Marks that
move the job.
Markup and takeoff for the people who actually use drawings. Open a plan, mark it up, measure it, send it. Works on any device, with anyone you invite.
The pro tool for drawings. Everything else orbits it.
Opens any set, fast. Takes off at bid speed. Open APIs and AI-assisted review so it plugs into the tools your team already uses.
Everyone on the same sheet.
Multi-cursor markup on the current set. Redline a detail with the architect while the PM pins an RFI on the next page. No more emailed PDFs with three different revision letters on them.
- Multi-user cursors with identity and role color.
- Markup provenance: signed, timestamped, exportable.
- Stamps, pins, callouts, text, shapes — shortcuts for all of them.
See what changed between revisions.
Drop two revs side-by-side and Redliner overlays the diff. Added geometry in green. Changed in amber. Deleted in red. Drag the handle.
- AI-assisted version comparison on vector PDF and DWG.
- Scope the compare to sheet, region, or discipline.
- Export the diff as a marked-up sheet or structured data.
The latest rev, everywhere, automatically.
Upload a new revision. Redliner links the old markups to the right coordinates on the new sheet. No more “is this the current plan?” Slack threads at 11pm.
- Title-block OCR auto-extracts sheet number, name, date.
- Markup re-anchor with manual override.
- QR decals open the current set at any location, in the field.
Takeoff at bid speed.
Linear, area, count. AI-assisted scale detection and legends you save once and reuse across every bid. Export to Sage, QuickBooks, STACK, PlanSwift — or CSV, if your shop keeps it simple.
Open the plan. Mark it up. Keep working.
Browser-fast on a laptop. Touch-native on a tablet. Offline-safe on a phone in a basement with one bar of signal.
Redline with a stylus.
Pressure-sensitive markup. Palm rejection. Snap to wall, corner, midpoint.
Photo-to-drawing pin.
Snap a photo in the field. Drop it on the exact coordinate. Done.
Delta sync when you're back.
Work in a basement. When signal returns, only the changes upload.
One product. The people who live in drawings.
Drawings are the shared language on every job. The hook changes by what you do for a living.
The redline, evolved.
Clean redline cycles with clients. Electronic stamping. Version compare that actually reads your drawings.
The current set, always.
Every markup lands on the right rev. Photos pin to coordinates. An audit log that holds up in a dispute.
Open the plan. Mark it up.
Just the sheets you need. Offline. Fast on the phone in your truck. Viewers are free — always.
Takeoff that keeps up with your bid.
Linear, area, count. Legends you save once, reuse across every bid. One-click export to the estimator you already use.
Your drawings where they already live.
Connect Redliner to the file storage your team already uses. Keep the drawing set in place; mark up, measure, and review without copying files into another silo. WebDAV is live today — the rest of the launch lineup is on the way.
Want to be a launch partner for one of these, or tell us where your drawings live? Get in touch.
Two tiers. Built around the work.
Start with a 7-day free trial, then pay for the people who mark up, take off, and review.
- 1 Editor
- Unlimited Viewers
- Takeoff + legends
- Version compare
- Unlimited projects + sheets
- Integrations: WebDAV (live); Dropbox, OneDrive, Google Drive coming soon
- Everything in Pro +
- Access to Support Team
- Audit Log
- Embed Apps
- Whitelabel
Add-on: Claude Connector — $20 / workspace / month. Learn more.
Straight answers for AI search and humans.
What is Redliner?
Redliner is browser-first construction PDF software for drawings, markups, takeoffs, AI-assisted scale detection, drawing revision comparison, and drawing-centered workflows like RFIs, tasks, photos, documents, and project poster links.
Is Redliner a full project management system?
No. Redliner is intentionally drawings-first. Use it for sheet sets, markups, measurements, revision review, and drawing context. Use BuildTools, Procore, or another system of record for full project operations if needed.
What file types does Redliner support?
Redliner is built around construction PDFs and large drawing sheet sets. The viewer is tuned for high zoom, page references, annotations, and exportable markup workflows.
Can Redliner handle drawing revisions?
Yes. Redliner keeps old sets available while making the current set clear, so teams can compare revisions, preserve audit context, and avoid accidentally marking up superseded sheets.
Does Redliner support takeoffs?
Yes. Redliner supports area, linear, and count takeoffs with page references, categories, legends, scale calibration, and exports so quantities can be traced back to the sheet that produced them.
How does scale work?
Set or verify scale before relying on measurements. Redliner can assist with scale detection, but users should review the suggestion and manually calibrate from a known dimension when precision matters.