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Simple Alarm Clock vs Chrono: catalog facts
Simple Alarm Clock	Chrono
Free Free and open source under the Apache-2.0 license.	Free Free and open source under the GPL 3.0 or later.
Android	Android
Gradual volume increase and vibration Adjustable snooze controls	Flexible alarm schedules, including date ranges Wake-up tasks such as math problems before dismissing
Android only No dock mode or world clock	Developers describe it as still in development No code changes since January 2025
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: GPL-3.0-or-later
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.