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GNU Units vs eva: catalog facts
GNU Units	eva
Free Free software under the GPL, part of the GNU Project.	Free Free and open source under the MIT licence.
Windows, Command line	Windows, macOS, Linux, Command line
Handles nonlinear conversions such as temperature and wire gauge Converts to and from sums of units like feet plus inches	Interactive REPL or one-off expressions from the command line Syntax highlighting and persistent history
Command-line only, with no graphical interface Takes some learning to write complex expressions	No packaged releases on GitHub A plain calculator, not a full programming language like bc
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 October 2, 2026

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