App allows you to replace your tape measure with an Apple iPhone
The beauty of the Roomscan app is that you can take measurements of "L" shaped or complex rooms and the app works just as quickly as when you're measuring a simple room. There is a free version of the app, but an in-app purchase to Roomscan Pro adds the ability to measure a second room, and allows you to make color-coded floor plans. And with the Pro version, you can automatically connect rooms to create a plan of an entire floor.
For a quick look at how Roomscan works, take a look at the slideshow below.
source: Roomscan via RedmondPie