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QRAlarm vs Chrono: catalog facts
QRAlarm	Chrono
Free Free and open source under the GPL 3.0.	Free Free and open source under the GPL 3.0 or later.
Android	Android
Alarm can only be dismissed by scanning a code Works with QR codes and barcodes	Flexible alarm schedules, including date ranges Wake-up tasks such as math problems before dismissing
Android only You need a printed or placed code to scan	Developers describe it as still in development No code changes since January 2025
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
No account needed	No account 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.