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IMatch vs Hydrus Network: catalog facts
IMatch	Hydrus Network
Paid Commercial software sold by photools.com.	Free Free, with source published on GitHub.
Windows	Windows, macOS, Linux, Self-hosted
Standard-compliant metadata management Catalogs RAW, video, audio, PDF and Office files	Tag-based search across very large collections Imports files and tags from disk and websites
Windows only Paid software	Takes time to learn compared with ordinary photo libraries Interface is dense and built for power users
Downloadable app	Downloadable app, Self-hosted
Closed source	Closed source
License not stated	License: WTFPL
Not stated if an account is needed	No account needed
Not stated if it 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.