<p>Yes. Every export you publish from Revit or the federated Navisworks model is versioned, and BidLight diffs it element by element. If a wall moved between v2 and v3, you see it. Who changed it, when, and what it touched.</p> <p>That matters at bid time. You are not comparing PDFs side by side the way it was done in 2005. You are looking at one live record of the project, and the cost rides on the same model. When the design changes, the number updates. Labor, equipment, material, and time come back in minutes, not another takeoff cycle.</p> <p>Here is the practical loop:</p> <ol><li>Publish the model from Revit or Navisworks.</li><li>BidLight versions that export and diffs it element by element against the last one.</li><li>Moved, added, and deleted elements surface with metadata attached.</li><li>The two AI models read that geometry and metadata and classify the BOQ line items at 86% accuracy.</li><li>Pricing pulls from the roughly $30,000 database plus Craftsman, 1Build, and RSMeans.</li><li>Your estimate reflects the revision before it reaches the bid.</li></ol> <p>You catch the wall that moved while it is still cheap to catch. Not three weeks later at the coordination meeting, when it is already in the number you sent.</p>