really sets it apart from the other casino sites. It holds 12 each and every week, giving you the opportunity to battle against other players to win rewards. 

Check out bgo Casino now and see for yourself why it’s one of the top slot sites in the UK. 

Bonus offer terms and conditions

UK only. win up to 500 free spins from mega wheel on 1st deposit. 24-hour expiry. Max bet £2.50, max spins win £8 per 10 spins, max bonus win £150, selected games & 65x wagering on winnings. No neteller/skrill. full T&Cs apply.

LeoVegas: combination of great payouts & lots of games 

LeoVegas is one of the best slot sites

Credit: LeoVegas 

None of the other slot sites we’ve assed match LeoVegas Casino for the combination of games and the level of payout offered to gamblers.

It features over 600 games and has an RTP of 97.60%, making it not only a fun website but one where you could earn some cash. 

This means that LeoVegas is the best option for casual betters who play for fun and more serious gamblers who want to win some money. 

Grand Ivy: excellent variety of video slots 

The Grand Ivy Casino is one of the best slot sites

Credit: The Grand Ivy Casino 

If video slots are what you look for in your slot sites then Grand Ivy Casino is perfect. 

Grand Ivy Casino has a superb range of games and its site makes it easy for you to find the ones you want. It does this by letting you filter by the software provider or name of the game. 

So, if you’re a fan of video slots then pay a visit to The Grand Ivy Casino today. 

888: trustworthy slot site 

888 Casino is one of the best slot sites

Credit: 888 Casino 

888 Casino is a slot site that’s reliable, trustworthy, and safe. 

You can be sure you’re safe when you play slots at 888 Casino because it was voted the Best Casino Operator at the 2020 Gaming Intelligence Awards and 2019 EGR Awards London.

These are awards that only truly secure casinos can win. 

Try the 888 Casino website now to see with your own eyes just how trustworthy it is. 

Playzee: outstanding loyalty programme 

Playzee Casino is one of the best slot sites

Credit: Playzee Casino

Playzee Casino is a slot site that really looks after its loyal players. 

It rewards its returning players with the Zee Club, a scheme that gives perks like unique bonuses and free spins. 

You become a member of Playzee Casino’s loyalty program as soon as you create an account. You then work your way up the ranks as you play your favourite games. 

See what Playzee Casino has to offer to learn if it can become one of your top slot sites. 

The Sun Vegas: exceptional new slot site

The Sun Vegas Casino is one of the best slot sites

Credit: The Sun Vegas Casino

The Sun Vegas Casino is one of the best new slot sites you can use in the UK. 

You can pick from over 600 brilliant slots to play and if you do decide you fancy a change then you’ll adore the site’s incredible 3D roulette offering. 

Follow the link to The Sun Vegas Casino to learn why few slot sites can compete with it. 

Dream Vegas: ace mix of new & classic slots

Dream Vegas Casino is one of the best slot sites

Credit: Dream Vegas Casino

Dream Vegas Casino is a slot site that is ideal for all types of slot fan, with its superb mix of retro games and new titles. 

Starburst and Book of Dead are among the classic slots games you can try, while Saxon and Blinged are some of the finest new titles you’ll find at any casino. 

Make your way to Dream Vegas Casino now to experience a slots site that gets its games catalogue spot on. 

Betway: ace slots games & lots more

Betway Casino is one of the best slot sites

Credit: Betway Casino

Betway Casino is one of the slot sites that goes beyond fruities and jackpots. 

Not only does it feature some brilliant slots titles, but it also has an exceptional poker offering (including a cardroom), great live gaming, and outstanding sports betting options. 

If you want a slots site that offers a bit more then try Betway Casino now. 

3 top slot sites for free spins 

Slot Site

Free Spins Rating

bgo

⭐⭐⭐⭐⭐

LeoVegas

⭐⭐⭐⭐

PlayOJO

⭐⭐⭐⭐

Every slots site worth its salt will offer free spins and we found some great offers when comparing the very best sites. 

However, there was a clear winner: bgo Casino.

 

Credit: bgo Casino

You can earn up to 5x the amount of the next highest casinos, putting it streets ahead of the competition. 

The catch is that you have to earn these spins by competing against the site’s Mega Wheel, so the amount you get depends on how well you play. 

An honourable mention goes to PlayOJO. This is because the free spins you get from the site come without wagering requirements. This means you don’t need to invest your own money to get the full benefits of the offer.

