JohnSlots: The Best UK Slots and Casinos Comparison Site

🏆 In the list below, you will find only 30 casinos that have passed our rigorous tests to be considered for our most valuable recommendation to players. According to our data, in July 2025 players chose All British Casino as the best casino to play at, followed by Bzeebet, and CasinoKings in the second and third spots.

How We Review British Online Casinos and Slots

If you’ve ever wondered how we review online slots and casinos available in the UK, and the steps we take to ensure all of the information we provide is unbiased and accurate, you’re in the right place. In truth, there’s a lot of effort involved in keeping up-to-date with all of the latest sites and slot games, but that’s not something we mind. In fact, we’re proud of our expert team’s ability to produce high-quality reviews whenever a new slot or a site comes to our attention.

Our main focus has always been to deliver authentic and helpful reviews, and we’ll always give an honest opinion regarding our findings. As such, we feel it’s important to share our process to give you insight as to how our review team draws upon its years of experience to help you pick the right casino or game. So, let’s dive right in.

Our Review Process

Our review process is straightforward and foolproof, which enables our professionals to spot the best sites and games with ease. Still, we understand that players all have different things in mind when choosing where to play next. That’s why our process takes numerous factors into account, instead of simply providing a general overview of our experience – we leave no stone unturned so you can make an informed decision.

Even after reviewing hundreds of online casinos and slots, we remain as diligent as ever. So, as soon as we see a new brand has launched, we make it our mission to give it a thorough review, using the following criteria:

Welcome Bonus

Analysing a casino’s welcome bonus is a great way to gauge the generosity of a site. After all, it’s designed to attract new players, so it’s how casinos attempt to make a solid first impression. The thing is though, we’re not blinded by flashy bonuses promising huge rewards for signing up. Our process involves combing through the terms and conditions to determine the true value of the offer to see if it’s worthwhile. That involves checking wagering requirements, minimum qualifying deposits and whether there are any game restrictions. Once we’ve got a feel for the offer, then, and only then, do we offer a recommendation.

Licence

Your online security is paramount. We’ll only ever recommend trustworthy sites that have obtained an official licence from the appropriate authorities. In the UK, that job falls to the United Kingdom Gambling Commission (UKGC), so whenever we review a new site, we’re instantly on the lookout for the UKGC’s seal of approval. Of course, other licences also help to bolster a casino’s position, provided they’re awarded by equally stringent regulatory bodies, such as the Malta Gaming Authority (MGA).

Game Selection

With slots being at the core of our business, we pay special attention to this part of the evaluation. Any casino needs a large selection of casino games if it’s going to attract new players and be featured on JohnSlots. That’s why we take the time to examine each site’s iGaming library to make sure it has a diverse selection of games, placing extra focus on the online slots section due to the immense popularity of the genre and its importance to us. Any site that has a wide range of classic slots, jackpot slots and new releases is going to score higher when it comes time to reveal our overall rating!

Game Providers

Like with any industry, certain companies rise to the top because of their ability to consistently deliver top-quality games. So, when reviewing any new online casino, we immediately check for big names such as Big Time Gaming, Microgaming and Pragmatic Play, among many others. If we find that the site has partnered with these award-winning developers, we’re much more confident that the casino is doing its best to guarantee a first-rate experience.

Extra Promotions

Yes, welcome bonuses are important, but further promotions and offers will give you more reasons to stick around. We check to see if there are any added extras such as reload bonuses or cashback offers, and whether or not there’s a loyalty program in place to reward returning players. We believe extra promotions are a critical component of any online casino, so the more that’s up for grabs, the better!

Customer Support

We rigorously test each casino’s customer support package to gain insight as to how well it performs. Of course, we hope you never run into any issues when gambling online, but if something were to occur, we want you to know you’re in safe and experienced hands. As such, we’re looking for 24/7 coverage, with multiple support channels available – live chat, email and telephone, along with an extensive FAQ section.

