KeyCastr
https://gyazo.com/c61f47425e7b0a273680db9bc0400cff
GitHub - keycastr/keycastr: KeyCastr, an open-source keystroke visualizer
Mac
でキー入力を表示するためのアプリ
デモはコレ
https://gyazo.com/5cf213730e2c29f329b6482bc35cca54 https://gyazo.com/5cf213730e2c29f329b6482bc35cca54