Slot site with the best free spins offer: bgo 

bgo Casino is one of the top slot sites

Credit: bgo Casino 

  • You can earn up to 500 free spins at bgo 

Bonus offer terms and conditions

UK only. win up to 500 free spins from mega wheel on 1st deposit. 24-hour expiry. Max bet £2.50, max spins win £8 per 10 spins, max bonus win £150, selected games & 65x wagering on winnings. No neteller/skrill. full T&Cs apply

3 top slot sites for free spins games

Slot Site

Games

OnlineCasinos.co.uk Rating

PlayOJO

2800

⭐⭐⭐⭐⭐

Mr Green

1694

⭐⭐⭐⭐⭐

bgo

1093

⭐⭐⭐⭐⭐

Games are one of the main reasons to head to a slot site – sure, you want to win some money but you need to place a bet on a game to do so. 

Because there are so many slot titles out there, we think it’s crucial to compare how many games are offered by the leading slots sites.

And which site has the most? PlayOJO Casino, with an enormous 2800. 

PlayOJO Casino is one of the best slot sites

Credit: PlayOJO Casino 

PlayOJO Casino’s huge games category puts it more than 1300 games ahead of second-placed Mr Green. 

This means that it was a no-brainer to pick PlayOJO as being the best slot site for games. 

Slot site with the most games: PlayOJO

PlayOJO Casino is one of the best slot sites 

Credit: PlayOJO Casino

  • PlayOJO Casino has around 2800 slot games

3 top slot sites for payout 

Slot Site

Games

OnlineCasinos.co.uk Rating

Mr Green

99.90%

⭐⭐⭐⭐⭐

Betway

98.10%

⭐⭐⭐⭐⭐

bgo

98.00%

⭐⭐⭐⭐⭐

First and foremost, playing slot games should be about one thing – having fun. 

Slot games are like every other game, you play them to be entertained and your enjoyment should begin with simply participating. 

However, like every other game, slot games do have an objective – to win. And the reward you get for winning slot games is money – your payout. 

Payouts for slot games are measured in RTP and Mr Green is the site that offers the most attractive figure, with a high-end RTP of 99.90%. 

Slot site with the highest payout: Mr Green

Mr Green Casino is one of the leading slot sites  

Credit: Mr Green Casino

  • Mr Green Casino has a high-end RTP of 99.90% for its slot games

Most popular slot games you can play

Five empty slot machines are something you won’t find at the best slot sites

Credit: Wikimedia

Games are the key to the best slots sites. They’re the reason you visit them, the things that bring you fun from your gambling sessions, and the way you can win some cash. 

The top websites offer hundreds, even thousands of slot games, and this makes it tricky to know what the best ones are. 

That’s why we’ve highlighted the five most popular slot games you can play.

Our 5 most popular slot games 

  1. Starburst 

  2. Leprechaun Hills

  3. Centurion Free Spins

  4. Game of Thrones

  5. Casper’s Mystery Mirror

Starburst 

Starburst is one of the most popular slot games you can play at slot sites

Credit: YouTube

  • Payout: 96.10%

  • Paylines: 10 

  • Jackpot: 250

  • Software provider: NetEnt

Leprechaun Hills

Leprechaun Hills is one of the most popular slot games you can play at slot sites

Credit: YouTube

  • Payout: 96.47%

  • Paylines: 40

  • Jackpot: 6

  • Software provider: Quickspin


Centurion Free Spins

Centurion Free Spins is one of the most popular slot games you can play at slot sites

Credit: YouTube

  • Payout: 95.00%

  • Paylines: 20

  • Jackpot: 500

  • Software provider: Inspired

Game of Thrones

Game of Thrones is one of the most popular slot games you can play at slot sites

Credit: YouTube

  • Payout: 94.86

  • Paylines: 243

  • Jackpot: 30

  • Software provider: Microgaming

Casper’s Mystery Mirror

Casper’s Mystery Mirror is one of the most popular slot games you can play at slot sites

Credit: YouTube

  • Payout: 95.50%

  • Paylines: 40

  • Jackpot: 500

  • Software provider: Blueprint Gaming

Why free spins are key to the top slot sites 

A row of seven empty slots machines is something you won’t see at the top slot sites

Credit: Wikipedia

Free spins are great for new gamblers who are deciding what slot sites they want to sign up to – they give you a chance to try out games without paying a penny. 

While free spins might sound like a great deal (and in many ways they are) they do come with some conditions that you need to be aware of:

  • Free spins are generally for specific slots games 

  • Free spins can be dished out in daily doses – not all at once

  • Free spins often have a time limit on them 

And the thing to note is that free spins only apply to new gamblers. This means that if you’ve already signed up to a slots site you are no longer eligible to get its free spins offer.

What is RTP & how does it work for slot games? 

A lady with dark hair sits in front of a slot machine

Credit: Flickr

It’s important to think about the payouts you're getting from the casino sites you bet at. 

