An app anyone can enjoy with which you learn to have perfect and relative pitch. Especially suited to those learning the chords of just intonation.
This app is beloved by many, from those who want to be good at karaoke to brass band and orchestra members.

Hello everyone.
This "Music Game" app is the sequel of my previous work.
This time, the focus lies on learning double-stop notes (just intonation).

In this app, two sounds are played at the same time, but the decision is calculated on the basis of just intonation.
For example, when matching major third "do" and "mi", there is a gap of 4 semi-tones, so in equal temperament there is an interval of 400 cents.
However, in just intonation, "mi" has a 5/4 frequency ratio to "do", so when calculated, the interval becomes (1200 x log2 (fE / fC) =) 386.3... cents.
This means that for the piano (equal temperament) interval you have to take a minor interval of approximately -14 cents.
Therefore, use the piano sound only as a guide, and match the tone of the sound by feel.
The trick is to operate it so you lose the beat. It will suddenly become a clear sound at a certain position. That will be the just interval tone.

※Chords reference tone is A=442 Hz.

What’s New

Version 3.6.3


Ratings and Reviews

4.4 out of 5
102 Ratings
102 Ratings
high5ths ,

Would be perfect with some more options :)

I’d like the ability to choose different waveform types for the sound, or mix and match them (one note with a sine wave and another square, for example). It would be great to have more of everything, too!

But this is fun.

Lisa's Novel 2013 ,

I don’t understand how to play.

This could be a good app, but I don’t know. I read the instructions and I still can’t figure out how to play. When my friend was over yesterday, she showed me it and was singing to match the pitch, but the game requires me to move slider. I tried left, right and middle. Sometimes it sounded like the right sound, so I would try it and it was wrong.

J-Busta ,

The best

Honestly, I love how this app operates. I started using it and out of the blue I started to be able to sing harmony. Something about these types of exercises is unique and extremely valuable.


Toshihiko Arai
28.6 MB
Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
Age Rating
Rated 4+
© Toshihiko Arai
In-App Purchases
  1. Remove Ads $3.99


  • Family Sharing

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

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