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CopyQ vs Diodon: catalog facts
CopyQ	Diodon
Free Free and open source under the GPL 3.0.	Free Free and open source.
Windows, macOS, Linux	Linux
Stores text, images, HTML and custom formats, not just plain text Tabs, tags, notes and filtering for a history you actually use	Available in the Debian and Ubuntu repositories Lightweight GTK application
The interface is functional rather than attractive Scripting is where the power is, and that means learning its API	In low maintenance mode with no new features planned Built around the Unity desktop
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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