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Synalyze It! Pro vs Hex Fiend: catalog facts
Synalyze It! Pro	Hex Fiend
Paid Paid app, sold directly and on the Mac App Store.	Free Free and open source under the two-clause BSD licence.
macOS	macOS
Automatic decoding of binary structures next to the hex view Grammars can be built interactively in the GUI	Opens huge files without loading them into memory Insert and delete bytes, not just overwrite
macOS only Paid software	macOS only Focused on editing rather than full reverse-engineering features
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: BSD-2-Clause
Not stated if an account is 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.