About

High-resolution real-time spectrum analyser available as a web music player and a JavaScript library.

audioMotion is a spectrum analyser and music player that runs in the browser. It is known for accurate, configurable frequency displays: discrete FFT bins, octave bands from 1/24th to full octaves, line graphs, LED-style bars, mirrored and radial layouts, and dual-channel views.

The analyser is also published separately as audioMotion-analyzer, a dependency-free JavaScript module of roughly 30 kB that developers can drop into their own sites. It supports logarithmic, linear, Bark and Mel frequency scales and A, B, C, D and ITU-R 468 weighting filters. Both the app and the library are licensed under the AGPL 3.0.

Features & Use Cases

FFT and 1/24th to full octave band modes
LED, luminance, mirrored and radial displays
Log, linear, Bark and Mel frequency scales
A, B, C, D and ITU-R 468 weighting
Stand-alone JavaScript library (audioMotion-analyzer)
AGPL 3.0 licensed

Pricing

Free and open source.

View current pricing

Sources

Pricing checked 3 October 2026. Preview from audiomotion.app, retrieved 3 October 2026.