Interesting hunting, my friend! The app can be very useful. Here's my opinion:

Pros:

• The most useful thing: it lets you know if someone is poking around on your phone or trying to break your security.
• Leave a photographic record of the person who tried to access your device.
• It's lightweight.

Cons:

• More than 15 dollars for what this app offers is very expensive.
• It has some bugs that need to be fixed. On low-end devices the app can be hung up.