SUS4 Sketchpad

Hum a melody, get MIDI. Lyric assist on-device — nothing leaves your phone.

Hum the melody. Get the MIDI sketch.

Musical ideas come in moments — a melody you are humming in the kitchen, a chord sequence that surfaced while you were noodling before practice, a lyric fragment that arrived before the tune did. SUS4 Sketchpad is where those ideas become something you can actually work with.

Hum or sing into the mic and the app transcribes the melody to MIDI. From there you can edit, export to your DAW, and build on the idea without having to figure it out from memory. The on-device lyric assist feature — powered by a language model that runs entirely on your iPhone — helps you develop a lyric fragment into a full verse or chorus without opening another app or sending anything to a server.

• Hum-to-MIDI transcription: sing a melody, get editable MIDI • MIDI sketch editor — adjust notes before you export • On-device lyric assist, powered by an AI model that never leaves your phone • MIDI export to any DAW • Subscribe monthly, or unlock the full SUS4 suite forever: unlimited sketches, lyric assist, chord suggestions, and MIDI export

All AI runs on your device. Your melodies and lyrics stay private.