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Numbat vs fend: catalog facts
Numbat	fend
Free The open-source application is available without a license fee.	Free Free and open source.
Windows, macOS, Linux	Command line
Unit-aware calculations with dimension checking	Arbitrary-precision arithmetic Built-in unit handling and conversion
Requires learning its expression and language syntax.	Command-line interface only, with no graphical calculator
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 24, 2026

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