Online Slots Systems is your guide to the Internet's most popular online casinos. In this page we have organized information on some of the best casinos on the web. There are many factors that go into a casino obtaining a reputable online casino ratings on

First and foremost, we look for casinos that operate one or more of the web's most reputable casino software providers. Some of the largest names in the online casino software space are Microgaming, Playtech, NetEnt, SoftSwiss, Amatic, Evolution, Rival, Saucify, Realtime Gaming, IGT and Bally to name some of better software options.

All of the casinos that we list on OnlineSlotsSystems use one or more of these software platforms to power their casino games. We will never list any blacklisted or rouge online casinos on our website. We keep our list of recommendations short so you can quickly find a trustworthy casino to play slots and other casino games online for money.

Top Online Casinos for USA Players

#1. Lucky Creek Casino - $500 Bonus + 25 Free Spins.

#2. Intertops Casino Red - $100 Bonus - RTG software.

#3. Cafe Casino - 500% Bonus up to $5,000. RTG software.

Top Online Casinos for CA Players

#1. Mr Green Casino - 100% Bonus + 200 Free Spins.

#2. Lucky Creek Casino - $500 Bonus + 25 Free Spins.

#3. Intertops Casino Classic - $100 Bonus - WGS Software.

Top Online Casinos for UK Players

#1. Mr Green Casino - 100% Bonus + 200 free spins.

#2. Bet365 - Highly trusted UK gambling site.

#3. 888 - 100% welcome bonus plus £10 free no deposit needed.

Top Mobile Casino Apps

#1. GSN Casino - Play GSN mobile casino games for free on Android mobile devices.