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fend vs GNU Units: catalog facts
fend	GNU Units
Free Free and open source.	Free Free software under the GPL, part of the GNU Project.
Command line	Windows, Command line
Arbitrary-precision arithmetic Built-in unit handling and conversion	Handles nonlinear conversions such as temperature and wire gauge Converts to and from sums of units like feet plus inches
Command-line interface only, with no graphical calculator	Command-line only, with no graphical interface Takes some learning to write complex expressions
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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