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Hex Fiend vs biodiff: catalog facts
Hex Fiend	biodiff
Free Free and open source under the two-clause BSD licence.	Free Free and open source under the MIT licence.
macOS	Windows, Command line
Opens huge files without loading them into memory Insert and delete bytes, not just overwrite	Aligns insertions and deletions instead of comparing fixed offsets Side-by-side hex view with padding for missing bytes
macOS only Focused on editing rather than full reverse-engineering features	No GitHub releases published; installed through package managers or built from source Terminal interface only
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause	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 October 2, 2026

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