Sound tools

Frequency analyzer

View a live logarithmic spectrum and find the strongest frequency in microphone audio.

Free to use
Runs on this device
No account

Idle

Microphone audio is analyzed on this device and is never uploaded.

Dominant frequency-- Hz

Frequency20 Hz–20 kHz

Current level-- dB

Peak-- dB

Calibration offset

+85 dB

Accuracy limits: Browser microphones are not calibrated sound-level meters. Use the readings for comparison and training only. Do not use them for legal, medical, or compliance decisions.

Procedure

Allow microphone access. Keep the sound source steady.
Read the 20 Hz–20 kHz spectrum. Note the dominant frequency.
Keep the same position when you compare rooms, speakers, or sources.

Function

Spectrum limits

Device response, automatic input processing, room reflections, and background noise can change the graph. Use the graph for diagnosis and comparison. Do not use it for laboratory certification.

Browser support

Use a current version of Safari, Chrome, Edge, or Firefox. Microphone tools require HTTPS and microphone permission.

Technical sources

MDN getUserMedia()NIOSH Sound Level Meter App