A notation built around the instrument, not around medieval choir books. One staff. No clefs. The key written as a word.
Drop a MIDI file anywhere on this page — or hit Try demo.
Google AI Studio key — free
True Clef sends your screenshot to Gemini Vision for transcription. Google's free tier covers 1500 pages a day, no credit card needed. The key stays in your browser only (localStorage) — never on our servers.
Use any chat with vision — your Claude.ai subscription, ChatGPT, Gemini, whatever. Drop your sheet-music screenshot in, paste the prompt below, and bring the JSON answer back here. No API key, no quota, no payments.
1
Copy the OMR prompt
2
Open Claude.ai (or any vision chat)
Open Claude.ai →Drop your screenshot, paste the prompt, copy the JSON reply.
3
Paste the JSON below
Reading the page…
Gemini Vision is transcribing the score.
Note—
Degree—
Interval—
Chord—
Bar—
Hover the staff · click a bar to loop
Drop a .mid file here
Or pick one above. Feather Fall, Outer Wilds, anything from a fan-made MIDI archive.
How to read it
Bass
The lowest concurrent voice. Foundation. Warm tone.
Harmony
Middle voices. Held chords, accompaniment. Cool tone.
Melody
Top voice, the line you hum. Accent tone.
Black-key lanes
Mirrors the piano keyboard. Every semitone is a real row — no hidden accidentals.
Pitch runs top-to-bottom as one continuous chromatic staff. Octaves are marked at every C line and again on each note as a small badge. No treble clef, no bass clef, no key-signature riddle — the key is written above as a word.