S_TOOLS-STx is an acoustic speech and signal processing application for Windows.The software is actively being developed at the Acoustics Research Institute in Vienna, and is used in a variety of acoustic fields around the world. For non-commercial, scientific and educational purposes, we offer S_TOOLS-STx free for download.

A list of changes per version of STx is available in the documentation wiki.


The documentation for STx 3.8 is available in the following formats: 



You can download STx 3.8 here.

The documentation for STx 3.7 is available in the following formats: 

You can download STx 3.7 here