ChartKeys app icon

ChartKeys

Your chill but smart piano jam buddy

Jam along with an auto backing band, based only on chords and style — with detailed stats over time.

Download on the App Store

Free to play, for as long as you like. Pro is a one-time payment.

The ChartKeys play screen: a chords lane showing Bm7, D and F#m7, session controls with tempo and volume, and an onscreen piano keyboard with the chord notes highlighted.

This is not a “beginner, learn piano” app. No falling notes here.

If you are still reading, have a basic understanding of chords like Bm and A7, and maybe even a MIDI keyboard — you might like this.

Whether you want to actively learn, expand your comfort zone and musical vocabulary, or just noodle along and have fun, is completely up to you. No study plan, no tests — only some play stats, if you ever feel curious.

Jam along with an auto backing band

Give it chords and a style. It gives you a band.

  • A three-lane backing band — drums, bass, keys/guitar — with 20 demo loops bundled in
  • Backing styles including pop, rock, jazz/swing, bossa, funk/soul, waltz and shuffle
  • Tempo from 50% to 150%: the band genuinely replays it, no time-stretched weirdness
  • Set your own loudness against the band, and mute any backing instrument you please
  • Choose your instrument: Grand Piano, two E-Pianos, Clavinet, Drawbar Organ, Synth Lead
  • The chords lane follows the beat, with optional highlighting of the chord keys
  • Play on the onscreen keyboard, or over MIDI — wired or Bluetooth

ChartKeys listens to what you play, and roots for you

It describes your journey, and never judges. No scores, no verdicts, no red crosses.

  • A daily activity chart and daily streaks — but no annoying reminders
  • Statistics over time on the chords and intervals you reach for
  • The musical phrases and lines you keep coming back to, spotted across songs
  • Where you land when the chord changes in a solo: the root, 3rd, 5th, 7th, elsewhere
  • The keys you play in, laid out on the circle of fifths
  • Share any of it as an image, if that seems fun or useful
Player Stats screen showing a daily streak, songs played, hours played, and a daily activity grid of green squares.
Daily activity, streaks and hours played — with a painting to keep you company.
“Old friends” stats section: six short musical phrases written on staves, each with how many times it was played and which songs it turned up in.
Old friends: the little phrases you play again and again, noticed across your songs.
Two stacked bar charts by month: “The shape of your months”, breaking down triads, sevenths, dyads and octaves, and “Where you land when the chord changes”, breaking down root, 3rd, 5th, 7th and scale notes.
The shapes you reach for, month by month — and where your solos land on a chord change.

Everything in one songbook

Demo loops, imported playlists and your own loops, together in one place, with search and favorites.

No account, no sign-up, no cloud

  • What you play stays on your device
  • Nothing personally identifying is ever uploaded — not even an install id
  • Works offline

Free to play, Pro if you want more

Free

As long as you like

  • 20 demo loops
  • The full backing band
  • Full player stats
  • All play controls, with no limit

Pro

One-time payment, lifetime

  • Change the backing style of any song
  • Change the key — transpose
  • Edit chords by tap-and-hold, right in the chords lane
  • Create your own chord charts, up to 16 bars
  • Import thousands of charts found online by copy-paste, irealb:// compatible
  • Export your charts by copy-paste

Ready for a jam?

Download on the App Store