The Best Slots Sites of 2021

Here at Slot Tracker, we’ve taken the time to identify the best online slot sites that offer a varied collection of high-paying slots, reward you with free spins and bonuses on slots, and provide you with a great gaming experience overall.

Top Rated

Most Popular

Best Paying

Biggest Wins

Slot Tracker’s Ultimate Slot Sites for 2021

What gets a slot site our Top Rated seal of approval?

They’ve got to be a slot-focused operator that welcomes players with an exceptional bonus, offers a great level of customer service and boasts a huge collection of online slots by dozens of top-tier game providers.

Most Popular Slot Sites

Slot sites worth their salt make it onto our Most popular list.

These are household name slot sites that earned their status amongst players by offering attractive bonuses and exclusives on the latest games, year after year. These are the ones you can really count on!

Best Paying Slot Sites

If a slot site’s RTP is high based on our community stats, they’ll appear here.

Slots sites publish their own RTP but we use accurate RTP rates based on real gameplay to make our assessment. Casinos that offer excellent bonuses and rewards schemes are also considered.

Sites with the biggest slot wins

Curious about which slot sites offer the greatest wins? Here they are.

Some slot sites garner a reputation for generating big wins due to massive pooled jackpot games and the like. Based on community stats, we’ll let you know exactly where the biggest slot wins have happened.

Search all slot sites

What to look for in new slot sites

Looking to play at a new slot site? The place you settle on will make all the difference to the online slots you’ll be able to play, the bonuses you’ll receive and your experience all round. Here’s a checklist to use next time you’re choosing between a selection of new slot sites.
  • 1. Casino bonuses and promotions

    Casino bonuses make playing online slots all the more enjoyable by providing you with extra funds or spins to play with.

    When making your choice, you should consider both the welcome offer and any subsequent promotions you’ll be able to participate in. It’s also essential to review the wagering requirements of these bonuses as these may affect what you can walk away with.

    We tend to prefer slot sites that offer bonuses with low wagering requirements, or no wagering at all. On top of that, slot sites that run regular offers and promotions - be it tournaments on new or popular slots, free spins for existing players or prize drops - get our vote. After all, it’s these promotions that will constantly give you a chance to win something extra while playing slot games.

  • 2. Selection of slots and providers

    It’s only natural to look for slot sites with a variety of online slots and game providers but exactly does this choice get you?

    A vast choice of video slots to play increases your chances of finding something you’ll enjoy - be that classic fruit machines, 5-reel slots or Megaways™ and Cluster Pays™ slots. Each comes with their own volatility and payout structure, meaning that you’ll find something to suit your preferences and budget.

    The best slot sites offer a range of games from big-name providers such as NetEnt, Microgaming, Pragmatic Play, ELK Studios, Play’n GO, Red Tiger Gaming and more. They won’t be shy about showcasing the variety on offer as well as weekly new releases either. If you’re always on the lookout for something new to spin, keep an eye out for slots sites that rate highly here.

  • 3. Payment methods accepted

    If you intend to play slots for real money, then you should join a slot site that gives you flexible payment options for deposits and withdrawals.

    Your choice of payment options means that you can stick with your current, trusted payment provider ensuring that your funds will safely reach the slot site you’ve chosen. Likewise, once you hit a big win and are ready to withdraw, you’d like to feel assured that your money will reach you safely.

    Remember, payment methods will also differ according to the country you’re from. For example, BankID is popular amongst Nordic players while UK slot sites restrict the use of a credit card. In our slot site reviews, you’ll find out what payment methods a slot site offers so there shouldn’t be any surprises when you reach the Deposit tab.

    Popular Casino Deposit Methods

    The best slot sites typically accept the following popular payment methods:

    • VISA
    • Mastercard
    • PayPal
    • Neteller
    • Skrill
    • Ecopayz
    • Trustly
    • Paysafecard
    • Wire Transfer
  • 4. Overall slot RTP

    Remember, RTP is the Return to Player, expressed as a percentage, of the amount paid back to real-money players over the long term.

    The RTP can either be specific to a slot - Starburst’s RTP is 96.1% -, or it could refer to the overall RTP rate of a particular casino. Naturally, the more high RTP slots available on a slot site, the higher the site’s overall RTP rate.

