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Lux Alarm vs Sleep as Android: catalog facts
Lux Alarm	Sleep as Android
Free Free and open source under the GPL-3.0 licence.	Freemium Free to try, with paid features unlocked by purchase.
Android	Android
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	Smart alarm based on sleep phase tracking Works with phone sensors or wearables
Depends on the phone having a working ambient light sensor No formal releases on GitHub; install through F-Droid	Android only Large feature set can take time to configure
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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