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Hex Fiend vs Reverse Engineers' Hex Editor: catalog facts
Hex Fiend	Reverse Engineers' Hex Editor
Free Free and open source under the two-clause BSD licence.	Free Free and open source under GPL-2.0.
macOS	Windows, macOS, Linux
Opens huge files without loading them into memory Insert and delete bytes, not just overwrite	Designed around reverse engineering work Extensible with Lua plugins
macOS only Focused on editing rather than full reverse-engineering features	More than a casual user needs for simple byte edits
Downloadable app	Downloadable app
Open source	Open source
License: BSD-2-Clause	License: GPL-2.0
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.