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
20 Hz – 20 kHz IEC-style bands
Designed for real acoustic workflows
  • Upload WAV files from sound level meters or recorders.
  • 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 history of processed files per project.
Use cases
Environmental noise surveys Building acoustics Plant noise assessment Octave band analysis Tonality Review

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

Results are generally calculated according to IEC standards. Any actions, advice, or expenses based on the analysis are the user's responsibility, not the Third Octave's or any subsidiaries.