Is there any graphical Binary Diff tool for Mac OS X?

I just discoverd Hex Fiend – love at first sight! Open both binary files then do File > Compare x and y or Shift+cmd+D

Hex Fiend

You could store the hex of each binary in temp files, then compare them with diff. This would give you the visual hex difference.

xxd -c 1 file1 | cut -d ' ' -f 2 > file1.hex
xxd -c 1 file2 | cut -d ' ' -f 2 > file2.hex

diff file1.hex file2.hex

xxd creates a hex dump, and we're telling it to print one byte per line, then cut splits on space and compares the correct column

you could also use od instead of xxd

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