The Mikme iOS Recording App is compatible with all iOS devices with a 64-bit processor. This includes the iPhone 5S and upward as well as the iPad Air and iPad mini 2 upwards. Please see this list to see if your iOS device has a 64-bit processor and is compatible:
http://blakespot.com/ios_device_specifications_grid.html
Please get the newest version of the Mikme Audio Recording App on the AppStore
Happy Creating!