Reviewed this app as a possible business solution for a large furniture retailer. I tested this app in empty rooms with bright light and furnished rooms with bright light. I found it to work reasonably (though still inaccurate) in small square spaces, it stopped working when trying to render larger spaces (400 ft sq). As previous reviewers noted, it does not accurately measure. (I laid down a measuring tape and compared the rendering and actual). It also offers no ability to edit the rendering (other than squaring off) after measuring. I also found that initial points of the rendering would skip or jump throughout causing me to go back and re-do the entire room. Inaccuracy of measurements, inability to edit, and cost of app all combine to receive a solid 1 star rating.