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Hydrus Network vs IMatch: catalog facts
Hydrus Network	IMatch
Free Free, with source published on GitHub.	Paid Commercial software sold by photools.com.
Windows, macOS, Linux, Self-hosted	Windows
Tag-based search across very large collections Imports files and tags from disk and websites	Standard-compliant metadata management Catalogs RAW, video, audio, PDF and Office files
Takes time to learn compared with ordinary photo libraries Interface is dense and built for power users	Windows only Paid software
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.