RetroArch has been ported to tons of platforms, which makes it especially attractive: You can have essentially the same experience on your smartphone, streaming device, games console, mobile and desktop computer, etc. It's highly expandable, using the libreto API, which means that you can emulate anything that can be emulated through it by adding additional libreto cores, which are essentially packaged emulators that then work through the RetroArch UI, which in itself is very customizable as well.
It's trustworthy.Īlternatively, you can use RetroArch, which is generally considered to be the most advanced and powerful emulation frontend that has features you won't find anywhere else: OpenEmu has been around for seven years, the entire source code is on GitHub.
All this means is that the app hasn't been checked by Apple, that's it. You misunderstood the operating system message.