iruler.net
This website measures the size of your screen and creates the image of a ruler that is the actual size.
VisualRuler
VisualRuler is an iOS mobile app which uses advanced computed vision algorthims to turn your iPhone camera into a ruler. Becau ...
i-Ruler
The most comfortable and easy to use ruler for your iPhone, See screenshots or just download and try it for FREE!
HOW IT WORKS ...
Xalpha Lab Ruler
A simple, user-friendly and accurate ruler for your phone! Use a coin or a credit card to calibrate the ruler anywhere, when y ...