NetSpy is an information gathering tool that checks if someone you know the name or username, has an account on more than 20 different social media platforms.
NetSpy is a mobile application made by Android Studio with Java.
Here are the Java source codes of NetSpy apk.
For the original apk: https://play.google.com/store/apps/details?id=com.ozgurcanarican.netspy&hl=en