a few "caveats" are in order:1) the known reference *must* be in the same plane as the measured item2) the iPhone camera is wide-angle (about 28mm), which will distort the plane of reference if the measuring and the measured are not sufficiently distant. 3) the lens-to-object distance must be consistent to realize accurate results4) frankly, this is a *comparing* tool more than a *measuring* tool, which is fine if you have both objects together in the image. the provided references make little sense since the likelyhood they will be in the same plane is nil.5) where this app will shine is if the user, say parks a vehicle of known length next to a building or tree, the tree's or building's height may be determined

Due to the angle of the camera to the object it is almost impossible to measure items with any accuracy. My recommendation would be to add a bubble level to the camera mode as a quick fix but rather have a recorded plane whereby the phone is placed on the same plane as the object, a level taken and recorded and then another bubble during camera mode to ensure phone is held to recorded plane. This would make the app far more accurate.

I bought this to some work. Needed to measure map scale and then use that number to find distances on a map but the loaded photo was at a lower resolution than the actual photo so i can’t clearly see the scale - its too blury. It makes this a waste of money for me. It would be great if it could be loaded at same resolution.

This app is very difficult to use. It is hard to place the measure points in the correct place with your finger blocking the view. A magnifying glass above the point would be helpful. The interfaces and functions are limited and not user friendly