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Is their selling point revision control for blueprints, or is it viewing them on mobile devices? On the latter point blueprints are very large, so I can't see how viewing them on a mobile device is useful.

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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.

I think 'mobile device' in the case of construction sites may be a rather broader term.

Typical US blueprint sizes are 18" x 24" or 24" x 36". Are you suggesting they have a large monitor or a printer onsite?

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