About · a measuring instrument, not a toy

Audio Tests Online is a browser-native audio and sound testing toolkit. Speakers, headphones, hearing range, stereo perception, and signal generation — every test signal is synthesized on your device with the Web Audio API. No audio is uploaded, no account is required, and no sound plays until you press play.

How we measure, honestly

Browser playback is uncalibrated, so every level on this site is reported indBFS, relative to full scale — never in dB SPL. Sample rates, Bluetooth resampling, and your DAC all shape what you hear, and the site says so wherever it matters.

Not a medical device

Hearing tools on this site are educational screening aids only and never a diagnosis. If you are concerned about your hearing, see a qualified audiologist.

Who writes this

Tools and guides are published by theAudio Tests Online editorial team.