★★★★★ by Superplexus
This is the most used app I have purchased for my iPhone, and I’ve only purchased really good apps that I need and use regularly. In fact, I have used it every day for about a year, receiving each update as soon as it is released. There are still features I have not yet relied on, but when I need them they will come in handy, such as the masonry and roof features. The stair calculator is absolutely amazing and a huge time saver. Now I am less likely to make an error, and the drawing email concept is great.