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GNU Units vs fend: catalog facts
GNU Units	fend
Free Free software under the GPL, part of the GNU Project.	Free Free and open source.
Windows, Command line	Command line
Handles nonlinear conversions such as temperature and wire gauge Converts to and from sums of units like feet plus inches	Arbitrary-precision arithmetic Built-in unit handling and conversion
Command-line only, with no graphical interface Takes some learning to write complex expressions	Command-line interface only, with no graphical calculator
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
No account 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 September 24, 2026

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