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Best Online Slots ᐈ Ranked by popularity in UK

Looking for the best Slots of all time? We rank online slots by their exposure in Casinos ➤ Game info & Stats ✔️ Reviews ✚ Bonuses.

The best online slots ranked by popularity

United Kingdom

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Game releases by month for the last 10 years. Please be aware that we have set up approximate release dates for some games. Filters apply.

The top 5 games ordered by the lowest average lobby position for the United Kingdom market. Filters apply.

The Best Online Slots

In this section you’ll find our always up-to-date list of the top ranked online slot machines. We provide unique and distinct lists for all different regions, and the ranking system is based on data collected from more than thousand online casinos.

If you want to see the top 100 slot ranking for another region, all you have to do is change the language in the drop down menu in the top right corner of the page. Our ranking system is based on exposure, and by that we mean the average lobby position each slot has across all the casinos we sample.

We hope you find this information useful, and you can always click on any game to get the full details and ranking calculations. We also provide all available technical data for each slot, and you can read our full slot review and play each game for free right here at SlotCatalog.

Top 10 Best Online Slots

1. Starburst from NetEnt

Starburst is one of NetEnt`s most famous slots, and it rose to stardom soon after it was launched back in 2012. It`s a timeless classic that remains as relevant and fun today, as it was when it was first released. Starburst is among the most popular slots you`ll find online, and not seldom it`s the assigned slot for free spins promos and welcome offer free spins.

2. Big Bass Splash from Reel Kingdom

Big Bass Splash is another volatile installment in the fishing slot genre from Reel Kingdom, and it plays out on 5x3 reels with 10 paylines. It’s once again all about the reel ‘em bonus round, where cash fish are collected by the fisherman wild who is himself collected to upgrade the multiplier and award extra spins. A pre-feature upgrade game awards up to 5 extras. The 5,000x potential is the highest so far, and you can check our full review below the demo game.

3. Big Bass Bonanza from Reel Kingdom

Big Bass Bonanza is a Reel Kingdom fishing expedition video slot, and it plays out on 5 reels, 3 rows and 10 win ways. It’s all about catching those fish prizes with the fisherman wild, and the wilds are also collected to increase the multiplier and give you extra spins. The max win is capped at 2,100x your stake, and the volatility is pretty high.

4. Dynamite Riches Megaways from Red Tiger

Dynamite Riches Megaways is the volatile, dynamic reels follow-up to the popular mining slot from Red Tiger, and it plays out on 6 reels with up to 117,649 win ways. You’ll collect wilds to unlock 4 different modifiers, and the bonus round now comes with a multiplier that increases per win up to x20 at the most. This can lead to payouts up to 7,000x your stake, and you can read our full review and test the demo game below.

5. Fluffy Favourites from Eyecon

Fluffy Favourites is stuffed animal slot released by Eyecon the 14th of September 2016. If you can stomach the cutesy cutesy factor, there is actually a pretty solid game beneath the fluffy facade. You`ll get to test your skills on a classic toy grabbing machine, and there is also a free spins feature with a 3x multiplier boost on every win.

6. 9 Masks Of Fire from Gameburger Studios

9 Masks of Fire was developed by Gameburger Studios and published by Microgaming on their infamous Quickfire platform. As the title implies, you need to land 9 mask scatters on the same spin win the game`s max win of 2,000 times your stake. The free spins feature is the main attraction here, as it comes with 2x and 3x multipliers.

7. Book of Dead from Play'n Go

There is no denying that Book of Dead is very similar to Book of Ra, which is one of the most popular physical slot machines of all time. Some would call it a ripoff, but that does not really take away from the fact that this is a pretty darn good game anyway. Shakespeare stole like a raven, as most artists do. Same goes for slots and games. Our focus will be at the quality of the game itself, and what it has to offer.

8. Bigger Bass Bonanza from Reel Kingdom

Bigger Bass Bonanza is a highly volatile fishing expedition follow-up slot from Reel Kingdom, and it plays out on 5x4 reels with 12 paylines this time. Landing 5-oak cash fish collects their values in the base game, and you have the fisherman wild to help you out with that in the bonus round. The wild is also collected in a meter that awards extra spins and multipliers up to x10. The 4,000x potential can be cracked from a single cash fish, and you can test the demo game and read our full review below.

9. Aquanauts from Alchemy Gaming

Aquanauts is a volatile subsea slot from Alchemy Gaming, and it plays out on a 5x5 grid with 3,125 ways to win. The Rolling Reels multiplier increases by +1 per win, and the Echo Roll™ feature can fill the gaps with a random matching symbol at random times for a guaranteed win. The bonus round comes with several wheel spin extras, and you can buy more via the Upsizer feature. The max win is 50,000x your stake, and you can check our full review below the free demo game.

