Privacy Policy
The short version: your audio never leaves your device.
Last reviewed: . This date changes only when the policy substantively changes.
Audio stays local. All tones are synthesized in your browser by the Web Audio API. Microphone tools use getUserMedia; the stream is analyzed on-device, and any local recording exists only in page memory until you play it back, discard it, or close the tab. There is no code path that uploads audio, and we do not want one.
No accounts, no audio cookies. The site has no login and sets no tracking cookies of its own.
Local preferences. We store a few settings in your browser localStorage under the st. prefix — for example st.theme (light/dark), st.locale (interface language), st.volume, st.tone.freq, st.noise.type and st.fftSize. These never leave your browser and you can clear them any time via your browser settings.
Hosting and logs. The site is served as static files from a CDN (Cloudflare). Like any web host, the CDN may keep standard request logs (such as IP address, user agent, and requested URL) for security, abuse prevention, and availability. We use them only through the host for those purposes.
No ads or analytics today. At the time of the last review below, this site runs no third-party analytics, ads, or tracking scripts. If that ever changes, this page will be updated to name the third parties before any script goes live.
Contact. Questions about this policy? Write to the address on the contact page.
FAQ
Does SoundTester record my microphone?
Only you can start a recording, and only in the mic test tool. The recording is held in your browser memory so you can play it back; it is never transmitted, and it is gone when you discard it or close the page.
Do you use cookies?
The site itself sets no cookies. Interface preferences are kept in localStorage, which stays in your browser and is not sent with requests.
What if you add analytics later?
This policy will be updated first, listing the third party and what it collects. Audio processing will stay local regardless.
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