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Fossify Clock vs Cuppa: catalog facts
Fossify Clock	Cuppa
Free Free and open source under the GPL-3.0, with no ads.	Free Free and open source under the BSD-3-Clause licence.
Android	Android, iOS
Alarm, stopwatch, timer and widget in one app Gradual alarm volume and adjustable snooze	Quick to start a timer Available on Android and iOS
Android only Covers standard clock features rather than advanced sleep tracking	Single purpose app Few features beyond timing
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: BSD-3-Clause
No account needed	No account needed
Not stated if it works offline	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.