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fend vs Modular Calculator: catalog facts
fend	Modular Calculator
Free Free and open source.	Free Free and open source under GPL-3.0-or-later.
Command line	Linux
Arbitrary-precision arithmetic Built-in unit handling and conversion	Handles variables, functions, units and arrays Supports calculations with numbers in different bases
Command-line interface only, with no graphical calculator	Linux is the only listed platform
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
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 October 8, 2026

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