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Diatronome vs Chronal: catalog facts
Diatronome	Chronal
Free Free and open source under GPL-3.0-or-later.	Free Free and open source, with no ads.
Android	Android
Combines a tuner, metronome and synthesizer Supports adjustable pitch and transposition	Notation editor for hearing written rhythms Two synchronised metronomes for polyrhythms
Android only	Android only Licence information differs between the repository and the F-Droid listing
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	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 8, 2026	Official website Full listing and sources Checked October 2, 2026

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