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

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