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Hex Fiend vs HxD: catalog facts
Hex Fiend	HxD
Free Free and open source under the two-clause BSD licence.	Free Freeware at no cost.
macOS	Windows
Opens huge files without loading them into memory Insert and delete bytes, not just overwrite	Edits raw disks and RAM as well as files No limit on file size
macOS only Focused on editing rather than full reverse-engineering features	Windows only Closed source
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.