Delta is the successor to a popular GBA emulator, GBA4iOS, made by the same developer and started development back in March of 2015. Similar to RetroArch, it uses a core-based approach with each system running of its core, however, it is not the same as Libretro format.
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Delta emulator is an iOS application that allows you to emulate and play video games for several classic video game systems, including Game Boy Advance, Nintendo 64, and Nintendo DS. Delta is the spiritual successor to GBA4iOS — a Game Boy Advance emulator for iOS devices.