10. Rainbow Riches Pick'n'Mix from Barcrest

Rainbow Riches Pick `n` Mix is the latest in Barcest`s popular irish luck series, and this time it`s truly up to you to choose your own destiny. There are 5 different bonus features in this game, and you get to choose up to 3 of them to bring with you into the game. You can always change your preference later, but you can only trigger the bonus games you bring with you.

How SlotCatalog ranks the best online slots

The best online slots
As previously mentioned SlotCatalogs ranking describes slot game exposure in online casinos, by region. Simply explained, we crawl over a thousand online casinos daily to see what games they expose the most. During each casino crawl, we go through all the online slots that you can play in the casino. Each online slot will get an average lobby position score. This means that:
  1. Higher placement in the lobby will give a stronger score.
  2. If a game is absent in a casino lobby we will give it the maximum lobby position.
  3. Larger online casinos have more weight than smaller ones. The weight is calculated by the geographical strength of the online casino compared to other online casinos in the same region).

This means that our ranking method is based on an average score / lobby position for each slot game. A lower average means a better, more exposed game.

Interesting facts

Our SlotRank metric is based on all online slots average lobby position scores, but in relative terms. This means that the game with the lowest average lobby position will get SlotRank #1. The game with the second-lowest avg score will get SlotRank #2 etc.

As new games are released daily we update our ranking each day. This way we make sure that you as a player will have the latest ranking available, including the 0-day releases.

The SlotRank metric is also the foundation to the SlotCatalog Awards which we announce twice a year for a few selected markets. In the awards, we crown the best slot games released during a certain time period. If you’re interested in the previous most popular games you should have a look at our awards.

  1. SBC SlotCatalog Awards 2022
  2. Top 10 game releases: July - December 2020
  3. Top 10 game releases: January - June 2020
  4. Top 10 Slots for Jan-Oct 2019
  5. SC Analytics Insights 2019H1 – The best slots released in the first half of 2019

What is a slot machine?

The Slot Machine is a mechanic gambling machine where players can bet money with the chance to win money. The first Slot Machine dates back to somewhere between 1887 and 1895. As you would expect the machine was very basic and consisted of three wheels and five different symbols, one which was a Liberty Bell which also became the name of the machine. The newly invented machine became a huge success and could be found in a lot of barber shops, cigar shops, bowling alleys and saloons.

Since then, the history of the slot machine has continued to evolve. The slot machines quickly got nicknames like fruit machines, bar machines, puggy, pokies and one-armed bandit (due to the lever you pulled to start a spin).

About 100 years later, when the internet technology spread over the world and regular people started getting access to browse the world wide web the idea of the online slot machine started to develop. The huge success of the land-based slot machines were simply too easy to port to an online version. However, it wasn’t all easy. For online casinos to become successful a lot of smart people had to invent important payment systems for painless and secure money transactions online. In addition to this the online casinos had to make sure that potential customers trusted them enough to play online.

Today, Online slots is a term that covers a vast and diverse array of features, themes and setups, and it’s also a field that is in constant development. One thing all casino slots have in common is that they require no real skill to play. As long as you’re able to press the spin button, you’re basically good to go.

How do Slot Machines work?

There’s almost no end to the creativity of game providers when it comes to slot features. Still, some basic features tend to be included in almost every online slot out there. Here we shall briefly explain these generic slot features for you.

How do Slot Machines work?
How do Slot Machines work?

The RNG makes sure the chance of winning is unbiased - Slot machines (both physical and online) are operated by a Random Number Generator (RNG) that’s been certified by third party agencies for fairness and functionality. The RNG technology makes sure that each spin is independent from previous as well as future spins, which means that each time you make a spin on a machine the chance to win is always the same.

The Slot Reels - The virtual Reels are the vertical spinning wheels that show the different game symbols and eventually end up with one specific symbol on each reel when the spin ends. The behaviour of the reels in slots online are programmed in the game software. This includes the graphics, symbols and probabilities of landing the different game symbols.

Paylines - The number of paylines will vary between 1 and all the way up to several hundred thousand (in rare cases). Usually, there will be between 1 and 100 paylines (or ways to win as it is sometimes called), but there are many exceptions out there too.

Paytable - The Paytable tells you everything you need to know about winning symbols, and the payout for each combination.

Bet size - All slots have a minimum and a maximum limit for how much you can bet, but this limit can vary somewhat between each game. Usually, the limits are both low and high enough to suit most players, though.

