There were a few comments here about running AirGap Vault in an Android Emulator or VM.

The security when running AirGap Vault on a mobile device (Android or iOS) comes from the built in secure element hardware chip. It allows for strong encryption that the user can unlock easily using biometrics or the PIN code. If you run AirGap Vault in an emulator, this secure chip will be emulated, so you don't really gain security.