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Koko vs gThumb: catalog facts
Koko	gThumb
Free Free and open source, part of KDE.	Free Free and open source under the GPL version 2 or later.
Linux	Linux
Works on desktop and mobile Linux Regular releases with KDE Gear	Native GNOME desktop application Works on local folders without a server
Linux only Simpler than a full photo manager	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 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.