EchoRuler turns your iPhone into a sonic tape measure!
Now there is no need to carry an additional measurement device with you. Simply use EchoRuler to measure the distance between any two large, flat surfaces. EchoRuler was designed for the purpose of measuring room dimensions.
As the operation of EchoRuler depends greatly on the physical properties of the iPhone model, EchoRuler presently works only with the following models:
5, 5C, 5S, SE
6, 6S, 6 Plus, 6S Plus
7, 7 Plus
8, 8 Plus
X, XS, XSMax**
Models older than iPhone 5 will not be supported. Due to hardware configuration limitations, iPad models and iPod models are also not supported.