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

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