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Chrono vs Fossify Clock: catalog facts
Chrono	Fossify Clock
Free Free and open source under the GPL 3.0 or later.	Free Free and open source under the GPL-3.0, with no ads.
Android	Android
Flexible alarm schedules, including date ranges Wake-up tasks such as math problems before dismissing	Alarm, stopwatch, timer and widget in one app Gradual alarm volume and adjustable snooze
Developers describe it as still in development No code changes since January 2025	Android only Covers standard clock features rather than advanced sleep tracking
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
No account 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.