TrackComposer
Compose, sketch, and prompt — before you spend a credit.
A free music sketchpad in your browser. Work out the chords, the melody, the groove, and the Suno prompt — and hear all of it — before you ask an AI to render a single take.
One studio, seven rooms
Every page edits something real — a progression, a take, a groove, a prompt. Here is the whole tour, in the order a track tends to happen.
Start with harmony
Explorer
Pick a mood and an archetype and get a real chord progression — then spin variants: tritone substitutions, walk-downs, borrowed chords, modulations. Every variant is a correctly spelled progression you can audition with one click.
- Archetype progressions across nine modes
- Nine theory-aware variation operations
Sketch the notes
Pianoroll
An 88-key grid for one part at a time, with the harmony living under it bar by bar. Scale overlays tint the rows that fit; snap keeps the melody in key — or off it, on purpose.
- Per-bar chords from a key-aware vocabulary
- 21 scale overlays with snap-to-scale
Zoom out
Arrangement
The same project as lanes: every part, the chord lane, a mixer. Import MIDI you already have, export standard MIDI any DAW reads, or let AI-assist compose a take you preview before keeping.
- MIDI import and export
- Per-part gain, mute, and solo
- AI compose with preview-before-apply
Speak Suno
Song Builder
Builds the two Suno text boxes — styles and lyrics — from data-driven kits. Section headers, style tags, and inline chord brackets come out structured and consistent, ready to paste.
Grow the library
Kit Construction
Import and manage variation-kit documents, or have AI generate and convert structured kits. Every kit you keep becomes a starting point in the Song Builder.
Find the groove
Sequencer
16-step drum patterns chained into sections, with swing and a loop transport. Sketch the rhythm the same way you sketched the harmony: fast, audible, disposable.
Choose the sound
Instruments
A SoundFont store: browse, audition, and organize fonts by the thousand, then build custom banks the whole studio plays through.
What makes it work
Two sound engines
A classic Tone.js palette and a full General MIDI synth playing real SoundFonts. Switch per project, mid-session.
Local-first
Everything musical runs in your browser — playback, editing, generation. Your sketches are yours; the hosted Cloud mode is optional.
AI-assist, gated
Compose takes, suggest melodies, generate whole kits. Every proposal is validated and previewed; nothing lands until you apply it.
MIDI in and out
Import the MIDI you have; export standard MIDI files any DAW reads. Your sketch is never trapped here.
Suno-native
Kits compile straight into the two Suno text boxes. Structure first, credits later.
No install
It's a browser app. Open it, play a chord, save a track.
Questions, answered honestly
Is it free?
Yes. Open it and start sketching — composing, playback, and MIDI export cost nothing. The hosted service puts fair-use quotas on storage and the AI-assist features, and that's the whole catch.
Do I need Suno?
No. TrackComposer is a complete sketchpad on its own: chords, melodies, drums, playback, MIDI export. If you do use Suno, the Song Builder turns your sketch into the two prompt boxes — so the credits you spend go to takes whose bones you've already heard.
Does it run locally?
Everything musical — the sound engines, editing, progression generation — runs in your browser; the server's jobs are storing your files and preparing SoundFonts. Local-first is the design rule the whole app is built around.
What's Cloud mode?
app.trackcomposer.com is the hosted version: sign in and your tracks, kits, and SoundFonts follow you between machines. The app behaves identically either way.
Which browsers work?
Current Chrome, Edge, Firefox, and Safari on desktop. It uses WebAudio and WebAssembly, which every modern browser ships. A keyboard and a real screen help — it's a studio, not a feed.
Start sketching. Spend credits when it's worth it.
Open the studio, pick an archetype, and hear a progression in the next sixty seconds.
Open TrackComposer — free