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G'MIC-Qt vs Nik Collection: catalog facts
G'MIC-Qt	Nik Collection
Free Free and open source; the plugin is GPL-3.0 and G'MIC uses the CeCILL licences.	Paid Commercial software from DxO.
Windows, Linux	Windows, macOS
Large library of filters and effects Plugs into GIMP, Krita, Paint.NET and digiKam	Dedicated black and white conversion tools Film look and creative filters
The number of filters can be overwhelming at first Some host integrations are marked as work in progress	Paid software Works as plugins inside other editors
Downloadable app	Downloadable app
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 2, 2026	Official website Full listing and sources Checked September 23, 2026

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