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As a casino player, have you ever noticed the name of a software provider attached to a slot game, but wondered who they are and why it matters? The company that makes the slot – from the graphics to the payout math – is called a casino software provider. These studios create the games, and casinos license them, choose which versions to offer and have them tested.
Top-rated online casinos for US players
Offers checked · Ranked by our editors
- 1
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- 4
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- 6
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- 7
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- 9
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- 10
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- 2017Founded
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- 11
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- 2001Founded
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- 12
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100 free spins welcome offer
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- 2003Founded
- ~24 hrCrypto payout
- 11Coins
21+. New players only. Wagering and max cash-out apply; check the operator’s terms before you deposit.
Listed operators accept US players but are licensed offshore, not by US state regulators. We may earn a commission from links on this list. 21+ · Gambling problem? Call 1-800-GAMBLER.
Who Makes the Games
IGT, a long-established US slot maker known for its Wheel of Fortune slots, Australia's Aristocrat and Austria's Novomatic are among the best-known makers of land-based slot machines. Want 3D-style graphics? Betsoft is known for that. Live lottery-style, dice and card games streamed from studios? That is BetGames.TV.
NetEnt is a Swedish online slot developer that Evolution acquired in 2020, and Evolution itself is best known for live dealer casino games. Microgaming, based on the Isle of Man, was one of the earliest online casino software companies, and its games are now distributed by Games Global.
Bally and WMS are classic US slot brands that are now part of Light & Wonder, and many of their games have made the jump online.
How to Check a Game
How do you spot which company made a game? The developer name usually appears on the loading screen and in the game's info or help screen.
The paytable or info screen is also where to spot the game’s RTP (Return to Player percentage) and the name and badge of the independent testing authority.
These RTP figures are compiled from thousands or millions of simulated spins and are game-specific. They describe expected payouts over a very long run of play, not a single session.
Some casinos may offer slightly different RTP versions of the same game, so dig into the paytable to check this. The information screen - often via the settings or help icon - will show the verified RTP if it’s been published. If a casino won’t offer a disaggregated RTP breakdown, tread carefully.
Why RTP Can Vary
The provider sets the RTP versions a game can run at, and the casino picks one. Independent test labs check the random number generator, RTP calculation, payout logic and backend fairness of slots and table games.
Licensed U.S. Casinos vs. Offshore Sites
If you’re playing in a U.S. state with one of the licensed online casino markets, then you will only see state-sanctioned games.
Many of their games come from companies with a land-based presence, so players often recognize the titles from casino floors.
In states without legal online casinos, the sites that accept players are offshore. Offshore casinos are not licensed in the US, even if they describe themselves as regulated, and their game libraries often come from different studios than those at state-licensed sites.
What to Look for Before You Play
Before you dive in, remember, you can check the RTP and testing authority of a slot in the paytable or info screen. The developer name is usually on the loading screen and in the game info screen. Knowing the provider tells you who built the game; the info screen tells you which version this casino is running.