Piano Companion is a music theory reference app for songwriters, producers, teachers, and students. Look up any of 1,500+ chords or 10,000+ scales instantly, build progressions, and explore harmony on iOS, Android, and Mac.
Whether you're stuck on a progression, blanking on a scale name, or just exploring — Piano Companion gives you the answer in seconds. Press the keys you know, and it tells you what you're playing.
Search by name or tap the keys you know. Piano Companion identifies what you're playing — even from a MIDI keyboard.
The Chord Progression Builder suggests chords that fit your key. Experiment with patterns, listen back, and find what sounds right.
See notes on the grand staff, fingering for both hands, intervals, degrees, and compatible scales — all in context, not abstract textbook diagrams.
1,500+ chords with up to 6th inversions. 10,000+ scales from major and minor to exotic modes. Grand staff notation, fingering for both hands, audio playback.
Don't know the name? Tap the keys — or connect a MIDI keyboard — and Piano Companion finds every matching chord and scale.
Build chord progressions with scale-aware pattern suggestions. Hear them arpeggiated or looped. Export your ideas.
Interactive chord wheel showing compatible chords and key relationships. Navigate harmony visually.
Create custom chords and scales. Organize into libraries and chord charts. Contribute fingerings to the community.
English, Italian, German, Japanese, Russian key notations. Localized in 40+ languages.
See every chord and scale on the staff with treble and bass clef. Notes, degrees, intervals, and fingering for both hands — all at a glance.
Listen to any chord or scale — looped, arpeggiated, or as part of a progression. Hear what you're building before you commit.
Connect an external MIDI keyboard for reverse lookup, composition, or recording. Route MIDI output to your favorite DAW.
Secondary dominants, secondary leading-tones, and common degree names — tonic, supertonic, mediant, subdominant, dominant, submediant, leading tone. See the theory behind every chord.
Browse fingerings contributed by other musicians, or share your own. Build on real playing experience, not just algorithms.
Tap-based composition interface. Lay out your chords, trigger them in real time, and sketch song ideas quickly.
Piano Companion is a music theory reference app that gives musicians instant access to 1,500+ chords with inversions, 10,000+ scales, a chord progression builder, reverse chord lookup, and an interactive circle of fifths. It is available on iOS, Android, and macOS, and supports 40+ languages. Whether you are a beginner learning your first chords or a professional songwriter sketching ideas, Piano Companion provides the answers you need in seconds.
Tap the piano keys you know on screen or connect a MIDI keyboard, and Piano Companion identifies every matching chord and scale in real time. This is especially useful when you hear a chord in a song but don't know its name — just play the notes and the app tells you what they form.
Piano Companion is free to download on iOS, Android, and macOS. The free version includes core chord and scale lookups. A Pro upgrade unlocks additional features including all chord inversions, the full scale library, the chord progression builder, and the circle of fifths tool.
Yes. Connect any MIDI keyboard to your device and Piano Companion will detect the notes you play, identifying chords and scales in real time. This works on iOS (via Camera Connection Kit or Bluetooth MIDI), Android (via USB OTG), and macOS (via USB or Bluetooth).
Piano Companion is available on iPhone, iPad, Android phones and tablets, and macOS. Your chord libraries sync across devices, so you can start on your phone and continue on your Mac.
Available on every major platform. Start exploring chords and scales today.
