Free & Open Source

Music theory tools
for every platform.

Detect and generate chords, explore the circle of fifths, practice scales, use the metronome — on the web, your phone, or your desktop.

Open web app Explore all apps
🎹 Chord detection
🎵 Interval detection
🎸 Guitar chords
⭕ Circle of fifths
🎼 Scales
🥁 Metronome
🎛️ MIDI input
🌐 English / Español
🆓 Always free
Apps

One tool suite, every platform

🌐
Web App
The full tool suite in your browser — no installation required. Detect chords and intervals, generate piano and guitar chords, interactive circle of fifths, scales, and metronome. MIDI keyboard optional.
Open →
📱
Mobile App
Take FreeMIDIChords anywhere. Same chord tools and circle of fifths, optimized for touch on iPhone, iPad and Android.
iOS App Store Google Play
💻
Desktop App
A native desktop experience for Mac, Windows and Linux. Full chord and scale toolkit with MIDI input, audio engine, and staff notation — no browser needed.
Mac App Store Windows (Microsoft Store) Linux (.deb)
🎹
PianoPilot
Roland FP-30X
A dedicated desktop controller for the Roland FP-30X digital piano. Edit tones, metronome, transpose, Piano Designer, and note voicing from a full-screen interface over USB or Bluetooth.
Learn more →
Screenshots

See it in action

Chord detection
Chord Detection
Chord generation
Chord Generation
Guitar chords
Guitar Chords
Scales
Scales

Ready to play?

The web app works right now in your browser — no account, no download, no ads.

Open FreeMIDIChords →
💛

Support the project

This project is designed to stay free and ad-free forever. Your support helps cover development, maintenance, infrastructure, and support time.

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💬

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Have a suggestion or found a bug? We read every message and use it to keep improving.