Question 1

What is drawing comparison?

Accepted Answer

Drawing comparison reviews two revisions of a construction drawing to identify differences in geometry, dimensions, notes or details. It helps a project team understand what needs checking when a revised drawing arrives.

Question 2

What can I upload?

Accepted Answer

Two single-page files - PDF, PNG or JPEG - that are revisions of the same drawing. Multi-page PDFs are refused: export the one sheet you want compared. A PDF with a text layer gives the best result because the drawing number and revision can be read from it before the comparison starts.

Question 3

How do you know the two files are the same drawing?

Accepted Answer

The drawing number is read from each sheet's text layer first. If both are readable and differ, the pair is refused and nothing is compared. If a number cannot be read, the comparison goes ahead and the title blocks are read during it; if the title blocks disagree, the changes aren't shown, and if a title block can't be read, the result says the drawing number is not confirmed so you know to check it yourself.

Question 4

Are my drawings stored?

Accepted Answer

The uploaded files are not. We make one image of each sheet, keep those images only for as long as your private result link works so the findings can be drawn on them and then delete the images and the result together.

Question 5

Does AI replace the drawing review?

Accepted Answer

No. The findings are a starting point for review. Check them against the issued drawings and use the appropriate designer or engineer to resolve anything unclear before work proceeds.

Question 6

What does PlanOps add?

Accepted Answer

Whole drawing sets rather than one sheet, a change register that keeps every finding with its drawing, RFIs raised from the changes and the rest of the project's documents, programme and quality records alongside. The free tool is one sheet at a time.

Guides to drawing revisions and comparison

Drawing revisions on a UK project: codes, status and what supersedes what

The revision review checklist

How to compare two drawing revisions properly