The pitch detector, mic test, and every other tool here process audio with the Web Audio API inside your browser. Microphone input and uploaded files are analyzed on your device and discarded from memory when you leave. Nothing is recorded, nothing is stored, and no audio data is ever transmitted to us or anyone else. There is no server that could receive it — this site is static files.
Offline support comes from a service worker cache of the site's own files — content, not anything about you. Some tools keep your settings (like the A4 calibration) in the page URL so links are shareable; that stays in your address bar unless you share it. We set no cookies.
Aggregate, anonymous page-view tallies (how many visits a page got), with no cookies, no fingerprinting, and no personal identifiers. We can see that pages were visited, not who visited them. That's the whole list.
Two external services exist: Google Fonts (your browser fetches font files, so Google sees that request's IP) and Cloudflare Pages hosting, which serves these static files with ordinary access logs. Neither receives any audio or tool data — there is none to receive.
Microphone access is requested only when you press a start button, is used only while the tool runs, and is released when you stop. You can revoke it any time from the padlock menu in your browser. The tools detect a revoked permission and stop cleanly.
Something unclear, or something we should do better? Contact us — privacy questions get answered first.