Once you set the scale of your drawing sheet, the drawings will be completely scaled to the real world, even down to the line thickness.
In addition, Archipad has many other features that cater to architects and designers, including layer rotations, shape and freehand drawing tools and more. [Design Milk]
You can download the app for free to use for small projects and, if needed, buy subscriptions to use the app for the time-frame required for larger projects.
Check out some shots of Archipad below:
* Via Design Milk.