This is a font developers tool to allow you to visually compare the table contents of font files. Open the program and drag the font files (or folder of font files) on to the window. It can compare a maximum of six files at any one time.
What it Does
The program reads the table record of the font file and displays the contents in a list. Click the headers of the list to change the order of view. It doesn’t do anything other than read and display the tables so don’t think it is changing anything in your font file when you click the headers. It currently reads only TTF and OTF(CFF) font files, not WOFF, WOFF2 or TTC files.

Get the program:

FontTableCompare™ Mac OS/X
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FontTableCompare™ Windows
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FontTableCompare™ Mac OS/X requires a Mac running OS/X 10.6 or above.
FontTableCompare™ Windows requires a PC running Windows XP, 7, 8, 8.1 or 10
You will be asked to confirm that you have read the End User License before you can download the program. Please take a moment to read it, it is not long.