Spectrum Analyzer is a free FFT-based tool that allows users to analyze human voice frequencies. The program is open-source, and users can clone its source code from its GitHub repository.

The Spectrum Analyzer is designed to be used for human voice analysis. The program is based on Fast Fourier Transformation algorithms, which is a standard method for analyzing sound frequencies. Users can use this tool to measure the frequency of human voice and identify any anomalies.

It is worth noting that the developer has released a new and improved version of the app called Spectrum Analyzer1, which can be downloaded from the Google Play store. This is because the developer lost the key for the previous version and had to upload a new version as a brand new app. Going forward, users are advised to download the new version instead.