For General Contractors on Jobs

Prevent weeks of rework.
Never miss a drawing change again.

Automated drawing comparisons that surface real scope changes —
reducing RFIs, delays, and change order surprises.

Try us for free

How it works

From revisions to decisions in minutes

Upload. Review. Price. Same day.

Step 01

Upload two drawing sets

Drop in your prior and current drawings in any format.

Prior set

PDF · 36 sheets

Current set

PDF · 38 sheets

Sync

Sheet matchingAuto

Title similarity92%

Scale detection88%

Gridless alignmentReady

Next: overlay~45s

Step 02

Generate overlays and change analysis

Automatic sheet matching and alignment, precise overlays every time even without grid lines.

Block AAligned

Block BAligned

ChangesAuto-grouped

AdditionsAuto

SubtractionsAuto

CoordinationAuto

Step 03

Review changes and project impact

See deltas, costs, and responsible trades together in one report.

Mechanical coordination

High impact

$120K – $180K

Envelope revisions

Scoped

$40K – $65K

Lighting changes

Minor

$8K – $12K

RFIs drafted

Assigned trades

3 teams

Decision-ready

Today

Step 04

Export and distribute

Share with owners and subs so decisions don't wait and projects keep moving.

Change packet

Overlays12

Change summaries9

Notes + RFIs6

Send

Owner

Email + link

Subs

Trades packaged

From revisions to ROMs in hours, not weeks.

Try us for free

No credit card to start

Founders

Who are we?

We built automation tools at Notable that processed millions of healthcare documents to streamline patient access to care. Now we're solving the revision review problem that costs GCs weeks of rework on every project.

Kevin Huang, PhD

Stan Liu

Change report

See what changed and what it costs

One report shows the full picture: changes by discipline, pricing impact, and who needs to act.

Project

Early Childhood Center Construction

Sheets & Overlays

S-102 · Structural Overlay

RTU support framing revised; CMU wall lintels added; roof elevations updated.

13-A-103 · Architectural Overlay

Walkway stair removal at prefabricated aluminum cover area.

S-102 · Roof Plan

S-102 · Structural Overlay

Order of Magnitude Estimate

Low

$18k

Mid

$24k

High

$32k

Overview

The revisions to the S-102 Roof Plan primarily focus on structural modifications to the mechanical unit support framing, updates to various roof elevations, and the addition of specific structural lintel requirements for CMU walls. Former W10x54 beams and dunnage framing callouts have been replaced with W8x18 lintels. High Roof elevations adjusted by approximately 1 inch.

Drivers

Mechanical RTU framing revised from W8X28 beams to W8x18 lintels near grid lines B-C / 3-5.
New structural lintel specifications added for CMU walls near grid line G/1.
Roof elevation adjustments for High Roof high point and low point.

Next steps

Confirm RTU loading with mechanical contractor for revised W8x18 lintel configuration.
Coordinate CMU lintel installation with masonry contractor (HSS12x10x1/2 and W8x18).
Update steel shop drawings with revised framing members.

Prevent weeks of rework.Never miss a drawing change again.

From revisions to decisions in minutes

Step 01Upload two drawing setsDrop in your prior and current drawings in any format.

Step 02Generate overlays and change analysisAutomatic sheet matching and alignment, precise overlays every time even without grid lines.

Step 03Review changes and project impactSee deltas, costs, and responsible trades together in one report.

Step 04Export and distributeShare with owners and subs so decisions don't wait and projects keep moving.