The workspace for curious musicians

Harmony
in motion.

OD HarmoTools makes scales, chords and keys immediately playable, visible and connected.

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Full version, not a demo. Available for unrestricted use; voluntary donations support ongoing development.

For: Musicians & composers
With: Audio, keyboard & MIDI
Access: Unrestricted use

One tool, one instinct

Less theory to look up.
More music to imagine.

HarmoTools brings the essential landmarks of harmony into a calm, precise and unmistakably musical interface.

Harmony, tuning and rhythm in one workspace

Explore. Understand.
Make it sound.

Scales & chords

Build your playground.

Choose a root and a mode, then immediately see the notes, diatonic chords and keyboard come alive. A clear foundation for composing with confidence.

Scale finder

An idea in mind? Find its world.

Select your notes, let HarmoTools reveal candidate scales and open the ones that deserve your ear.

Scales & Chords · Scale Finder

A scale library
built to explore.

Both tools share the same scale library: 52 distinct public scale definitions, including 48 in the full recognition catalogue.

52: public scale definitions
48: recognition candidates
25: exotic scales

Core scales

Major, natural minor, harmonic minor, ascending melodic minor.

Major modes

Ionian, Dorian, Phrygian, Lydian, Mixolydian, Aeolian, Locrian.

Harmonic minor modes

Modes 1 to 7.

Ascending melodic minor modes

Modes 1 to 7.

Pentatonic scales

Major, minor.

Symmetrical & jazz

Whole tone, octatonic whole-half, octatonic half-whole, augmented.

Blues & bebop

Minor blues, major blues, bebop dominant, bebop major, bebop Dorian.

Rare major/minor families

Harmonic major, double harmonic major, Hungarian minor, Ukrainian Dorian, Neapolitan major, Neapolitan minor.

Westernised Eastern colours

Persian, Arabic, Spanish Phrygian, Oriental, Egyptian.

Japanese scales

Hirajoshi, Insen, Iwato, Yo, Kumoi.

Chord name

From symbol to sound, with no detour.

Enter a chord and inspect its material: notes, keyboard voicing and harmonic identity. Perfect for checking an instinct or enriching a progression.

Chord finder

Play the notes. Let the chord speak.

The keyboard becomes a harmony detector: possible names, inversions and spellings appear clearly to speed up your analysis.

Circle of fifths

The map that connects every key.

See key signatures, relative minors and degrees at a glance. Click, listen and change mode, then open the collapsible side panel to build a chord progression directly from the circle.

Pitch CV settings

Match the voltage to your synth.

Choose the Hz/V or V/Oct pitch CV standard, set the voltage assigned to C4 and adjust the A4 tuning reference. The conversions then follow your synthesizer’s pitch settings.

Frequencies & volts

Move between notes, hertz and volts.

Convert a note into its frequency and pitch control voltage, or find the nearest note from a frequency or voltage. Read the tuning offset in hertz and cents using your chosen CV settings.

Reference tone

Give your synth a tuning reference.

Play a reference tone from the selected or nearest note to tune a synthesizer or VCO by ear. Choose the waveform and volume, then apply a new target when you are ready to change the reference pitch.

Ranges

Put your ideas in the right register.

Compare frequency ranges and instrumental tessituras to write with greater accuracy, from the lowest notes to the highest.

Memories · Favourite scales

Your scales, ready whenever you are.

Keep the worlds that inspire you and return to them in one move. Your workspace organises itself around your own tonal palette.

MIDI export

Bring your progressions and sequences into your DAW.

Export chord progressions and Random Sequencer patterns as Standard MIDI Files (format 0) for use in your DAW. You can also transfer memories and sequences directly to Bitwig or Ableton Live with the new drag-and-drop feature shown below.

Direct MIDI drag and drop

From HarmoTools to your DAW in one gesture.

Drag a memory or sequence directly from HarmoTools into Bitwig or Ableton Live. This new feature lets you continue composing in your DAW without going through a temporary MIDI file on disk.

Random sequencer

Let chance write the first draft.

Create evolving patterns from 4 to 64 steps. Use any scale or a custom selection of notes entered with the mouse or a MIDI keyboard, store up to six sequences, then export them as MIDI files for your DAW.

Audio analyzer · Pitch detection

See the note you are playing.

Analyze one note at a time from a microphone, USB microphone or ASIO audio interface. Read its measured frequency, note name and tuning offset in cents from the nearest in-tune note, using an adjustable A4 reference.

Audio analyzer · Spectrum

Find the fundamental in your sound.

Inspect the frequency spectrum in Hz and dBFS, with the detected fundamental marked on the graph. See the harmonics and freeze the spectrum to examine a stable measurement.

Chord sequencer

Let the progression move.

Save your chords, set tempo, gate, strum and instrument. Then hear the progression breathe before taking it further.

Metronome

Hear the beat. Follow the light.

Keep time with an audible beat and a luminous visual pulse. Choose your sound, adjust the accent and volume, and set a pre-roll (count-in) before you start playing. Enter a tempo in BPM or use Tap Tempo to match the rhythm you have in mind.

Playground

Choose a sound. Start playing.

Choose the sound you want and play freely on your MIDI keyboard. When a chord catches your ear, click “Chord Finder” to analyze it. Start the built-in metronome whenever you want a steady beat to accompany your playing.

Audio settings

A workspace that listens to you.

Choose your SoundFont, audio output and preview settings. HarmoTools adapts to your studio, never the other way around.

MIDI & diagnostics

Plug in, play, explore.

Connect a MIDI keyboard, monitor activity and stay in control of the setup. A direct bridge from your fingers to your ideas.

Four new themes

Your workspace, in your light.

Choose from Light, Ivory, Dark and Noir to give HarmoTools the appearance you prefer. Compare the four themes below, then open any screenshot to see it in detail.

About & help

Move forward with the right answers.

The manual travels with the application, so every feature stays approachable — from the first scale to your next progression.

A natural flow

From curiosity
to progression.

01Choose a key
Start with the circle, a scale or a handful of notes.
02Hear the possibilities
Move through chords, notes and colours.
03Keep what sounds right
Save, sequence and play your discoveries.

Download & support

Make music.
Keep it moving.

OD HarmoTools is DonationWare: the complete version is available for unrestricted use, and donations from the people who find it useful sustain its development.