The 1.4 version of HarmonEye for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac app is an intellectual property of Bohumír Zámečník. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. HarmonEye for Mac is categorized as Audio & Video Tools.
From the developer:
HarmonEye is a unique software application that listens to the music, applies some deep math under the hood and shows you the tones and chords being played. The intensity of each tone in an octave is shown as a segment of a circle (like on the clock). A loud tone makes a long red segment.