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Simple Alarm Clock vs Fossify Clock: catalog facts
Simple Alarm Clock	Fossify Clock
Free Free and open source under the Apache-2.0 license.	Free Free and open source under the GPL-3.0, with no ads.
Android	Android
Gradual volume increase and vibration Adjustable snooze controls	Alarm, stopwatch, timer and widget in one app Gradual alarm volume and adjustable snooze
Android only No dock mode or world clock	Android only Covers standard clock features rather than advanced sleep tracking
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	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.