ArgyllCMS vs GMG ColorProof

ArgyllCMS is a free, open-source ICC-compatible color management system for creating profiles and calibrating devices. Its command-line tools support scanners, cameras, film recorders, displays, and RGB, CMY and CMYK printers. It can create device-link profiles with options such as video calibration standards and 3D LUTs, and work with spectral samples, selectable illuminants and observer types, and paper fluorescent-whitener compensation. Color conversion tools handle 8-bit raster data and fully accurate 16-bit conversion. Documentation lists direct support for measurement instruments from JETI, Klein, X-Rite and Calibrite, DataColor and other manufacturers; some chart results can be converted into Argyll CGATS format. ArgyllCMS runs on Windows, macOS and Linux, but does not include a graphical interface. DisplayCAL, The Little Argyll GUI and CoCa are listed as front ends that use it. The package is licensed under AGPLv3; commercial licensing is available for code copyrighted by Graeme Gill through ArgyllPRO. On Linux, native display calibration and profiling under Wayland are not currently supported; the maker recommends X11 for color-managed displays.

GMG ColorProof has no write-up on Specifiction yet; its figures are above.