Piano Chord Training

Piano chord practice

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

From “knowing” chords to being able to “play” them at a glance. Chord Trainer is a hands-on training app that helps you derive diatonic triads from a key and scale degree—and master them through actual performance. 【Key Features】 Choose Your Practice Mode: In addition to the standard 10-question mode, Chord Trainer offers sequential and random practice modes. In practice and random modes, keyboard hints guide you to the next note. Visualize Your Weaknesses with Heatmaps: After each session, the app records your first-try accuracy and time to correct answer. Heatmaps by chord and key let you instantly identify your strengths and areas for improvement. MIDI Input Support: Play using either on-screen taps or an external MIDI keyboard. Track and review your results separately for each input method. 【Make Practice Personal—and Fun】 Use coins earned through practice sessions to unlock a variety of characters (HEROes). Take on challenges together and stay motivated every day. Start with free exercises. If you’d like to go deeper, unlock additional exercises with a straightforward one-time purchase.

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- English is now available. - New 4 heroes arrived. Check them out on hero screen.

Version 1.1.0

The developer, tomoyuki koyanagi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • tomoyuki koyanagi
    Size
    • 7.9 MB
    Category
    • Music
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    • English and Japanese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Diatonic chord memorize drill $1.99
    • Chord memorize drill pack $1.99
    • Learn More
    Copyright
    • © 2026 Tomoyuki Koyanagi
  • Privacy Policy