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Hydrus Network vs digiKam: catalog facts
Hydrus Network	digiKam
Free Free, with source published on GitHub.	Free Free and open source, part of the KDE community.
Windows, macOS, Linux, Self-hosted	Windows, macOS, Linux
Tag-based search across very large collections Imports files and tags from disk and websites	Handles libraries of more than 100,000 images without falling over Face detection and tagging to find photos of specific people
Takes time to learn compared with ordinary photo libraries Interface is dense and built for power users	A large, complex application with a correspondingly steep learning curve Its editor is capable but not a substitute for a dedicated raw developer
Downloadable app, Self-hosted	Downloadable app
Closed source	Open source
License: WTFPL	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 20, 2026

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