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fend vs Rink: catalog facts
fend	Rink
Free Free and open source.	Free Free and open source, licensed under MPL-2.0 and GPL-3.0.
Command line	Windows, macOS, Linux, Web, Command line
Arbitrary-precision arithmetic Built-in unit handling and conversion	Tracks units through whole calculations Dimensional analysis catches mismatched quantities
Command-line interface only, with no graphical calculator	Repository is in the middle of moving to Codeberg No prebuilt releases listed on GitHub
Downloadable app	Downloadable app, Web application
Open source	Open source
License: MIT	License: MPL-2.0 and GPL-3.0
No account needed	No account 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 2, 2026

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