This is because it’s not a lot of fun if you don’t win the games you play and having fun should always be the priority when you’re playing the slots. 

How do you measure the payout in slots? By the RTP (return to player). Here’s an example of how that works:

If a slot site has an RTP of 99.99%, this means that £99.99 of every £100 wagered is returned to players in the long run. 

But, continuing with the example, what you need to know about RTP is that just because you spend £100 it doesn’t mean that you’ll get £99.99 back. 

This is because the RTP of a slot site covers every player and every bet placed – and some bets win and some lose. 

Top slot sites for mobile gambling 

A woman holds a black smartphone in her right hand and uses it to play games at the best slot sites

Credit: Pexels

Mobile gambling is something that gamblers expect from slot sites – with more internet traffic coming via mobile than desktop, gambling websites need to have a mobile offering to be truly online.  

Unsurprisingly, pretty much every slot site we compared has an app. 

The apps created by slot sites replicate their website offering as closely as possible, with many being a mirror version of the site – for example, the number of games is often near-identical when comparing the app and website. 

A smartphone is held in a person's left hand with the right used to keep it steady

Credit: Pixabay

Because the mobile and online offering is so similar, this means the apps of slot sites must be judged on something different – how easy they are to use. 

Many of the slot sites we reviewed have apps that are a breeze to use, honourable mentions going to: 

  • LeoVegas

  • 32Red

  • Mr Green 

  • Betway

  • PlayOJO 

Of these, one slot site stood out above the rest: PlayOJO Casino

We think that PlayOJO Casino has the best app of all the slot sites we compared, but that’s not the only reason we think it’s great for gamblers – it also has some great roulette, poker, blackjack, and (of course) slot games. 

You can learn about all the reasons we think it’s a top slot site by reading our full review of PlayOJO Casino.

How OnlineCasinos.co.uk reviews the best slot sites

Five empty neon slot machines is something you won’t find at the top slot sites

Credit: Pikist

OnlineCasinos.co.uk is a team of gambling enthusiasts who love to play casino games. 

This means that we want the same things that you do from the slot sites we bet at: 

  • Great games

  • Real bonuses

  • Competitive payouts

  • Safe and user-friendly site

  • Brilliant app

We begin by looking for gambling regulatory icons on websites, so that we know that the site can be trusted to look after your sensitive data. 

Once we know a site is trustworthy, we check to see how many games you can play on both the website and app. And we play the games too, so that we can be sure that you’ll get a great experience from the slot sites we’ve recommended. 

We’re very proud of our review process. Not just because we spend huge amounts of time testing the casinos and detailing our thoughts, but because we know that we’re recommending great slot sites to our fellow players – that’s you. 

What are the different sort of slots that I can play?

Three slot machines set against a red backdrop

Credit: Pikrepo

The top slot sites have hundreds, even thousands of different games you can play. 

Video and retro slots are often the most popular slot titles at these sites. However, they aren’t the only options available to you because there’s a selection of different slots you can play. 

These are the key slots you can choose: 

Progressive jackpot slots 

PlayOJO Casino has lots of great slot games

Credit: PlayOJO Casino

Progressive slots increase in value each time you wager some money on them. This means that you have the potential to really boost your winnings. 

One thing to note about progressive slots is that they’re often highly volatile. 

So, while you can earn larger wins from these games, you can find that you need to make lots of bets before getting close to the jackpot. 

Real money slots 

LeoVegas Casino has lots of great slot games

Credit: LeoVegas Casino

Real money slots are games that you play for your own money, they’re the ones that give you a chance to earn some actual cash. 

Because you’re investing your own cash on these games you’ll need to manage your bankroll carefully, to make sure you don’t spend more than you can afford to. 

It’s a great idea to set a limit before you play. That way you know exactly what your limits are and it's easier to stick to them. 

Free slots 

Mr Green Casino has lots of great slot games

Credit: Mr Green Casino

Free slots are games you can play without spending any money, making them ideal for testing your skills before wagering your cash. 

Many slot sites offer free versions of their real money slot games. 

While each casino is different, you’ll often find the free version of the game advertised next to the real money one – there will generally be a button that says something like “play for free”.

Retro slots

bgo Casino has lots of great slot games

Credit: bgo Casino

Retro slots are the classic games you’ll find at casinos. 

You’ll be able to spot these slots because they are designed to look like the classic fruity machine games that are used in land casinos. 

Retro slots also generally use three or five reels and one payline. This makes them simpler to play and means that they’re ideal for new players. 

Video slots 

The Sun Vegas Casino has lots of great slot games

Credit: The Sun Vegas Casino

Video slots are the most popular games you’ll find at most casinos, particularly ones that specialise in slots. 

