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Hex Fiend vs Free Hex Editor Neo: catalog facts
Hex Fiend	Free Hex Editor Neo
Free Free and open source under the two-clause BSD licence.	Freemium Basic editing is free; advanced features require a paid edition.
macOS	Windows
Opens huge files without loading them into memory Insert and delete bytes, not just overwrite	Handles very large files and disks Unlimited undo and redo with saved operation history
macOS only Focused on editing rather than full reverse-engineering features	Windows only Advanced features are reserved for paid editions
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-2-Clause	License: Freeware
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.