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Genius vs fend: catalog facts
Genius	fend
Free Free and open source under the GPL-3.0 licence.	Free Free and open source.
Linux	Command line
Arbitrary precision integers and rational numbers Broad coverage of linear algebra, number theory and statistics	Arbitrary-precision arithmetic Built-in unit handling and conversion
Symbolic calculation is very limited Linux only	Command-line interface only, with no graphical calculator
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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