Privacy

Whistling Tutor's privacy rule is simple: your whistle never leaves your device.

What happens to your whistle

• When you press Start listening, the microphone signal is measured in your browser, slice by slice, by a small pitch detector that ships with the app. It finds the pitch of each slice with autocorrelation and discards the slice. No model is downloaded, and no audio is sent anywhere.
• Only the detected pitch numbers (hertz over time) are kept, for the current exercise, so the line can be drawn and the note scored. Nothing is recorded, uploaded, shared or stored.
• The microphone is only on inside an exercise after you press Start listening. It turns off when you leave the exercise, press Turn mic off, or switch to another tab.

What is stored on your device

• Your whistle range, which exercises you have done and your best accuracy on each, your points, badges, levels and day streaks.
• Your settings (sound, celebrations, strictness, whistle range) and whether you have seen the welcome message.
• An offline copy of the app, so it works without network after your first visit.
• All of this lives in your browser on your device. There are no accounts, ads, cookies, analytics or trackers.

How to delete it

• On the home page, open Offline proof and press Delete all my data. It shows what was stored before and after.
• Or open Settings and press Clear progress.
• Or clear this site's data in your browser settings.

What the app cannot do

• The app loads nothing from other websites. A security policy (connect-src 'self') blocks connections anywhere else, so the app cannot send data anywhere even if it tried.
• The links on the About page open other websites in a new tab. Those sites have their own privacy policies, and Whistling Tutor sends them nothing.
• Like any website, the server that delivers the app's files may keep standard technical logs (such as IP addresses) of those downloads. The app itself sends nothing.

Prove it yourself

Press Offline proof on the home page. It shows a live log of every network request the page makes, lets you simulate a fully offline session, shows exactly what is stored, and deletes it all with one button.

Whistling Tutor version 1.0.0 · Disclaimer