Wilds, Scatters and Multipliers - Almost all online slots come with a wild symbol and a scatter symbol. The wild symbol will act as any symbol (except the scatter) to maximize your winnings. The wild can come in many forms and combinations, including stacked wilds and sticky wilds (which are the most common). A certain number of scatters (normally at least 3) randomly spread across the reels will trigger the free spins feature on most slots. A multiplier will boost your winnings by a factor of at least 2x, and can sometimes be combined with wilds.

Free spins and bonus games - The number of free spins you get will usually be tied to how many scatters you land, and sometimes you can get additional free spins by landing more scatters. Many slots also come with bonus games that can take many forms. However, some sort of click-and-pick game is common.

RTP, Variance, Hit Frequency and Max Exposure

The theoretical payout potential - usually called Return to Player (RTP) - can vary significantly from game to game online, but the industry average hovers around 96%. This means that the average House edge for online slots is around 4%, and thus significantly lower than most physical slot machines.

Another thing that varies a lot for online slots is something called volatility (or variance). Even though the RTP can be very similar (or even the same) for 2 slot machines, you’ll find that some games payout seldom but big, while others payout smaller wins almost all the time. There is also a middle way here, and it’s up to each player to decide what they prefer.

Do you know?

Make sure to read our guide: All you need to know about the slot game metrics RTP, Variance and Hit Frequency to learn more about the slot game metrics RTP displayed on SlotCatalog.

The different types of online slots

The first online slots were very similar to the physical fruit machines. Those 3-reels machines we often call classic slots. With the boom of online slots, so came the more advanced video slots, with more reels, more ways to win and more innovative bonus games, features and graphics. Some of which are jackpot games, and some which are regular non-progressive games.

Online Video Slots

Video slots are by far the most common type of slot machines you’ll find in online casinos. They have at least 5 reels (sometimes more), and are characterized by sophisticated graphics, sound effects and sometimes 3D intros of almost cinematic quality. There are simpler video slots also, but usually they come packed with innovative bonus features and exciting special effects.

According to SlotCatalog data, since the first video slot was released more than 15.900 video slots have been released by over 350 different game studios. The numbers clearly describe the popularity of video slots. Certain features and technologies connected to video slots have also become very popular lately, one example of this is the Megaways Technology invented by the game producer Big Time Gaming. The technology raised the amount of ways to win substantially, which has been proven very successful among punters.

Classic Online Slots

Classic casino slots have 3 reels, and they are usually a lot simpler in all possible ways than the video slots. Many times classic slots will resemble - or be exact replicas - of physical fruit machines or one-armed bandits. They have a nostalgic appeal for many, but some also just prefer the simplicity the Classic slots offer.

While you may have encountered a large number of different classic slots during the years in brick and mortar casinos and other physical locations, they have not been as popular online as the video slots category. According to SlotCatalog data there are only about 240 classic slots available as online machines.

Progressive Slots Online

Progressive Slots, or jackpot games, is definitely worth mentioning as an own category due to the underlying fundamentals that one lucky player might hit a life-changing jackpot of astronomical sums. But the truth is that this category can be mixed with the concept of a Classic Slot or Video Slot.

The concept of jackpot slots is not new because of the invention and popularity of online casinos. They have existed in physical form since 1986 when IGT invented the concept of a jackpot with their physical slot machine called Megabucks. A fun fact is that these local machines were connected over phone lines in the United States. The chance of winning a huge jackpot attracted a lot of gamblers and in less than a year one lucky player landed the first jackpot close to $5m in Reno, USA.

Nothing has changed since 1986, the opportunity to win big still attracts a lot of players. The progressive slot machines have just become more accessible thanks to the online casinos. Jackpots are hit often and a lot of players participate in these jackpot pools.

How can I play online slots?

Slot machines can be played online in different ways. If you appreciate the chance of winning real money you can sign up at a quality online casino, make a deposit and start playing. With that said, risking money is not for everyone and it’s important to know that gambling can be addictive and cause severe life problems. If you’re of legal age you can enjoy online slots for free here at SlotCatalog.

Playing online slots for real money

To get the most enjoyable experience of playing slots online it’s important to you select a proper and trustworthy online casino. SlotCatalog has made this easy for you as we list these casinos based on the region you browse from. This way, if you’re browsing from the United Kingdom we will only show you proper casinos licenced by the United Kingdom Gambling Commission.

With that said there are still a lot of casinos to choose from. How do you know which one you should go with? We would say that depends on your preferences and recommend you to read our guide on how to select the best online casino according to your needs.

