FreeBeam

Measure and mark up construction drawings, on site, on your phone.

FreeBeam opens a PDF drawing, puts it on a scale, and lets you take real measurements off it with your finger. A magnifier finds endpoints, intersections and perpendiculars so a point lands where you meant it, not where your fingertip covered.

Everything happens on your device. Nothing is uploaded, and the app needs no signal to do its job - which matters, because site huts rarely have any.