Because these emulators are not officially on the App Store (though Delta is now available officially as of April 2024), you must the IPA. Here is the safest method using AltStore (No jailbreak required for iOS 14-17).
However, Apple changed its App Store Review Guidelines, officially allowing retro gaming console emulators. As a result, apps like in many regions. Why do you still need the IPA file? n64ios ipa
An (.ipa) is the standard file format used to package and distribute applications for Apple's iOS operating system, similar to how .apk files work on Android. Because these emulators are not officially on the
Delta, created by developer Riley Testut, is arguably the most popular and widely recommended emulator for modern iPhones and iPads. It is free, has no in-app purchases, and is available in most regions directly from the App Store. As a result, apps like in many regions
: Delta is the direct evolution of N64iOS and is fully optimized for modern iPhones and iPads.