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Head to any online casino and you’ll find hundreds of slot games available to choose from. They’re the most popular game to play at an online casino and with so many available, players certainly aren’t short of choice.

Online slots come in various forms with many of the game providers having their own style, features and themes. One thing is for certain though and that is no two slots are them same and so it can often be a case of trial and error to find the ones that suit you best. However, that’s where can help as we provide reviews of online slots to help you pick out the best ones for you without you having to risk your own money playing them.

Online Slot Reviews

There are thousands of online slots available to play at online casinos and so it’s impractical to play every one of them. Instead, you can read our slot reviews to help narrow down your choices and hopefully find the games that suit you best in terms of volatility, RTP, bonus features and max payouts.

We provide ratings for all of the slots that we review but perhaps more important are the individual categories that we cover in our reviews. Just because we rate a slot 10/10, it doesn’t mean that it will be the best choice for everyone. For example, a highly volatile slot may be unique, entertaining, come from a respected provider and has the potential for huge payouts which may result in us scoring it highly. However, a highly volatile slot may not be suitable for a low-risk player looking for more frequent smaller wins rather than less frequent higher wins. That’s why we provide various information in each of our online slot reviews that cover the following areas:

Slot Providers

Online slot games are usually developed by third-party companies rather than the casino themselves. Online casinos often host slots from a range of providers although some choose to only feature games from a select few. Slot game providers have their own style of game that you will get used to the more you play. For example, Hacksaw Gaming slots are generally very volatile. You’ll see a lot of slot streamers on YouTube and Twitch playing Hacksaw slots as they are capable of paying out huge wins which makes for good video content for them. Other slot providers such as Blueprint Gaming often release slightly less volatile slots but are unique in their own way as many of the games from Blueprint have a range of bonus features available within each game.

Some of the most popular slot providers include:

As you can see, there are dozens of slot developers that are currently providing games to online casinos and the list above is just a small selection of the most popular ones in 2022.

If you are playing at a reputable online casino that is licenced and regulated by the UK Gambling Commission (UKGC), you can be confident that all gameplay from the slots are above board and so you should not have to worry about fair play when it comes to choosing a slot to play. However, many slots players have their preferred brand and are on the lookout for new slots that are released by certain providers.

We review the latest slots shortly after they’re released and so we recommend heading back to the page regularly to find new slots that you can play at a selection of online casinos.

Bonus Features

One of the biggest attractions to online slots are the bonus features that many of them have. Hitting a bonus round means that you have at least a chance of a max win and they can often provide some great entertainment via free spins, multipliers and other bonus features.

Although some bonus rounds from the same game developers can be similar between slots, they all have their own unique twist and bonus rounds from different slot providers are often very different. Some players prefer free spin bonus rounds whereas others prefer increasing multipliers or stacked wilds. All of our slot reviews cover the available bonus features of each slot game extensively so that you can determine whether or not you’d like the chance to win the bonus by playing the slot or not.


The RTP of each slot is listed in our reviews and is one of the most important factors to take into consideration when choosing a slot to play.

RTP stands for Return To Player and is displayed as a percentage amount. This is the percentage that the slot game pays out to players based on how much is wagered on the game.

For example, if a slot has an RTP of 96%, it would pay out an average of £96 in winnings for every £100 that is staked.

Of course, you can’t expect to receive exactly £96 for every £100 that you wager on a slot as this would mean that you would lose every time. However, over the lifetime of the slot, it will have paid out an average of 96% of all wagers. Some payouts will be very small and others extremely large but overall, they will average out to the RTP of the slot.


When reading our slot reviews, you’ll notice that each one lists the volatility rating of the slot. The volatility is different to the RTP and represents how often the slot pays out a win and the size of those wins.

A slot that has a low-volatility rating will pay out often and smaller amounts than a highly volatile slot which can pay out less frequently but has the potential for very big wins.

If you are a low-risk player, we recommend playing slots with a low-medium volatility rating. However, if you are willing to take a bigger risk with your betting bank, you may wish to try your luck at more highly volatile slots.

Progressive Jackpot Slots

Progressive Jackpot slots can be found at most online casinos and are popular with a lot of players as they provide the chance to win huge sums of money.

All slots have a maximum payout that can be achieved from a single spin. Some low-volatility slots can pay out around 500 x the stake whereas extremely volatile slots can pay out more than 100,000 x your spin stake!

However, progressive jackpot slots work differently as along with the standard payouts that you can win from the base game and bonus rounds, you also have the chance to win the jackpot prize.

The progressive jackpot often spans several online casinos and isn’t limited to just one. For example, the progressive jackpot on Big Bass Bonanza may be able to be won by players at 888Casino, CasinoLab and Genesis Casino.

The interesting thing about progressive jackpots is that they keep getting bigger with every spin that is played on the game until the jackpot is won. Jackpots can often run into the millions of pounds which makes playing progressive jackpot slots extremely appealing to some players.

As progressive jackpots can be won by players playing at any spin size, playing these games appeals to both low-risk players playing with minimum bets as well as high-rollers.

Megaways Slots

Megaways is a term that was branded by Big Time Gaming back in 2015 when they released the first ever Megaways slot, Dragon Born.

Standard slots pay out a win when certain symbols match on a winline. However, with Meagaways slots there are no winlines. Instead, wins are achieved simply by landing matching symbols anywhere on consecutive reels. Megaways slots also feature a random number of symbols on each reel with more symbols resulting in the potential for bigger wins due to the increased number of megaways.

Megaways slots are just one of the new features that have been introduced to online slots in recent years and have proved to be extremely popular via slot games such as Fishin’ Frenzy Megaways, The Dog House Megaways, Gonzo’s Quest Megaways and several others.

New Slots

Although there are thousands of online slots to choose from, new slots are released on a regular basis from some of the top providers.

Online slots have evolved over the years and the providers are always looking for new and exciting ways to improve them whether this be with new slot bonuses, new graphics & soundtracks or new ways to trigger features. This makes it more exciting when a new slot game is released by a provider that you’re fond of.

Here at, we list new slot games on this page and review them as soon as they hit the casinos. We personally play all new slots and provide our honest and impartial reviews of them so that you can decide whether or not they’re worth playing.

Best Slot Sites

Not only do you have to make the tough decision of which slots to play but also which online casino to play them at. All of the slot sites listed here at CasinoCalculator have been tried and tested by our team of experts and we give a rating to each one. We recommend reading our reviews of the best slot sites to find a casino that is right for you.

Not all online casinos are the same and some will provide a far greater selection of slots than others. You will also find that some casinos may not have the largest range of slots but have a catalogue featuring slots from more game providers.

If you are interested in playing a certain slot game, you will find a recommended slot site on the review page of that slot. You’ll be able to play the slot at this casino along with others that are listed.

Some casinos also offer slot bonuses which may be worth claiming if you are mainly going to be playing slots. Slots are a great choice of game when it comes to meeting the wagering requirements of bonuses and nearly all slot sites offer them to new customers.


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