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gThumb vs qView: catalog facts
gThumb	qView
Free Free and open source under the GPL version 2 or later.	Free Free and open source under the GPL.
Linux	Windows, macOS, Linux
Native GNOME desktop application Works on local folders without a server	Opens essentially instantly, which is what a double-clicked image needs No interface chrome; the window is the image
Linux only No cloud sync or phone backup	No editing, tagging or library management at all Metadata display is minimal
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0
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 21, 2026

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