Vishuddha is the blue chakra, and is also known as the purification center. When it is open, you are able to turn negative experiences in wisdom and knowledge. When it is closed, a person slowly undergoes a process of death and decay. It is said that one's success or failure in life is mainly determined by the state of this chakra alone.
The tool is totally safe for downloading. Rehegoo is the developer of this application which can be found in the Music & Audio category. The app has been rated 4.3 on Google Play.