About this app
Sonachord is a piano learning app with a chord-focused approach. Follow a guided path of 28 chapters — from your first notes and triads to extended chords, progressions, and ear training. You'll learn how chords look, sound, and work in real music. In the app you can: - Learn piano chords step by step - Practice recognition, recall, and progressions - Train your ear with focused exercises - Play along with the on-screen keyboard, MIDI, or a real piano - Use local acoustic detection through your microphone - Practice offline, with no account required Sonachord is a great fit for beginners, returning players, students, and teachers. Privacy: No account required. Your progress stays on your device. The microphone is used only for local note detection — audio is never recorded, stored, or uploaded. Payment: No subscription. Full access to all chapters and exercises unlocks with a one-time in-app purchase.
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 Sep 7, 2026 · 1:31 AM Free
Screenshots