Video slots are incredibly varied, offering a range of reels and paylines, along with a broad range of themes. 

Some of the themes you can expect to find include films and TV shows, games, and fantasy. 

What are the best slot games providers?

A Matrix-style image with a man in black sunglasses behind green computer code

Credit: Max Pixel 

The best slot sites feature games from a huge range of providers, with some of these casinos using over 30 different software companies to supply their slots titles. 

While there are many great providers, there are a few industry leaders you should look for. 

3 top slot game providers 

  • Playtech 

  • Microgaming 

  • NetEnt 

We’ve assessed each of these great slots games providers in our casino software review

It lists some of the top games made by each of these companies, so you can get some tips before you visit your favourite slot sites. 

How can I find a safe slot site?

Five rustic looking casino slots machines with empty chairs in front of them

Credit: PeakPX

The first thing any gambler should expect from the top slot sites is that they are able to have fun. The next thing they demand is that the site is safe.

You can confirm that you’re gambling at a safe website by looking for the icons of licensing and legislation organisations.  

Any slot site that operates in the UK has to be regulated by certain gambling organisations and national authorities, even those that are registered outside of the UK – like in Sweden, Malta, or Gibraltar. 

Slot sites want their players to know that they’re safe to use and the way they confirm this is by putting the icons of gambling regulators on their websites. There are some key icons you need to look for and these are the most important ones. 

Gambling organisation icons to look for at slot sites 

UK Gambling Commission  

Look for the UK Gambling Commission logo on slot sites.

Credit: Gambling Commission 

Any slot site that is allowed to operate in the UK is ultimately regulated by the UK gambling commission. 

Government of Gibraltar  

Look for the Government of Gibraltar logo when you use slot sites

 

Credit: Wikipedia

If a slot site is licensed in Gibraltar then you’ll know this to be the case by the Government of Gibraltar logo on its website. 

Malta Gaming Authority 

Look for the Malta Gaming Authority logo when you use slot sites

Credit: Malta Gaming Authority

If a slot site is licensed in Malta somewhere on its website you’ll be able to find the logo of the Malta Gaming Authority. 

Spelinspektionen

Look for the Malta Gaming Authority logo when you use slot sites

Credit: Spelinspektionen 

You’ll know if a slot site is licensed (or able to operate) in Sweden because the Spelinspektionen logo will be displayed on its website. 

Responsible gambling icons to look for at slot sites 

We’ve been clear that fun is the main reason you should gamble and you should never lose sight of this, rather than focussing on whether you win or lose – even the best gamblers can lose and even the worst ones can win. 

How you measure fun is up to you. 

You might decide that fun looks like lots of brightly coloured slots, or you might decide that it looks like a slot game with a competitive RTP. But the key is that you gamble responsibly

Slot sites want their gamblers to know that they have a commitment to responsible gambling and they do this by putting the icons of relevant organisations on their websites. 

These are the responsible gambling icons you should look out for on slot sites:

GamCare

Look for the GamCare logo when you use slot sites

Credit: GamCare

GamCare is a UK charity that offers support to people who believe they have a problem with gambling. It’s an organisation that people can speak to and seek the support that they need. 

GAMSTOP

Look for the GAMSTOP logo when you use slot sites

Credit: GAMSTOP

GAMSTOP is a self-exclusion organisation that allows gamblers to block themselves from slot sites and other betting websites. 

People can contact GAMSTOP and register their intent to self-exclude from a specific site for a set amount of time. This means that during this timespan the person will be blocked from using that site by the site itself – it’s like they have a temporary ban. 

You can contact GAMSTOP to find out if your preferred slot sites offer self-exclusion.

FAQs

What is the best online slot site for gamblers? 

There are many different slot sites and the best one could be different for each gambler. However, we believe that PlayOJO Casino is the best slot site for gamblers.

This is because PlayOJO has the most games of all the slot sites we reviewed. 

Can you play slots online for real money?

There’s an enormous number of slot sites that allow you to play real money slot games. In fact, most of the slot sites you find will be real money ones. 

All you need to do to know if real money games are available is to head to the slot games section, where it will confirm if you can make cash bets. 

Is it safe to play online slot games? 

Slot sites are regulated by gambling organisations. This means that they need to abide by strict rules and laws, otherwise they won’t be able to operate. 

Because of this, you can feel safe when you’re playing online slot games. 

One thing to remember is that playing slots for real money means that you’ll be spending your own cash. This poses the risk of you betting more money than you can afford. 

To help stay safe when playing online slot games, set yourself a spending limit and time allowance. This will help to keep you from investing more time and money on slots than is safe for you to do. 

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