
Register drawings, align original and revised sheets, and review every change for Quantity Surveyors, contractors and professional teams. People decide — the tool shows.
Colour-coded overlays and raster pixel difference of real PDF pages.
2-point similarity, 3-point affine or least-squares fit with RMS residual.
Classify, comment and export changes with append-only review history.
Drawings stay private and open only through short-lived links for members.