In the following text I'll share my opinion about this app, Aruler, and write down the things I like or dislike about it.

Aruler looks like something new since it allows you to measure things using your phone's camera.

Pros:

• it was developed for both Android and iOS
• it allows you 3D measurements
• you can measure angles
• you can measure distance from the camera to a 3D object
• on-screen ruler

Cons:

• not sure how precise this is but the idea of such kind of app is amazing.

Great hunt @ray147880!