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

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