WinHex is not available for Mac but there are some alternatives that runs on macOS with similar functionality. The best Mac alternative is wxHexEditor, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to WinHex and ten of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to WinHex are 010 Editor (Paid), Hex Fiend (Free, Open Source), Synalyze It! (Paid) and Kaitai Struct (Free, Open Source).
010 Editor is a professional text/hex editor designed to edit any file, drive, or process on your machine. Using Binary Templates technology, 010 Editor allows a binary file to be parsed into a data structure that can be understood.
A fast and clever open source hex editor for Mac OS X. Instantly insert, delete, rearrange, even on large files. It works with huge files as large as 118 GB. It has a small footprint, and includes Fast Searching
HextEdit is a fast and lightweight hex editor for viewing and editing binary data. Quickly edit virtually any file type at a low level in a simple and native app. It features fast incremental find, a byte inspector and generally fast performance as a native app.
The Hex Editor From Hell! Hecate is a terminal hex editor that, instead of putting the (ASCII) representation of bytes way out on the right side of the screen, it puts the interpreted values directly beneath the hex representation.
DHEX is a more than just another hex editor: It includes a diff mode, which can be used to easily and conveniently compare two binary files. Since it is based on ncurses and is themeable, it can run on any number of systems and scenarios.