Rating The Casino

In addition to an in-depth analysis, each casino we review receives a star rating out of 5 as well as a brief summary and a list of pros and cons so that you can see our verdict at a glance. That’s not all, though. We also list all of the available payment methods, game providers and an estimate of how many games you can enjoy at the top of each review. That way, you can get a quick feel for a site before you head further into the finer details.

Casino Bonus Transparency

All of our casino reviews highlight the site’s welcome bonus. The thing is, each offer is subject to specific terms and conditions, and that’s the information we include in our reviews to measure the true value of the bonus. So, what do we look for?

• Wagering requirements: In nearly all cases, when you claim a bonus, you’ll have to deal with wagering requirements. This refers to the number of times you must wager your bonus amount before the casino converts anything you have left into real money. Ideally, you’ll want a figure around the 30x-40x mark to give yourself a genuine chance of cashing out.

• Bonus codes: Some offers require you to enter a bonus code to activate the offer. If necessary, we’ll highlight the bonus code within our review and also provide a step-by-step guide detailing how to use it.

• Validity period: Casino bonuses don’t last forever. You have to meet the T&Cs within a specified timeframe or else risk forfeiting the offer. So, we also let you know how long the bonus is valid for – a week, 2 weeks, a month, or however long.

• Game restrictions: Another thing to watch out for is whether or not a bonus limits you to only playing certain games. That’s why we also check if there are any restrictions and what the wagering contributions are for each type of game.

High Standards

It isn’t just empty talk when we say we have high standards. If a casino doesn’t fit our exact requirements, then we won’t recommend it. After all, we want you to be able to trust our recommendations. All of our reviews are written openly and honestly, and if any new information comes to light after publication, such as a licence breach, we’ll automatically mark the casino as “not recommended”.

Responsible Gambling

Above all, we want you to be clued up and safe when gambling online. Gambling should always be a source of entertainment, not a way to make money. As such, we’re committed to promoting responsible gambling practices so that you’re fully informed about the range of available tools.

Check out the responsible gambling page to learn more. There you’ll find plenty of helpful information that should help you to keep things fun!

✉️ Get Rated by JohnSlots

If you operate a UKGC-licensed casino or you have developed a slot we haven’t reviewed yet, get in touch with us. We will walk you through our process, and in the end, you might get your brand featured on our site.

JohnSlots Recommends

🔥 Editor’s Choice: Best Free Slot This Month

Sizzling Hot Deluxe is a fruit-themed video slot by Novomatic, featuring 5 reels, 3 rows, and 5 paylines. With a maximum win of 1,000x your stake, it offers a gamble feature but lacks free spins or multipliers. The game has a low to medium volatility and an RTP of 95.66%.

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This week’s most-played game on JohnSlots is Return of Kong Megaways, a well-designed slot from Blueprint Gaming that offers up to 117,649 ways to win. With stunning visuals and an animated Kong cheering you on, the game also features wilds, cascading reels, mystery symbols, and free spins. With an RTP of 96.03% and medium to high volatility, this jungle adventure promises nonstop fun and big win potential.

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Enjoy free slots, join Tournaments to win prizes, play Jackpot Slots, or just have fun at a live casino. We have everything covered for new and seasoned players.

More About JohnSlots

At JohnSlots, we are the ultimate destination for everything related to online slots. As a UK-based company owned by Gentoo Media, our parent organization’s goal aligns with ours: to provide a safe and fun place for players who look for the most comprehensive and unbiased slot and casino reviews out there.

🛡️Why Trust JohnSlots?

At JohnSlots, we prioritise our readers’ experience above all else. We care about more than just providing you with reviews of online casinos and slots—we ensure each piece of information presented on our website holds meaning and is accurate, timely, unbiased, and transparent. That’s because we want you to see that you can trust our review team, and you can do that because we offer:

1. Industry Experience: Our 12 experts bring a combined 50 years of experience in reviewing online casinos and slot games.
2. Monthly Reviews: We review between 5 to 15 casinos and 10 to 20 slots each month, ensuring constant, up-to-date coverage of all the new brands and releases.
3. Transparent Review Criteria: Each casino review takes approximately 60 hours of combined work, including research, data collection, testing, and fact-checking.
4. Data-driven Analysis: We allocate £120 for deposits and playtesting for every casino review.
5. Player-centric Approach: “Data Collection and Verification” is the most time-consuming part of our process, taking up to 16 hours per casino.
6. Regulations Check: Our team dedicates 8 hours to researching every casino or game before beginning a review.
7. Continuous Updates: In the past year, over 150 casinos have applied to be featured on our website, but only a select few were approved due to our high standards.

