The provider matters as much as the casino. Providers set the RTP options. Casinos choose which variant to run. We tested slots from 20 makers at 4 real-money casinos and recorded exactly what each one serves - not what the marketing claims.
By Marcus Reid·Updated September 2026·20 providers tracked·39 slots tested
Most players focus on the casino. The provider is just as important. Providers don't just design the graphics and mechanics - they set the RTP configuration options that a casino can choose from. One game can have 3 or 4 different RTP settings baked in.
A casino picks whichever variant suits their margin. Gates of Olympus has a published max of 96.5%. We found it running at 94.5% at one casino. Same game, same spins, same mechanics - just a lower payout rate selected by the operator.
Providers who offer wide configuration ranges give casinos more flexibility. In practice, that usually means lower RTPs. Providers with fixed or narrow RTP ranges give players more certainty. That difference shows clearly in the table above.
How to Use This Provider Data
Click any provider card to see every slot we've tested from that maker. Each slot page shows the RTP reading by casino - so you can see exactly where a specific game runs highest.
Look at the comparison table above before you play. If a provider shows a consistent negative gap in the table, assume their games will run below max at most casinos. If a provider sits at or near 0pp, there is a better chance the casino is running close to max.
That said, 4 casinos is a small sample. A provider could run max RTP at one casino and well below it at another. Check the individual slot page for a per-casino breakdown before you decide where to play.
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