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GNU Units vs Rink: catalog facts
GNU Units	Rink
Free Free software under the GPL, part of the GNU Project.	Free Free and open source, licensed under MPL-2.0 and GPL-3.0.
Windows, Command line	Windows, macOS, Linux, Web, Command line
Handles nonlinear conversions such as temperature and wire gauge Converts to and from sums of units like feet plus inches	Tracks units through whole calculations Dimensional analysis catches mismatched quantities
Command-line only, with no graphical interface Takes some learning to write complex expressions	Repository is in the middle of moving to Codeberg No prebuilt releases listed on GitHub
Downloadable app	Downloadable app, Web application
Open source	Open source
License: GPL-3.0-or-later	License: MPL-2.0 and GPL-3.0
No account needed	No account 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 October 2, 2026

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