Drawing markup software
Construction Drawing Markup Software
ContractorCounter is a markup workspace for reviewing construction drawings: annotate the PDF, check measurements to scale, count items, review with your team in real time, and export a clean marked-up set.
Updated · 3 min read
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See it on a real drawing
This is the real workspace on a sample drawing. Create a free account, with no card, to use it on your own drawings.
Explore the workspace
Every count stays on the drawing.
This is the real workspace. Create a free account to use it on your own drawings.
Sample drawing · scripted walkthrough and AI responses.
Mark up the drawing where the work happens
Add callouts, clouds, arrows, text, stamps and highlights directly on construction PDFs, so every note stays on the part of the plan it is about. Leader-line callouts keep the note clear of the linework it points at. New to the conventions? Construction drawing markups explained covers what each markup type means and when to use it, and how to read construction drawings covers sheet numbers, scales and legends.
Measure and count without leaving the review
Calibrate the scale once per sheet, then check lengths and areas and place count marks while the review notes stay visible. A query like "is that wall really 4.2 m?" gets answered on the drawing, not in a separate tool. Calibrating scale and measuring shows the steps, and marking up drawings on an iPad compares the options for site work.
Review together in real time
Share a workspace by email or link and mark up the same drawings at the same time. Presence avatars show who is in, and live named cursors show where they are pointing, so a review call happens on the sheet instead of over screenshots.
A review round you can undo
Every change is recorded in the workspace activity log with who made it, so "who moved that dimension?" has an answer. Markups save seconds after you stop drawing, so a dropped connection on site loses nothing, and snapshots keep the state before a round, so a bad pass is a restore, not a redo.
Export a clean record
Send marked-up drawings to clients, field teams and estimators as PDFs instead of scattered screenshots. If a drawing arrives from Revu with its markups baked into the page, unflattening Bluebeam markups explains what can and cannot be recovered.
When a general PDF review tool fits better
Drawboard and similar tools are broad PDF review apps built around design-team workflows. ContractorCounter adds what contractors need on top of markup: scale-aware measurement and symbol counts that carry into a live Bill of Quantities and a priced quote. If you only ever comment on PDFs, a general tool may be all you need; test both on the same drawing.
Questions about Drawing markup software
What is construction drawing markup software?
It is software for adding annotations, measurements, comments, stamps, and count marks directly to construction drawings, usually PDFs. The distinguishing features against a generic PDF editor are construction-specific: scale calibration so measurements read in real units, count groups for symbols, and exports that keep the markups tied to the sheet they annotate.
Who uses drawing review software?
Contractors, estimators, project managers and field teams use it to clarify scope, check measurements, count items and record decisions on the drawing, then share the marked-up set with the rest of the job.
Can my team mark up the same drawings at the same time?
Yes. Share a workspace by email invite or a copyable link and work on the same drawings together in real time — you can see who else is in the workspace, follow their live cursors on the sheet, and markups appear for everyone within seconds. Sharing is included on every paid plan; there is no separate collaboration product or session setup, and collaborators just need a browser.
Is ContractorCounter only for estimating?
No. Use it for drawing review and measurement on their own, or carry your counts and measurements into a Bill of Quantities, review rates, and prepare a quote in the same browser workspace.
Does it work in the browser?
Yes: ContractorCounter is fully browser-based, which means it runs on Windows, macOS, and iPad without an installer, a Windows-only desktop dependency, or a virtual-machine workaround for Mac users. Upload PDF or image drawings, calibrate the scale once per sheet, and the full markup, measurement, and counting workflow runs in the tab, at the desk or on site. Because the workspace lives in the browser, the same drawing opens identically on every machine, so the office and the field are always looking at the same markups without anyone syncing files or matching software versions. If your team has been locked out of desktop-first tools on Mac or iPad, this is the structural difference to test first.
See whether it fits your next job.
Start with your own drawing in the free preview. No card required.