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Qrca vs Decoder: catalog facts
Qrca	Decoder
Free Free and open source under the GPL-3.0+.	Free Free and open source under the GPL-3.0-or-later licence.
Linux, Android	Linux
Both scans and generates QR codes Runs on Linux desktops and Android	Scans from a camera or a screenshot Generates QR codes as well as reading them
Scanning needs a camera Narrow single-purpose tool	Linux only Focused on QR codes rather than other barcode types
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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