Free Online Music Theory Tools
This hub brings together the music tools that make practice, study, and songwriting faster: chord reference, fretboard diagrams, scale breakdowns, ear training, and interactive instruments — all in the browser.
- Covers guitar, bass, ukulele, piano, and general music theory in one place.
- Useful whether you're learning your first chords or building chord charts for a session.
- Everything runs locally — no signup, no install, no audio latency from the cloud.
Best tools for this workflow
These pages solve the most common jobs inside this topic, from quick checks to copy-ready output.
Chord Finder
Click piano keys to identify any chord. Shows all matching chord names, root, type, and inversion for any combination of notes.
Scale Finder
Select any root and scale type to see all notes, intervals, and a keyboard diagram. Covers 15 scales from major to diminished. Playable.
Guitar Fretboard
Interactive guitar fretboard with all note names across 6 strings and 12 frets. Highlight scales and modes in multiple tunings.
Circle of Fifths
Interactive SVG circle showing all 12 major keys and relative minors. Click any key to see its signature, diatonic chords, and relative minor.
Chords in Keys
All 7 diatonic chords for any key and mode — major, natural minor, and all 5 church modes. Shows Roman numerals and harmonic function.
Chord Transposer
Paste a chord sheet and transpose all chords to any target key instantly. Supports sharps and flats preference.
Lil Beat Maker
8-track step sequencer with 16 or 32 steps. Build drum patterns with kick, snare, hi-hat, and more using Web Audio synthesis.
Piano Chords
Visual piano chord voicings for any root and type. Select from 18 chord types and hear the arpeggio played via Web Audio.
Relative Pitch
Interval ear training. Hear two notes and identify the interval between them. Tracks score, streak, and accuracy across all 12 intervals.
BPM Counter
Tap tempo BPM calculator. Tap any key to the beat and get real-time BPM with Italian tempo name. Auto-resets after 3 seconds.
Browse the related categories
If you want the wider library around this topic, these category pages are the next stop.