Both. I remember the Plangrid team carrying around an actual paper binder for construction blueprints during YC. The thing weighed more than many people could l

Both. I remember the Plangrid team carrying around an actual paper binder for construction blueprints during YC. The thing weighed more than many people could lift! From what I remember, those were blueprints for only a subset of that project. Plangrid uses iPads and they have a large number of prominent customers listed on their website who clearly find it very useful.