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Fossify Clock vs Simple Alarm Clock: catalog facts
Fossify Clock	Simple Alarm Clock
Free Free and open source under the GPL-3.0, with no ads.	Free Free and open source under the Apache-2.0 license.
Android	Android
Alarm, stopwatch, timer and widget in one app Gradual alarm volume and adjustable snooze	Gradual volume increase and vibration Adjustable snooze controls
Android only Covers standard clock features rather than advanced sleep tracking	Android only No dock mode or world clock
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: Apache-2.0
No account needed	Not stated if an account is 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 8, 2026

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