Compose with algorithms

Build pitch structures, rhythms, and spectral transformations visually

A computer-assisted composition environment inspired by IRCAM's OpenMusic. Spectral, serial, algorithmic, and stochastic techniques — all in your browser.

Spectral

Serial

Algorithmic

Stochastic

Live OSC

Microtonal

Grafer is a computer-assisted composition environment for contemporary music. Build complex pitch structures, intricate rhythms, and spectral transformations through an intuitive visual node graph.

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Visual Node Graph

Drag & Drop Real-time Preview MusicXML Export

Connect compositional processes visually. See results instantly in notation, piano roll, and analysis views. Export to Dorico, Sibelius, or MuseScore.

Complex Rhythms & Tuplets

Nested Tuplets Metric Modulation Polyrhythm

Ferneyhough-style rest insertion, rhythmic proliferation, and polyrhythmic generators. Full MusicXML export with proper notation.

Spectral Morphing & Analysis

Harmonics Formant Filtering 7 Analysis Views

Interpolate between harmonic fields, filter through vocal formants, measure harmonic distance. Saariaho-style timbral trajectories built into the node graph.

Microtonal & Custom Scales

Quarter-tones Custom Scales Pitch Quantization

Quarter-tone quantization, custom scale definitions, and pitch-class set operations. Full support for microtonal notation in MusicXML export.

Compositional approaches

From spectral composition to stochastic processes,
every technique at your fingertips

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Saariaho Harmonics Formants

Spectral Composition — timbral continua and harmonic morphing

Boulez 12-tone Multiplication

Serial & Post-Serial — integral serialism and pitch multiplication

Ferneyhough Nested Tuplets Rhythmic Detail

New Complexity — extreme rhythmic detail and proliferation

Xenakis Markov Brownian

Stochastic & Chaos — Markov chains, Brownian walks, Gaussian / Cauchy draws, Hénon & logistic maps

Phone, AI & synth
in the loop

Capture sounds and tap rhythms on mobile. Let a graph-aware assistant untangle your score. Drive SuperCollider, Max or Pd live from the same graph that produces your notation.

Open the App

Mobile Partial Tracking Field Recording

Sound Recorder — capture audio on the phone, store its spectral fingerprint, and wire the partials into a Spectral Field on desktop

Mobile Rhythm Tree Quantisation

Rhythm Tapper — tap against a metronome, the app quantises to a nested rhythm tree, ready to wire into any Voice

AI Assistant Anthropic Graph-aware

Graph-aware Assistant — reads the node graph of your active cell and answers in terms of it. Bring your own Anthropic key or use the hosted model.

SuperCollider OSC Live

Live OSC Bridge — stream any voice to SuperCollider, Max or Pd as UDP messages. Pitch in midicents, onset and duration in seconds — copy-paste receiver snippet inside the editor.

Simple pricing

Full access to every compositional tool. No feature gates, no limits. Start with a 14-day free trial.

Start Free Trial

COMPOSER PRO

€9/month

14-day free trial included

✓ All 90+ composition nodes

✓ Graph-aware AI composition assistant

✓ Mobile capture tools (Sound Recorder, Rhythm Tapper)

✓ Live MIDI output to any DAW

✓ Spectral morphing & analysis

✓ Counterpoint subsystem (canon, invertible, phase)

✓ Nested tuplets & complex rhythms

✓ MusicXML export

✓ 7 analysis views

✓ Unlimited projects

✓ Microtonal & custom scales

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STUDENTS

€4/month

50% off with valid student email

✓ Everything in Composer Pro

✓ Valid .edu email required

✓ Cancel anytime

Apply Student Discount

INSTITUTIONS

Custom

Volume licensing for universities

✓ Multi-seat licenses

✓ Conservatory & university pricing

✓ Priority support

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