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Damselfly vs PiGallery2: catalog facts
Damselfly	PiGallery2
Free Free to use; the developer accepts donations through Buy Me a Coffee.	Free Free to download and run.
Web, Self-hosted	Web, Self-hosted
Works on an existing folder-based photo collection Face, object detection and image classification built in	Follows your existing folder layout Runs well on a Raspberry Pi
Full facial recognition depends on an Azure Face Services account Needs a server to run	Gallery rather than a full photo backup solution Needs a server to run
Self-hosted	Self-hosted
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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