Free online audio testing tools, built for one job.

StereoTest is a focused collection of free online audio testing tools for headphones, speakers, and everyday stereo systems. Use it to check left and right routing, stereo balance, speaker polarity, or a specific frequency without installing an app.

Every tone is generated locally with the Web Audio API. The tools do not require an account, microphone permission, uploaded audio, or a database. This keeps testing quick and makes the signal path easy to understand.

What this site is for

The tests are designed for setup checks, troubleshooting, and learning how stereo playback behaves. They are not clinical hearing exams, laboratory calibration systems, or substitutes for qualified technical and medical advice.

The site stays deliberately narrow. It covers stereo, audio, headphones, and speakers rather than expanding into unrelated device tests. That focus lets each page provide a real tool and a method that fits the specific audio question.