The measurement engine for building plans—built so an AI agent can drive it, and so an estimator wants to.
A takeoff is the act of measuring quantities off a construction drawing. OpenTakeoff does it two ways over one engine: 40 MCP tools for an agent, and a browser canvas for a person. Same flood fill, same scale gate, same math, same record. Every measurement stores its scale, its method, and who made it—which is what makes the output auditable, and what makes it training data.
For agents · Try the canvas · The engine's contract · For the person at the canvas · The data layer · Research · Build on it · Contribute
The two manuals:
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Watch it: an autonomous agent runs a takeoff, live, no cuts (2:47) · hospital finish plan → report in about a minute (1:14) · canvas walkthrough (1:10) · One-Click Area (0:51)