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The world of online casinos seems immense. You can find everything: from the most reputable casino that is awarded multiple times to the scam casino whose sole purpose is to get away with your money. How can you know how to select the proper casino, especially if you consider that this is an online market where you don’t actually get to try the product? Do you feel like you first have to give away your precious money without knowing what comes next right?

In the era of rating/comparison sites (like us), popularity criteria seem to solve this problem and shape public opinion. However, is this factor enough? Is a popular casino necessarily trustworthy as well? Usually, yes, but not always. This is where we intervene to guide you through the list of popular online casinos 2021 that follows:

Most Popular online casinos 2021

King Billy Casino Bonus up to €1,000 + 200 free spins 8.8/10
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Jack21 Casino 120% up to €360 Bonus + 50 free spins 7.6/10
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Stay Casino Up to €800 Bonus + 350 free spins
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iLucki Casino €300 + 100 free spins + 20 no deposit spins
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Rolletto Casino Up to €6,000 7.3/10
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Boomerang Casino 100% up to €500 + 200 free spins 7.8/10
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How do we measure an online casino’s popularity?

One of the most reliable ways of measuring a casino’s popularity is the Alexa rank. Amazon’s web traffic analysis tool estimates the number of visitors and their engagement with each website. Are the given ranks of online casinos accurate enough to measure a gambling site’s popularity? Well, you should keep in mind that Alexa counts visitors, not players who actually deposit and gamble. Of course, more visitors mean more depositors and subsequently, more loyal players. However, we can never be sure about the exact numbers. Some casinos even use cheeky methods like pop-ups in gambling-related sites to increase their traffic.

Alexa rank gives some insight, but what are the ‘special secrets’ that make an online casino popular in the players’ minds? Other players’ opinions. Yes, it’s that simple. Before you decide to buy a new product or not, you will read its reviews. If you see that other consumers praise the product, then your hesitation goes away. The same stands for online casinos. Mouth-to-mouth influence might not be measurable, but trust us, it still is a decisive factor when it comes to creating a list with the most popular online casinos in 2021.

Players’ forums are everything. They can put a casino on a throne and declare it as the indisputable king, or throw it in the deepest darks of the internet, turn it into a desert that nobody wants to visit. So, mouth-to-mouth word can work negatively as well, making a casino look even worse than it actually is.

However, you have to be preoccupied when you visit such forums. You may come across comments which aren’t necessarily made by players. A casino might post excessively positive comments via their own executives or even using fake bots to improve its image.

On the other hand, players can become petty just because they faced a misunderstanding with the casino’s management and fire all their hate towards the brand. What is our point here? Don’t trust them 100%, they might be misleading.

It isn’t really a secret that New Casinos can become popular because players are always in search of new operators, new bonuses, etc. These types of casinos start with some impressive welcome bonuses, which later they drop. That’s why their popularity doesn’t last more than the first few months of their existence.

How to find the most popular casinos?

Finding the most popular online casinos is not an easy task due to different local markets’ preferences. A Swedish player takes into account different criteria before he joins a casino than an Australian one. For example, a Swedish player searches for NetEnt games and Trustly transactions while an Australian is more interested in Aristocrat, IGT or Ainsworth pokies, and Neosurf payments. We tried to identify the local criteria that seem to apply to almost all players, and we present them below:

Providers and game variants

Depending on your place of residence, you are familiar (from advertising or partnerships with local online casinos) with certain providers. So, if you get to trust specific brand names, it’s only normal to search them in any new casino that you visit. The same happens with games. Players from the USA are used to American Roulette, and they will be annoyed if their new casino offers only the European one. It will be disturbing for them to learn the new rules (even though they should, as the European Roulette offers better odds, but that’s another story). The availability or not of a specific provider might explain why a brand could be among the most popular online casinos in the Scandinavian markets, but at the same time, nobody seems to realize its existence in the UK.

Currency and popular payments

When it comes to casino transactions, we are sure that you prefer to make them in your terms. That’s why an operator that accepts Russian Rubles and offers payment methods like Webmoney or Qiwi would have a good chance of becoming one of the popular casino sites in the Russian market. Compare it to an operator that obliges Russian players to deposit in Euros and offers only international payments. You can quickly realize that the first one provides the advantage of localization. Players don’t like to open accounts to new, unknown payment processors or be obliged to gamble in a currency that they aren’t sure about its value.


It’s not uncommon for popular casino sites to localize their bonuses, usually their welcome offer. This doesn’t happen only for marketing purposes, but sometimes legal guidelines may force an operator to conform to the local regulations. For instance, in Sweden during the pandemic of Covid-19 all the welcome bonuses were reduced to 100 SEK due to legislation changes regarding online gambling.

888 Casino is an example of a casino that offers localized bonuses, changing its welcome offer from region to region. Players from UK/DE/AT/IE/CA can claim a 1500 welcome package plus 88 no deposit money, but players from Spain receive just a first deposit 100% matching bonus up to €150 plus €20 no deposit money.

Site and Customer Support Language

A site translated in your language immediately gains points, as it makes you feel more comfortable while browsing. Popular online casinos like 1xbet or Melbet target various jurisdictions, so integrating their local languages proved beneficial. Specifically, in 1xbet, you can find 59 languages from English and German to Armenian and Swahili. Also, online casinos that target many markets can gain the player’s trust if they offer customer support services (live chat, email) in their language. Don’t be surprised, though, if you won’t manage to have proper communication with the customer service agent. Sometimes, they use templates and Google Translate and only answer specific questions.

Time to choose: Is the most popular casino necessarily the best?

Well, it’s not a shame to go with the flow sometimes. Usually, in the online casino industry, the operators with the most visitors and the most positive reviews are also the best choices. However, you should be able to recognize a problematic casino even if it is popular. If a casino presents one or two problems but succeeds in most parts, it wouldn’t be a bad idea to wait a bit before you condemn it. However, in case, an operator cannot follow the trends of the era or doesn’t show any sign of fixing its wrongdoings, especially the ones regarding transactions, it’s time to move on to a new casino.

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How to find a reliable casino

Security is important when playing at online casinos. These are 5 signs of safe casinos:

1. License from a respected regulator
2. eCogra & TST certified
3. SSL Encryption (https)
4. Fast Customer Support response
5. Games by well-known casino providers
Signs of a scam brand

Most rogue casinos have certain characteristics you should use as a warning sign. These include:

• License with a non-clickable logo
• Fake casino games
• Hard-to-meet wagering requirements
• Withdrawal request delay or denial
• Cheating RNG

Online casino comparison
Why compare online casinos? Because ratings and reviews, as the ones found on Best50Casino, are the best way to find top casino sites. This way you know you are playing at a casino that’s safe and has the best bonuses and games.
Responsible Gambling tips

We value Responsible Gambling practices above all. Make sure you follow the tips below:

• Handle your gambling budget wisely
• Don’t play online when you’re drunk
• Never try to win back what you lost
• Don’t gamble when you’re upset
• Try other forms of recreation as well