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Finally learn the left hand.

Paste any YouTube piano tutorial. KeySync transcribes every note, turns it into Synthesia-style falling notes, and listens through your mic — it waits until you play the right key. Wrong note? It stops. Right note? It glows.

Try it live GitHub

15stranscription chunks

0.25x–1xtempo control

0sign-up for a look

Why I built it

I could learn the right hand from tutorials fine. The left hand? Never. So I built the tool I needed.

// any-tutorial

YouTube link in, notes out

Paste a tutorial URL or upload audio. The pipeline separates the piano, transcribes it, and maps every note.

All notes shown — no hand-splitting gimmicks
Start a build, close your phone, come back when it's done
Your builds save to your cloud library

// wait-mode

Mic that actually listens

Play along on your real piano. KeySync hears each note and waits for the right one — chords included, in any order.

Correct key glows, wrong key flashes red
Calibration wizard tunes it to your room
Live level meter so you know it hears you

// practice-tools

Practice like you mean it

Slow it down, loop the hard bar, count yourself in. Then check the report.

Tempo slider from 0.25x to 1x
A/B loop + count-in metronome
Post-run accuracy report, per-song mastery, streaks

How it works

From link to practice session in three steps.

Paste

Drop a YouTube tutorial link or upload an audio file.

⏳ Build

Transcription runs in the background. Close the tab — it'll be ready.

Play

Open your build, allow the mic, and play. It waits for you.