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Lux Alarm vs QRAlarm: catalog facts
Lux Alarm	QRAlarm
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the GPL 3.0.
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	Alarm can only be dismissed by scanning a code Works with QR codes and barcodes
Depends on the phone having a working ambient light sensor No formal releases on GitHub; install through F-Droid	Android only You need a printed or placed code to scan
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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