We started where the spreadsheets stopped.
Core 137 exists because the tools contractors rely on were never designed to talk to each other. This is how we got here, and what we are building next.
Nine tools, one job.
A sub bidding a hospital fit-out was running takeoff in one app, pricing in a spreadsheet, drawings in a cloud drive, the schedule on a whiteboard and invoices in accounting. Every handoff was a retype, and every retype was a margin leak nobody could see until closeout.
Enter the work once.
We started Core 137 on a single conviction: the estimate, the proposal, the schedule, the field log and the invoice are the same job seen from five angles. Model it once and the whole business becomes legible — cost to complete included.
AI that shows its receipts.
Assistants only earn their place when they cite the drawing, the cost item or the change order they read. Ours are grounded in your workspace and your cost book — never trained on it, never guessing at a number a person will sign.
From a takeoff to the whole job.
Core 137 begins.
A small team and one goal: end the tool soup contractors live in.
Estimating & the cost database.
Digital takeoffs, assemblies and a live materials + labor database across 38 US regions.
AI proposals & change orders.
Branded, e-sign-ready proposals from any estimate — plus AI change-order detection.
Subcontractors & Estimators goes live.
Estimate, propose, schedule, build and bill — one platform, self-serve.
Opening the rest of the platform.
General contractors, freelancers, vendors and more — rolling out from the waitlist.
Small team, wide surface.
building in public
priced weekly
estimate → invoice
San Francisco · Berlin
What we will not trade away.
Built for the field
If it does not work with muddy boots and one bar of signal, it does not ship.
Your numbers, protected
AI runs on your data and your cost book — never to train shared models.
One source of truth
Enter the work once. Estimate, proposal, schedule and invoice all read from it.