Sahasrara, or white lotus, is located at the top of the head or slightly above it. It is described as having 1000 colored petals arranged on 20 different layers; Its Hindu name can be translated as "thousand-petaled" into English. Sahasrara is also the Seventh Chakra, and is often considered the most subtle of all.
This download is totally safe. Rehegoo is the official developer of the app that can be found in the Health & Fitness category. The overall rating for Crown Chakra Cleansing 216Hz is 4.2 on Google Play.