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Qopy vs Diodon: catalog facts
Qopy	Diodon
Free Free to download; source published on GitHub.	Free Free and open source.
Windows, macOS, Linux	Linux
Runs on Windows, macOS and Linux Builds for arm64 Windows and Apple Silicon	Available in the Debian and Ubuntu repositories Lightweight GTK application
Younger project with a smaller community than established tools No mobile apps	In low maintenance mode with no new features planned Built around the Unity desktop
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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