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Okteta vs Hex Fiend: catalog facts
Okteta	Hex Fiend
Free Free and open source, licensed under GPL-2.0 or GPL-3.0.	Free Free and open source under the two-clause BSD licence.
Linux	macOS
Structures tool for decoding binary formats with custom definitions Built-in checksum and hash calculator	Opens huge files without loading them into memory Insert and delete bytes, not just overwrite
Best integrated with a KDE Plasma desktop Project wiki page is not kept up to date	macOS only Focused on editing rather than full reverse-engineering features
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0 OR GPL-3.0	License: BSD-2-Clause
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 1, 2026

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