Developer: Loupe, Inc.

PlanGrid is a free construction app that lets contractors and architects collaborate with all their project plans, specs and photos on the iPad. Upload your PDF drawings to plangrid.com and they...

Photo Pen is a free and simple way to mark up photos and share them on your iPhone. Designed specifically for progress photos of your projects whether at home or in the field.

Simply...

A simple application to quiz you on mental calculations. You can configure it to your choosing: studying for the GREs (hard) or studying for a middle school test (easier).

Has the...