Safest Online Casinos and Their Sister Sites

Without a doubt, online gambling is one of the most popular and fun things to do. The market currently stands around $66.7 billion a year, and it is growing at rapid pace. However, it is only fun if you choose a trusted and safe online casino site. If not, anything but fun is waiting for you.

On our site you can find reviews of almost every online casino site (or at least those worth mentioning). Unlike other review sites, we include information on sister sites and the parent company as a whole. Keeping all the data in mind, our site provides a highly precise evaluation of each casino.

Best Casinos & Sister Sites 2024

What are Sister Sites and What They are Good For?

Knowing the company and sister sites connected to a casino gives you a huge advantage. First, you will know exactly which casino in the family is the best fit for you to play at. A great example of this is when a new casino is advertised with great feedback or promotions, but its sister sites are swamped with complaints. This gives us some insight that the newer site will likely follow similar footsteps.

The biggest advantage of sister casinos is that it’s the perfect way to find new gambling sites to play at. Who is a better judge than yourself?

No matter how many reviews or forums you read, nothing compares with first hand experience. When you are searching a new place, or new bonus, the sister casinos of your favorite site are likely to be the perfect match.

And that is exactly the purpose of Sister Sites Guru. We bring a comprehensive list of all online casinos, their sister sites & similar brands. We hope to enable players to diversify their gaming experience in a safe and smooth way.  

Are Online Casinos Safe?

We’ve been asked this question countless times and the answer is always: Yes, but it’s your job to make them so. That is true for any deal with money, (like using a broker, investment company or financial adviser) and it’s even more so when it comes to the internet.

If you rush into the first casino you found chasing a bonus, we cannot ensure that it is safe. There is always a small chance that it’s not a safe site. And that small chance can turn out to be very costly…

We will now go over in detail how to check out a new casino and ensure safe playing. We will go over:

  1. * If the casino and its company have a long history of operation.
  2. * If it has a clean history when it comes to withdrawals.
  3. * If it is properly licensed.
  4. * If the games come from known providers.

If the answer to all these questions is “yes”, then indeed this casino is safe to play at.

How We Rate Online Casinos

Here are the main aspects we check while ranking a casino.


License is the first thing to check on any gambling site. Not all license authorities are the same, some are good and some are completely worthless. But you should still never play at any casino that doesn’t carry a proper license.

If the casino doesn’t have a license we automatically grade it as 1 out of 5. This is no matter how it stands in other aspects.

History of Operation

Did you know that only half of new business survive the first 5 years? When it comes to online gambling, the number is even lower. We consider 3 years to be the bare minimum, and won’t give a perfect score to a casino that has been operating for less.

This is another advantage of sister sites. New casinos that come from old and reputable companies are exempt from this rule. These sites are the best of two worlds: new and exciting site, but with experience and long history of operation.

Withdrawal Limits & Speed & History

This is one of the most significant aspects to check. Bringing ‘home’ extra cash is the reason why most people play at any casino. And when we win, we want to get that money fast and hassle free.

But it’s more than that. Stability and the speed of withdrawals are the best indicators of a company’s financial stability, fairness and professionalism.

The withdrawal times and methods vary between one country to another. However, when you see 5 star rating it likely means that this is one of the fastest paying online casinos in your area.

Software Providers

Eventually, we are here to play and the game selection is the essence of an online casino. Each player has their own taste and preferred game selection. Do you like slots, blackjack, craps, video poker or classic slots? Do you want new flashy or classic old school?

When we rate this aspect, we mainly focus on variety offered and the availability of high RTP versions in each game type.


The difference between top level casinos and mediocre ones is clearly visible when it comes to customer support, professionalism and expertise. Again, that’s kind of similar to any other industry in the world.

Some will do the minimum and drag you from one person to another. Every minor issue can become a wall that you need go through. On the other hand, customer support at high level companies is a pleasure to deal with. They are helpful, resourceful and highly professional.

We always get in touch with the casino support during our review, even if no real assistance is needed. We recommend you do the same. A casino without solid support won’t get more than a 4/5 rating, even if all other aspects are solid.