ftxdiff

Compare differences between two fonts. More information: https://developer.apple.com/fonts.

Output differences to a specific text file:

ftxdiff --output {{path/to/fontdiff_file.txt}} {{path/to/font_file1.ttc}} {{path/to/font_file2.ttc}}

Include glyph names in output:

ftxdiff --include-glyph-names

Include unicode names in output:

ftxdiff --include-unicode-names