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G'MIC vs nip4: catalog facts
G'MIC	nip4
Free Free and open source under the CeCILL licenses.	Free Free and open source under the GPL-2.0 licence.
Windows, Web, Command line	Windows, Linux
Several interfaces: command line, GIMP and Qt plug-ins, web service and C++ library Large set of image filters that can be scripted	Spreadsheet model recalculates dependent images when an input changes Built on the fast libvips image library
Command-line syntax takes time to learn Not a standalone painting or layer-based editor	No releases published on the GitHub repository Suited to processing pipelines rather than ordinary photo retouching
Downloadable app, Web application	Downloadable app
Open source	Open source
License: CECILL-2.1	License: GPL-2.0
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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