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biodiff vs Hex Fiend: catalog facts
biodiff	Hex Fiend
Free Free and open source under the MIT licence.	Free Free and open source under the two-clause BSD licence.
Windows, Command line	macOS
Aligns insertions and deletions instead of comparing fixed offsets Side-by-side hex view with padding for missing bytes	Opens huge files without loading them into memory Insert and delete bytes, not just overwrite
No GitHub releases published; installed through package managers or built from source Terminal interface only	macOS only Focused on editing rather than full reverse-engineering features
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD-2-Clause
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 1, 2026

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