When you’ve read the guide and found a proper casino that you’d like to register with, you should make sure that they have the slot games that you want to play. If you have some favourite game providers you should make sure that they have their games in their game catalogue as well. Last but not least, don’t forget to claim a good casino welcome bonus that gives you some extra credits to play with.

Enjoy online slots for free, without risking any money

As previously mentioned, if you feel like playing online slots without risking any money you can do that as well. SlotCatalog has the most extensive catalogue of free online slots and you can play most of our 17.000 casino games without betting a dime. No registration, No Download and No Deposits required.

If you’re still looking for a way to win real money, but don’t want to risk any of yours, the No-Deposit bonus is the best option for you. The No-Deposit bonuses offered by some online casinos gives you a small amount of bonus spins or bonus cash to play with in exchange for your personal details. Simply explained, you register an account and get a small award for sharing your details. But don’t be fooled, the online casinos that offer these promotions are not trying to be nice. Their expectation is that you will make a deposit sometime in the future.

Let’s bust 4 myths about online slots

Since the early days of the slot machines there have been several widespread superstitious misconceptions about online slots and slot machines in general.

MYTH#1. It’s easy to win money on online slots

This is not true. The statistical return to player (your expected result after a huge amount of spins are usually around 96%) which means that in the long run you will lose money. However, you still have the chance to win, and to win big. But the most probable result is that you will lose money.

Playing more equals a better chance to win - Each spin is random and independent of the previous spins. This means that playing more will result in a bigger number of winning rounds, but not a greater chance of generating winning rounds. The more spins you play the more likely you are to end up with a negative total result.

Games get hot and/or cold depending on its payout history of the latest hours - This is not true when it comes to online slots. However, it’s a common superstition which you can read more about in our Hot and Cold Games section. Each spin is random and independent of the other rounds, which means you will have exactly the same chance to win every time you spin.

It’s not possible to win big on slot games - This is not true. It’s possible to win big on both classic slots, video slots and especially in progressive slots where the jackpot payouts can be huge from time to time. Sometimes the payout is in millions. However, the chances of hitting a jackpot is very slim, but nonetheless very life changing for that one player.

When the fun stops

Gambling can be addictive and online slots are developed to keep you stimulated, entertained and continuously urging you to play more. That’s why it’s very important to have rules when it comes to playing these games. Make sure to keep track of time, don’t chase losses, never play for money you can’t afford to lose, never borrow money from someone to play etc.

The previously mentioned recommendations are good to remember because if you discover that you break them it’s a good indicator that you might have or have started to develop a problem connected with gambling. If you feel that your gambling has become a problem we recommend you to seek help from one of the excellent support organizations available in most countries.

Online Slots FAQ

❔ How do online slots work?

Online slots work in the same way physical slots do. Spin the reels to land winning combinations of the different symbols on the paylines. One difference between online slots and physical ones is that the online slots are often more advanced.

❔ Are online slots rigged?

As long as the games are regulated, which means licenced and audited by a third party the games are completely fair. This means that the result of a spin is always random and independent of the previous one. SlotCatalog only shows properly licenced casinos.

❔ Can I win real money by playing slot machines on the internet?

Yes you can! You can also lose money. Make sure to never gamble with money you can’t afford to lose.

❔ Are online slots legal?

This depends on which country you are living in. We recommend you to research the legal situation in your country.

❔ Can I win real money at online casinos?

Yes you can, but there is also a risk of losing money. Never bet money you can’t afford to lose.

❔ Is it safe to play slot machines?

If you play at a properly licenced casino, like the ones listed at SlotCatalog your chances are in safe hands. However, remember that gambling can be addictive and might cause harm to your personal relationships and financial situation.

❔ Where can I play slots for real money?

As long as you are above 18 years old and live in a country where online gambling is legal you can play online slots for real money at any of the best online casinos listed here at SlotCatalog..

❔ What makes a good slots site?

There are a lot of factors that are important when determining if a slots site is good. We recommend that you read our guide what makes a good online casino.

❔ Do I have to download anything to play the games?

No, normally games work out of the box in your browser. However, some older games might require a flash plugin in your browser to load.

❔ What games have the best payouts?

To discover the best payout slots you can use our filters and sort by RTP. This will list the highest paying slots up top. If you’re looking for quick answers we recommend you to take a look in our best payout slots article.

❔ What progressive slot machines can payout the highest jackpot?

The biggest jackpot won online equaled $21.7 million on Mega Moolah, won by an anonymous player on the 28th September 2018.

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