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Salmon vs Chronal: catalog facts
Salmon	Chronal
Free Free and open source under the MIT licence.	Free Free and open source, with no ads.
Android	Android
Works fully offline on the device No accounts, adverts or subscriptions	Notation editor for hearing written rhythms Two synchronised metronomes for polyrhythms
Young project with a small user base Android only	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
No account needed	No account needed
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.