1. SW True-Fi (Android) is a sound-enhancing app that attempts to enhance your listening experience. Customization can be based on headphones and listener's own age and unique hearing.


2. Metronome Plus (iOS) is a very pretty, very clean metronome for you iOS musicians out there.


3. Scythe (iOS) is a very cool, powerful, and flexible synth for iOS. Supports MIDI and inter-app-audio so you can instantly fit it into your workflow.