Riley Testut

Riley Testut is an American indie iOS developer best known for creating GBA4iOS, Delta, and AltStore - tools that collectively redefined what's possible outside Apple's walled garden. Starting at age 13 with a Game Boy emulator built from scratch using Microsoft Paint graphics, Riley spent a decade fighting Apple's restrictions before seeing Delta hit #1 on the App Store in 2024 and launching the first EU-approved third-party iOS marketplace. His work forced Apple to change its App Store rules - twice - without a single lobbyist, just relentless building.