The 1.4.317 version of PianoCompanion 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.
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. The application belongs to Audio & Video Tools. This free Mac application is an intellectual property of Songtive.
From the developer:
Piano Companion is a music theory app which helps songwriters, producers, teachers and their students. It is a flexible piano chords and scales dictionary with reverse mode. If you can’t remember the name of a piano chord or scale, this app helps you to find it by keys. The Piano Companion app shows chord and scale notes on the grand staff, degrees, intervals, fingering for both hands in major and minor scales.
You may want to check out more software for Mac, such as CROSS-DJ, Radiologik DJ or AmpliTube Metal, which might be related to PianoCompanion.