piaco - AI Piano Chord Trainer

piaco is a chord quiz app that helps you build both chord-reading skills and real playing intuition.
Just play the chord shown on the screen, and the app instantly recognizes the sound and checks your answer.
It turns chord study from theory-only practice into a hands-on experience that uses your eyes, ears, and fingers together.

- Key Features

Real-time chord detection
Play chords like C, Em, or G7, and get instant correctness feedback.

Step-by-step quiz modes
Progress from basic triads to seventh and extended chords with increasing difficulty.

Mistake review
Revisit only the questions you missed to improve accuracy.

Focused practice environment
A clean, simple interface that helps you stay fully concentrated.

- Perfect for

• Players who want to speed up chord reading
• Those who want faster reaction time during real performance
• Learners who know the theory but struggle to play smoothly
• Self-taught pianists learning chord-based playing

With just a few minutes of practice each day, you'll feel chords becoming more natural to read—and your hands responding faster—with piaco.