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Sleep as Android vs Lux Alarm: catalog facts
Sleep as Android	Lux Alarm
Freemium Free to try, with paid features unlocked by purchase.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Smart alarm based on sleep phase tracking Works with phone sensors or wearables	Forces you out of bed to turn on a light before it stops Uses the phone's built-in light sensor, so no extra hardware is needed
Android only Large feature set can take time to configure	Depends on the phone having a working ambient light sensor No formal releases on GitHub; install through F-Droid
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is 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 September 23, 2026	Official website Full listing and sources Checked October 2, 2026

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