JamBuddy for Android.
Real-time chord detection with neural network pitch detection. See chords on an interactive Circle of Fifths, get next-chord predictions, browse chord charts for guitar, mandolin, ukulele, or bass. Slow audio down without changing pitch, loop tricky sections, record ideas, and transcribe melodies to ABC notation. Keep your sheet music, lyrics, and backing tracks in one offline place—with a built-in tuner and metronome. No accounts, no subscriptions, no ads.
Built by a musician who wanted real practice tools without monthly fees. One purchase, full access forever.
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Three Windows, Everything You Need
A live Circle of Fifths that rotates to show the current key at 12 o'clock and highlights detected chords. Seven visualization modes including histogram, spectrogram, and timeline. Five practice tools. A complete tunes library with sheet music, tabs, lyrics, and audio—all arranged in customizable layouts.
Listen
Real-time chord detection via CREPE neural network. See chord root, quality, and bass note on an interactive Circle of Fifths with next-chord predictions based on music theory.
Learn
Precision chromatic tuner, visual metronome with strum patterns (20-300 BPM), and audio slowdown from 5% to 250% without pitch change. Loop sections, record takes, and track progress.
Play
Thousands of tunes included: Irish Session Top 100, Roaring Jelly Old-Time, Nigel Gatherer, Mandolin Café Bluegrass, OpenHymnal. Import ABC, PDFs, images, audio. Transpose, print sheet music, and render tablature.
See JamBuddy in Action
Real-Time Chord Recognition
Live chord detection with Circle of Fifths visualization showing key relationships and chord progressions.
Next Chord Predictions
See four likely next chords with fingering charts for your instrument.
Sheet Music & Tablature
ABC notation rendered as sheet music with optional guitar, mandolin, or ukulele tablature.
Audio Slowdown & Looping
Slow down audio without changing pitch, set loop markers, and save practice sections.
Chromatic Tuner
Precise chromatic tuner with visual feedback for all stringed instruments.
Multi-Instrument Chord Charts
Browse chord fingerings for guitar, ukulele, mandolin, bass, and more.
Thousands of Tunes Included
Irish Session Top 100, Bluegrass standards, Old-Time favorites, and more—all included free.
Live Transcription
Play a melody and watch it transcribe to ABC notation in real-time.
Flexible Two-Window Layouts
Combine any two windows in stacked or side-by-side arrangements.
Fretboard Visualization
Watch notes light up on the fretboard as chords are detected.
Everything Included
Every feature built for real practice needs. Here's what you get.
Circle of Fifths + Key Lock
See detected chords in context, pin a key when the band settles in, and reset instantly with a tap.
Chord Histogram & Visualizers
Switch between histogram, spectrogram, waveform, heatmap, and timeline to see what the detector hears.
Next Chord + Fingering Cards
See four likely chords, complete with the right fingering chart for guitar, uke, mando, baritone, or bass.
Tunes Browser & Set Lists
Filter by key, groove, or genre, jump into ABC charts, lyrics, PDFs, and keep track-specific notes in one place.
Audio Player & Recorder
Attach your own tracks, adjust tempo, set named loops, or capture ideas with the built-in recorder.
Themes, Layouts & Focus Mode
Dial in font scaling, theme colors, focus layouts, and window order so the info you need is always on top.
🎯 Real-time clarity
Chord names, key confidence, note histogram, and next-chord hints stay in sync with what you hear.
🎧 Works with whatever’s playing
Phone mic, Bluetooth speaker, or saved MP3—JamBuddy listens, slows down, and loops without needing the cloud.
🎸 Multi-instrument grip
Instant chord charts for guitar, ukulele, mandolin, baritone uke, and bass, plus a tuner that handles them all.
🗂️ Local songbook
Keep ABC charts, lyrics, PDFs, audio, and notes together. Filter by key, groove, or vibe in a tap.
🔧 Tweakable detection
Adjust confidence thresholds, bass boost, and rolling history so the detector matches your instrument and room.
� Built by one musician
No venture funding, no pushy upsells—just a side-hustle app updated after jams and before work.
A quick note from the builder
I’m Steve, the developer of JamBuddy. JamBuddy started as a neat python tool to match chords to templates via FFT. It became a way to learn Kotlin at the same time as mandolin and eventually evolved into a full-fledged app. All the things in it are there because I thought they'd help me learn or play better with others. If you find a bug or need a tweak, you’re emailing the person who built the thing.
Ready to Jam Smarter?
Grab JamBuddy, fire up a playlist, and let the Circle of Fifths, chord charts, loops, and recorder keep pace with you.
Available now • Android 12.0+ • One-time purchase • Free updates whenever I get another weekend