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Hex Fiend vs Synalyze It! Pro: catalog facts
Hex Fiend	Synalyze It! Pro
Free Free and open source under the two-clause BSD licence.	Paid Paid app, sold directly and on the Mac App Store.
macOS	macOS
Opens huge files without loading them into memory Insert and delete bytes, not just overwrite	Automatic decoding of binary structures next to the hex view Grammars can be built interactively in the GUI
macOS only Focused on editing rather than full reverse-engineering features	macOS only Paid software
Downloadable app	Downloadable app
Open source	Closed source
License: BSD-2-Clause	License not stated
No account needed	Not stated if an account is 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.