✅ Industry Experience

Our review team consists of 12 experts who have over 50 years of combined experience reviewing online casinos and slot games. They know which features are essential in an online casino or slot. They review up to 15 casinos and 20 slots each month, so they know all the traits of good platforms and games as opposed to mediocre ones. Their expertise allows us to publish reviews and guides with unparalleled insight based only on our research, never on other guides or unchecked sources.

✅ Detailed Monthly Reviews

We review new casinos and slot machines each month. When we decide to review one, we ensure that we leave no stone unturned in our testing and review process. That’s why our reviews are always detailed and full of essential information that can make a user’s experience more pleasant. We review the game lobbies, promotions, available payment methods, transaction limitations, fees, terms and conditions, and everything else that shapes a user’s gaming journey. We also pay extra attention to security features and licences, ensuring that all casinos and slots we recommend are safe for users.

✅ Transparent Review Criteria

Are you wondering how we form our opinions of the casinos and games we review? It’s easy—thanks to our expert reviewers, we have a foolproof way of collecting data from each platform or game we test. Our review criteria include essential factors like the availability of top-notch security features, a valid gambling licence from a trusted regulatory body, a game lobby powered by the leading software providers, games with high RTPs and fair terms, bonuses with transparent details and hefty prizes, and so much more. Our experts spend up to 16 hours collecting and verifying data to ensure every review is accurate and trustworthy.

✅ Data-driven Analysis

Each review we prepare for you undergoes hours of preparation and testing. This allows us to provide accurate and detailed information about each part of the casino or game. For example, we’ve calculated that around 16 hours of data collection and verification go into a single review. Our team also dedicates 8 hours to researching the casino or game before we even start the review. Moreover, we invest up to £120 to deposit in an online casino or to test a specific game.

Some reviews take up to 60 hours to prepare, depending on the complexity of the platform we review. But this isn’t a problem – we can test and review for as long as is necessary to provide our readers with the information they need.

✅ Player-centric Approach

Our primary goal is to provide readers with information to help them determine whether a specific casino platform or game meets their standards and preferences. So, we always put ourselves in your shoes and talk about casinos in a way that helps you see the shortcomings and advantages of a specific platform. If the casino has a good UI and easy navigation, we’ll tell you all about it. And we’ll mention if the loading speeds are not up to par. We are here to discuss everything that shapes your experience as a player.

✅ Regulations Check

We will never recommend a casino without checking its licensing status. Regulations are important to us, as nothing short of a valid licence ensures that our readers are safe and secure when playing on a platform we’ve recommended. Thus, one of the first things we review is the licensing status – whether the casino has a licence from a trusted regulatory body.

✅ Continuous Updates

Some promotions expire, some games get redesigned, and some casinos undergo a complete identity change to stay relevant in the ever-changing iGaming market. If an online casino or casino game undergoes a significant change, we are here to tell you about it. We constantly update our reviews to ensure they stay relevant, so don’t hesitate to consult them to see what’s happening with a specific casino platform or game. Our team reverts back every 3 months to verify if all the recommended operators have the same offers, standing, licence, and features.

References and Sources

We strive to provide accurate, unbiased, and up-to-date information by relying on reputable sources, including research papers, reports from trusted organizations, and established websites. Below are the references supporting this page.

• UK Gambling Commission
• GambleAware
• eCOGRA
• Gamblers Anonymous
• Gambling in the United Kingdom
• Slot Machine Terminology
• UK Government Legislation
• Department for Culture, Media & Sport