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gThumb vs Koko: catalog facts
gThumb	Koko
Free Free and open source under the GPL version 2 or later.	Free Free and open source, part of KDE.
Linux	Linux
Native GNOME desktop application Works on local folders without a server	Works on desktop and mobile Linux Regular releases with KDE Gear
Linux only No cloud sync or phone backup	Linux only Simpler than a full photo manager
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License not stated
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 24, 2026

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