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Fotocx vs gThumb: catalog facts
Fotocx	gThumb
Free Free and open source under the GPL version 3.	Free Free and open source under the GPL version 2 or later.
Linux	Linux
Editor and collection manager in one program No tracking or advertisements	Native GNOME desktop application Works on local folders without a server
Linux only Small, single-developer project	Linux only No cloud sync or phone backup
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-2.0-or-later
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.