Easy-to-use cello tuner (free version)
To use:
- Start the app.
- Pluck each string.
- The app will now show you which strings needs tuning and in which direction.

Notes:
- The settings do nothing (all suggestions welcome).
- The app is for free for now, as we're still not 100% happy with the detection, which is trickier than for a violin due to the low notes. A later/better version (with improved/stable detection) will be released later (expected price: 1£).