Privacy

Drum Rudiment Coach's privacy rule is simple: your audio never leaves your device.

What happens to your hits

• In mic mode, the microphone signal is measured in your browser, block by block, by a small hit detector that ships with the app. It only looks at how loud each 64-sample slice is, to find the moment each hit starts. No model is downloaded, and no audio is sent anywhere.
• Each block is discarded as soon as it is checked. Only the times of your hits are kept, for the current take, so they can be scored. Nothing is recorded, uploaded, shared or stored.
• The microphone is only on while you are on a practice screen in mic mode. It turns off when you go back to the rudiment list, press “Turn off”, switch to Tap mode, or switch to another tab.
• In Tap mode the microphone is never used at all.

What is stored on your device

• Which rudiments you have passed and your best score on each, your points, badges, best combo, recent average timing error and practice days.
• Your settings (chimes, confetti, click-through, input mode, latency calibration) 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 Drum Rudiment Coach 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.

Drum Rudiment Coach version 1.0.0 · Disclaimer