CONGRATULATIONS! YOU HAVE FOUND MOST ADVANCE SCREENSHOT RULER APP.
As an iOS developer, I always feel the lack of simple app to check position of objects/elements in any picture or screenshot. Now its very easy to find position and size of any UI element, specifically x/y position and width/height/size.
This app is specially designed for making Mobile Quality Assurance Engineer (QA Engg.) life much easier. Now they can quickly review Mobile UI with point & pixel perfect dimensions within minutes.
HOW IT WORKS:
Step1: Take Screenshot of the app to debug it. This will automatically be saved to your Camera Roll -> Screenshots album.
Step2: Open Screen Ruler app and you can see your recent screenshot, enable ruler and straight line frame.
Step3: Check your screenshot dimensions and UI element positions by zooming in/out and using rulers and line frame.