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Hydrus Network vs Photo Supreme: catalog facts
Hydrus Network	Photo Supreme
Free Free, with source published on GitHub.	Paid Paid software with a 30-day free trial and no credit card required.
Windows, macOS, Linux, Self-hosted	Windows, macOS, Linux
Tag-based search across very large collections Imports files and tags from disk and websites	Handles very large catalogs Keeps your existing folders and metadata
Takes time to learn compared with ordinary photo libraries Interface is dense and built for power users	Paid after the 30-day trial Focused on cataloging rather than editing
Downloadable app, Self-hosted	Downloadable app
Closed source	Closed source
License: WTFPL	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it 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.