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TagStudio vs Damselfly: catalog facts
TagStudio	Damselfly
Free Free and open source with no paid tier.	Free Free to use; the developer accepts donations through Buy Me a Coffee.
Windows, macOS, Linux	Web, Self-hosted
Tag-based organization on top of your existing files Does not lock files into a proprietary format	Works on an existing folder-based photo collection Face, object detection and image classification built in
Still evolving, so features and library format may change Organizing a large collection with tags takes manual effort	Full facial recognition depends on an Azure Face Services account Needs a server to run
Downloadable app	Self-hosted
Open source	Closed source
License: GPL-3.0	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 October 1, 2026	Official website Full listing and sources Checked September 23, 2026

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