Key Codes is a little utility that displays the key code, unicode value, and modifier keys state for any key combination you press. If you're a developer, this might be useful to you.

What’s New

Version 2.1

Added a popover that breaks modifier flags down into known constants and their values.

Ratings and Reviews

4.7 out of 5
20 Ratings

20 Ratings

dancingbrook ,

Many Tricks Does Great Stuff!!!

I just discovered these folks as a company and they are both good and serious (no junk, but sometimes a little fun tossed in). I am trying their apps now (an option if you go to their website) and their apps are great (so far). Just discovered they are also on the App Store, so I came here to write a review.

They only need to improve the abiltiy to understand all the features of their apps. Every app should have a modest but decent manual, perhaps along with some good brief videos, that explain (not just show) what the apps can do. FAQs are not a substitute for a manual.

brian.mcgroarty ,

Solved a maddening macOS puzzle

This helped me discover that when macOS system preferences remap a modifier key to Option, it actually remaps to Right-Option, not Left-Option.

This resolved some frustrating behavior when using Parallels, as for some reason Alt Tab was misbehaving... it's because Apple had me unwittingly sending Right-Alt Tab, which changes the behavior of the task switcher. I just had to add a registry hack to remap Right-Alt as Left-Alt to make Windows work properly again.

I'd still be pulling my hair out and trying to figure out what was wrong if not for this free tool. Thank you so much!

wbevins ,

Must Have!

This app has saved me so much time across several projects. Would have no problem paying $5+ for this. Great job!


Many Tricks
2 MB

OS X 10.7 or later



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.