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Hydrus Network vs KPhotoAlbum: catalog facts
Hydrus Network	KPhotoAlbum
Free Free, with source published on GitHub.	Free Free KDE community software.
Windows, macOS, Linux, Self-hosted	Linux
Tag-based search across very large collections Imports files and tags from disk and websites	Fast tagging workflow for large batches of photos Searches combine people, places and custom categories
Takes time to learn compared with ordinary photo libraries Interface is dense and built for power users	Organizes photos rather than editing them Tagging a large archive still takes up-front effort
Downloadable app, Self-hosted	Downloadable app
Closed source	Open source
License: WTFPL	License not stated
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 24, 2026

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