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