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Loupe vs gThumb: catalog facts
Loupe	gThumb
Free Free, developed as part of the GNOME project and supported by donations.	Free Free and open source under the GPL version 2 or later.
Linux	Linux
Fits naturally into the GNOME desktop Shows image metadata alongside the picture	Native GNOME desktop application Works on local folders without a server
Linux only Editing is limited to basic transforms	Linux only No cloud sync or phone backup
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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