    With Slot Tracker, you can review RTP in two ways. You can check the game’s info section of the official RTP value or you can refer to our own accurate RTP figures based on the Slot Tracker community. Download Slot Tracker to see:

    • The overall RTP rate of every slot site linked to our tool
    • The actual RTP rate of every online slot based on our community’s real-money spins
  • 5. Good level of customer support

    Professional support is a benchmark of any great slot site these days, and we value those operators that put in extra effort towards ensuring that players are kept happy! The best slot sites offer 24/7 customer service via chat, email or phone, and employ a team of professionals that will be able to assist you with your queries, help you take advantage of bonuses and other offers!

  • 6. Mobile slot gaming experience

    The best slot sites of today are definitely those who also allow you to enjoy their games on mobile devices. Some of them have their own dedicated mobile app which you can download for a more immediate access to your favourite games while on the go.

    All new slot sites have also got a mobile-optimized counterpart of their desktop site, enabling you to browse through their collection, deposit, claim bonuses and benefit from all the perks on mobile without compromising on quality or user-experience!

  • 7. Responsible gambling policy

    The best online slot sites are those that are strictly committed to responsible gambling standards, and which promote smart gambling behavior. When we review new slot sites, we take a look at operators’ responsible gambling measures to make sure that players will have access to the tools they need. For instance, responsible gambling tools at UK slot sites will include:

    • The option to set deposit, session and loss limits
    • Questionnaires to help you assess your risk of problem gambling
    • The option to self-exclude yourself temporarily or permanently.
  • 8. Casino licence

    We always pay attention to the slot site’s license before we recommend a site on any market. The best slot sites have acquired multiple licenses to be able to accept players from different countries, such as the UK, Sweden, Europe and the US. A license from a respectable gambling jurisdiction will also offer added peace of mind that the slot site is fair and secure.

How to make money playing at slot sites

First off, remember that slot games are games of chance, which means that there is no sure way of making money by playing slots. That said, some online slots pay out way better than others, and downloading Slot Tracker will help identify the best slots, and the best slot sites where to play them at!

You can win more on slots by choosing those games with the best RTP and hit rate. We like to go for slots that offer steady payouts, as well as games with rewarding bonus rounds and a great win potential which would pay out big amounts should you get lucky! Slot Tracker gives you all the details you need on every single slot in its network, so you can pick the best paying slots to wager your money on!

What’s more, you can also identify the best slot sites that offer extra rewards on slots, like free spins or extra cash, and which increase your chances of making a profit!

Best Free Slot Sites

Practically all online slot sites will typically let you play their slots for free!

You can do this by registering with a site and trying the games in ‘demo’ or ‘play for fun’ mode. These free slot sites will allow you to play free online slots with fake money for as long as you like, enabling you to take your time to decide whether or not you would like to play the games for real money later on.

How secure are slot sites?

Slot sites that are licensed by a reputable jurisdiction, such as the UK Gambling Commission and the Malta Gaming Authority, are highly secure. All of them have SSL encryption on their sites to protect players’ sensitive data, and their games all work based on a Random Number Generator that makes outcomes totally random and fair.


The choice of both popular and new slot sites for players these days is huge, and in fact it can be quite overwhelming to identify the best ones! Slot Tracker can help you do this by showing you how much you and other players are winning from each slot site, and by giving you accurate RTP rates and other valuable data. With the help of this tool, you’ll be well equipped to identify the best slots, discover new ones and find out where it’s best to play them for free or real money!


Can a casino ban me for using Slot Tracker? +

No. Slot Tracker does not break any known terms and conditions for any casino. We spent a considerable amount of time reviewing terms and talking with casinos directly to assure that Slot Tracker is 100% safe to use.

Is it legal to track the slots? +

Yes, it's perfectly legal to track the data you generate from any game provider when playing their games. This spin data is held in your computer's memory and belongs to you, you are free to take a copy of this data at any time.

Do I have to pay to use Slot Tracker? +

Slot Tracker is completely free to use. All data is open and transparent for all users. You can use our discovery section to see data for all slots and casinos or create your own account to start tracking your own data and contributing to the community data pool.

How does Slot Tracker work? +

Slot Tracker is a Chrome extension that monitors the traffic sent back from the casino to your browser. This traffic contains the details about your bet, winnings and bonus information. It takes a copy of this data and stores it inside your Slot Tracker account so it can be viewed.

Get your Slot Tracker account for free

Last but not least, one of the best things about Slot Tracker is that this tool is completely free to use! All you need to do is download the tool, enable the extension, and your account will be set up in no time. As you start playing, Slot Tracker will generate all the relevant data back to you.

Are you ready to discover the best online slots out there? Download Slot Tracker today and gain access to the most accurate slot statistics on the planet!

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