Effective 26 July 2026
The short version: your microphone audio is processed entirely inside your browser and is never recorded, uploaded, or seen by us. Everything below explains exactly what that means and what little data the site does handle.
Pitch Detector uses the browser's built-in getUserMedia() and Web Audio APIs to read sound
from your microphone. That audio is processed in short frames — a few hundredths of a second each —
purely in your browser's memory:
At no point is audio written to disk, added to a request body, or sent anywhere. You can verify this yourself: open your browser's developer tools, go to the Network tab, and use the tuner — you will see no outgoing requests carrying audio, because none exist. Closing the tab or pressing Stop releases the microphone immediately; the red "recording" indicator your browser or OS shows will turn off.
We do not use MediaRecorder, do not write audio to IndexedDB or
localStorage, and do not have a server component that could receive audio even if we wanted
it to — this site can be served as static files with no backend at all.
Because the core tool needs no account, we collect very little:
| Data | Collected? | Notes |
|---|---|---|
| Microphone audio | No | Processed locally, never transmitted (see above) |
| Name, email, account details | No | There is no account system |
| Contact-form messages | Only if you send one | Opens your own email client — the message goes directly from you to us, not through this site |
| Server access logs | Possibly, by your host | Standard web-server logs (IP address, user agent, timestamp, requested file) may be kept briefly by whichever hosting provider serves these pages, for security and abuse prevention |
| Cookies | No | The site sets none |
| Reference-pitch preference, hold toggle | In-memory only | Reset when you close or reload the tab; not saved anywhere |
Pitch Detector does not set cookies and does not write to localStorage or
sessionStorage. Settings such as your chosen A4 reference pitch live only in the page's
memory for the current visit and reset the next time you load the site.
This site loads no third-party scripts, trackers, advertising pixels, or font/CDN requests — every asset (HTML, CSS, JavaScript, images) is served from this same origin. No data about your visit is shared with an analytics company, ad network, or social platform through this page.
If that ever changes — for example, if privacy-respecting analytics are added to understand aggregate traffic — this section will be updated to name the tool, what it collects, and how to opt out, before the change goes live.
The contact page does not submit data to a server. When you press Send, your browser opens a new message in your own default email application, pre-filled with what you typed. You choose whether to actually send it, and it travels directly from your mail provider to ours — this website is never in that path and keeps no copy.
Pitch Detector is a general-audience educational tool suitable for music students of any age, including classroom use. Because no account or personal information is required to use the tuner, the site does not knowingly collect personal information from children. If a parent or guardian believes a child has submitted personal information through the contact form, contact us using the details below and we will delete it.
The site is intended to be served over HTTPS, which encrypts the connection between your browser and the server delivering these files. Because microphone audio never leaves your device, there is no audio data in transit to protect in the first place. Standard hardening (security headers, a strict content-security policy, no inline third-party scripts) is applied at the server level.
If this policy changes, the "Effective" date at the top of this page will be updated and, for any material change — such as introducing analytics, ads, or an account system — a notice will be posted on the home page as well. We encourage checking back periodically.
Questions about this policy or a privacy request can be sent to privacy@pitch-detector.org, or through the contact page.
