Third Octave
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For acoustic consultants & noise engineers

Browser-based audio analysis for real-world acoustics.

Upload WAV files and get calibrated 1/3-octave bands, single octave spectra, and FFT analysis in seconds. No more patchwork of scripts and spreadsheets.

Start free trial Try demo – A-weighted LAeq,1s No card required for the demo.
Live demo
LAeq,1s = 63.4 dB
A-weighting 1 s integration
Spectral tools
1/3-octaves · FFT
8 Hz – 20 kHz IEC-style bands
Designed for real acoustic workflows
  • Upload WAV files from sound level meters, recorders, or simulations.
  • Compute 1/3-octave and octave band spectra with A, C or Z weighting.
  • Run FFT and export numeric data for reports or further processing.
  • Keep an auditable history of processed files per project.
Use cases
Environmental noise surveys Building acoustics Plant noise assessment Product sound quality Classroom & office design

Third Octave gives you repeatable, shareable processing logic so that your entire team uses the same methodology and outputs.