What are some alternatives?
When comparing NanoStudio and Ableton, you can also consider the following products
G-Stomper Studio - G-Stomper Studio is a feature-packed, mobile music production tool.
Sampulator - Make (and record) beats on your keyboard
AudioKit Synth One - Free & Open-source iPhone/iPad Synth 🎹
KORG Gadget - KORG Gadget - From iOS to Mac. Music production software to help your musical imagination become reality.
Splice Beat Maker - Make and share beats in your browser
Music Maker Studio - Android app to make music and write songs with a multi track Midi sequencer.