Great idea!

I have been actually looking for something like this for a long time! Every time I measure something using this app its about 3 inches more than its supposed to be, which is pretty good for measuring on the go when I dont have a ruler handy. One time though I measured something that I knew was 5 feet 6 inches, and it came out to be 5 feet 6 inches on the app. So, I am pretty satisfied with this app.

gduarte93 about RulerPhone - Photo Measuring