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

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