Automated comparison of PDF drawing revisions, even when the geometry has moved.

Comparing drawing revisions by hand is a slow, tedious process. Despite the effort, critical changes are still often missed. We developed Comparedrawing to eliminate this risk.

Comparedrawing automatically detects every geometric and value change between PDF revisions, allowing engineers to focus on the impact of the change rather than the search. Because it works directly on issued drawings, no CAD source files or software installations are required.

Request access

Automated Comparison in Three Steps

Seamless Upload

Upload two PDF revisions (any size). No CAD data is required; our system works directly with issued PDF documents.

Intelligent Alignment

Our system utilizes a non-generative machine learning solution based on deep neural networks and computer vision to align the sheets automatically. By recognizing the geometry rather than just comparing pixels, it filters out shifts in view position or plotting size, ensuring that only actual modifications to the part are reported.

Annotation on the Drawing

Differences are marked directly on the sheet. You zoom in on any mark to read the change in its own context, at the scale you need.

How to get access.

Fill in the form, or write to get-started@comparedrawing.com. Sales replies with an invite and sets the account up with you.

Before you run a drawing.

Why is access invite only?

The compare is built and running. New functionality is in test alongside it, so accounts are opened by invite rather than sign-up, which keeps each new account small enough to set up properly and to follow up on by a person.

How do I get one?

Use the form on this page or write to get-started@comparedrawing.com. Sales issues the invite and sets the account up with you.

What file types can I compare?

PDF, at any sheet size from A4 to A0.

Do you need the CAD source?

No. Comparedrawing reads the PDFs your customer sends, so nothing changes upstream and you do not need access to the model.

What if the two sheets are not aligned?

One sheet is registered to the other before anything is compared, so differences in how the sheet was placed or plotted do not read as changes to the drawing itself.

How are changes marked?

Your drawing is shown as it came to you, nothing recoloured. Added, removed, moved and value-changed geometry is drawn over it in redline, on the sheet where it sits. You zoom in on any mark to read it in context.

Our customers' drawings are under NDA. Where does the file go?

Uploaded over TLS and processed in the EU. Nobody outside your account can open your drawings, and we do not use them for anything on our end. If your work cannot leave your network at all, say so in the form and sales will take the requirement from there.