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NFC Alarm Clock vs Lux Alarm: catalog facts
NFC Alarm Clock	Lux Alarm
Free Free with no ads, open source under the GPL-3.0; donations accepted.	Free Free and open source under the GPL-3.0 licence.
Android	Android
NFC tag dismissal makes it harder to switch off alarms in bed Gradually increasing or restricted alarm volume	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 NFC dismissal needs a phone with NFC and a tag or card	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-or-later	License: GPL-3.0-or-later
No account 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 October 2, 2026

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