Nowadays, there are many Android apps requiring permission on microphone and camera to run them. But we don't know whether they do "extra thing" after done their business.

"Extra thing" may be that they listen to user's stories. Have you faced a case that many Ads regarding to your topic which you talked to your friends via a social app?

Checking whether an app has permission on microphone or camera is built-in feature of Android OS. But it is not convenient.

This app helps you check the permission quickly. Let's use it to check your phone frequently, otherwise your data may be collected by some apps.