ChartKeys: Backing Tracks

Jam on piano with a backing band that follows your chord chart. Explore ideas, practice improvisation, or just enjoy playing — then discover patterns in your playing over time.

Start free with 20 demo loops, drums, bass, and keys/guitar accompaniment. Play with the onscreen keyboard or connect a MIDI keyboard, wired or over Bluetooth.

ChartKeys is for players who know basic chords and want room to explore. Follow your curiosity, with no study plan, tests, or scores.

The free version includes all 20 demo loops, backing playback, tempo and mixer controls, and full playing statistics, with no time limit. A one-time Pro purchase unlocks chart import, chord editing, transposition, and backing-style changes.

No account or sign-up. Works offline. Your playing stays on your device.

* Jam along with an auto backing band, based only on chords and style
- 20 bundled demo loops
- three-lane backing band: drums, bass, keys/guitar
- backing styles including pop, rock, jazz/swing, bossa, funk/soul, waltz, shuffle, etc.
- adjust tempo as you like (50-150%, the band replays it, no time-stretched weirdness)
- adjust your loudness relative to the band as you like
- mute each backing instrument as you please
- choose your instrument: Grand Piano, E-Piano x2, Clavinet, Drawbar Organ, Synth Lead
- chords lane follows the beat
- optional chord keys highlighting
- onscreen keyboard or MIDI (wired/Bluetooth)

* ChartKeys listens to what you play, and roots for you!
- daily activity chart, daily streaks, optional reminders
- statistics over time on your common chords, intervals
- detects your commonly used musical phrases/lines across songs
- shows where you land on chord changes in solos (root, 3rd, 5th, 7th, etc.)
- the keys you play in, laid out on the circle of fifths
- describes your journey, never judges: no scores, no verdicts, no red crosses
- share your stats conveniently as images if that seems fun or useful

* Everything in one songbook
- demo loops, imported playlists and your own loops, 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

* Play the free version as long as you like
- 20 demo loops, full backing, full player stats, play controls included with no limit

* Unlock lifetime Pro features with a one-time payment
- change backing style for any song
- change song key (transpose)
- edit chords (tap and hold directly in the chords lane)
- create your own chord charts (basic editor, up to 16 bars, fixed grid of chords to edit)
- import thousands of chord charts available online via copy-paste (irealb:// compatible)
- export your chord charts via copy-paste