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PhotoQt vs gThumb: catalog facts
PhotoQt	gThumb
Free Free and open source. The developer asks that you consider donating to humanitarian relief…	Free Free and open source under the GPL version 2 or later.
Linux	Linux
More than 140 image formats, plus photo spheres, motion photos and Apple live photos Embedded and interactive maps for images with GPS data	Native GNOME desktop application Works on local folders without a server
Image manipulation is per-session only; it is a viewer, not an editor Some features need extension packages that not every installer includes	Linux only No cloud sync or phone backup
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0	License: GPL-2.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 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.