About this app
'Dr.Chord' is the app to assist users to develop their sense of tonality. While singing a tune, users can test the sound of each chord progression just by clicking each chord button on the screen. The app aims to make users acquire more advanced skills as they reproduce the tune they are familiar with. [Sound of each chord] Users will be able to recall the sounds such as Maj7, m7, 7th, sus4, dim, aug etc. just by looking at each chord name. [The function of a chord in a chord progression or in tunes] Users will be able to recall the sound just by looking at the degree name of each chord. [Patterned chord progression] Users will be able to re-harmonize the tune.
Latest release
What’s New
[v2.2] - The English version of "Tutorial" and "How to use" has been released. - The key selection screen has been changed to the 5th circle display. You can also return to the conventional list display from the setting screen. - I moved the instrument selection to the setting screen, and changed it so that the top note setting can be opened from the icon on the upper left instead.
Audience growth
Ratings growth
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 20, 2026 · 7:14 AM Free
Screenshots
