I think I remember reading some time ago that an iOS app could use about 60% of the total memory (that would be 3GB for a 5GB iPhone). But on some devices (16GB

I think I remember reading some time ago that an iOS app could use about 60% of the total memory (that would be 3GB for a 5GB iPhone). But on some devices (16GB M1/M2 iPad Pro) you can go beyond 60%.