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bcal vs fend: catalog facts
bcal	fend
Free Free and open source under the GPL-3.0-or-later license.	Free Free and open source.
Command line	Command line
Converts between SI and IEC storage units Handles byte addresses and LBA or CHS calculations	Arbitrary-precision arithmetic Built-in unit handling and conversion
Supports 64-bit operating systems only	Command-line interface only, with no graphical calculator
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	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 October 8, 2026	Official website Full listing and sources Checked September 24, 2026

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