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Flickr Uploadr vs Mimick: catalog facts
Flickr Uploadr	Mimick
Paid Requires a paid Flickr Pro subscription.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS	Linux
Uploads an entire photo collection in bulk Reads from local folders, hard drives, iPhoto and Dropbox	Background folder sync to Immich with an offline queue Native GTK4 and libadwaita interface
Only available with Flickr Pro Uploads only to Flickr	Requires your own Immich server Linux only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-or-later
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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