Calibrate your whistle
Many whistles play certain notes a touch sharp or flat — measuring your specific instrument means the app grades your playing against your whistle's actual tuning, not a generic average. You'll just play the D scale as a quick game.
⚠ No calibration saved for this browser
The app will grade against equal-tempered tuning, which can mis-label notes if your whistle drifts. Run the quick scale game below to fix. (Calibration is per-browser-and-origin; if you calibrated on a different URL or browser, that data isn't visible here.)
Play the D-major scale up and down as the notes scroll by — like a quick rhythm game. We measure the pitch of each note as you actually play it, so the app grades you against your real tuning and breath. Takes about a minute.