About ToneToolkit

ToneToolkit is a set of 26 browser tools for making, measuring and changing sound. It is built and maintained by one developer. There is no company behind it, no team page and no lab: it is a personal project that grew out of wanting a tone generator that did not ask for an account first.

Why it exists

Most free audio tools online are thin. One frequency box, one play button, an advertisement, and no answer to the question you actually had. The aim here is the opposite: fewer tools, each with the depth you want the second or third time you open it, in English and German, with a link you can share that carries your settings with it.

How the tools work

Everything runs in your browser on the Web Audio API. Tones come from oscillators scheduled on the audio clock, microphone tools read a live analyser node, and file effects decode and re-render the audio in memory before handing you a WAV. No audio is uploaded, no account exists, and the only thing stored is your own settings in this browser's local storage.

What the numbers are and are not

Browser audio is uncalibrated. The hearing test can tell you which tones you responded to at a given volume; it cannot tell you your hearing loss in dB HL. The decibel meter shows a relative level that only becomes meaningful once you set an offset against a real meter. The tuner and the spectrum analyzer are as accurate as your microphone and your room allow. Every result here is a comparison, not a certificate, and none of it replaces an audiologist or a calibrated instrument.

Corrections

If a tool is wrong, or a German string reads like it was translated by a machine, that is worth an email. There is no analytics on this site, so an unreported problem is a problem nobody sees.