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Tuning fork vs Chronal: catalog facts
Tuning fork	Chronal
Free Free and open source under the MIT licence.	Free Free and open source, with no ads.
Android	Android
Plays a reference tone on demand Simple and focused on tuning by ear	Notation editor for hearing written rhythms Two synchronised metronomes for polyrhythms
No visual pitch detection like a chromatic tuner	Android only Licence information differs between the repository and the F-Droid listing
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.