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

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