How well it reads a floor plan.
We keep a library of real floor plans with hand-counted answer keys, read them with the live reader, and score every release against them. These are the numbers, as they are.
| What is counted | Score | |
|---|---|---|
| Rooms foundevery real room the plan names, closets and halls aside | 93% | under 95% |
| Doorsevery door that closes, closet doors included | 96% | at the gate |
| Windowsevery window opening in an outside wall | 100% | at the gate |
| Storeysbasements, main floors, upper floors | 98% | at the gate |
| Stair flightseach flight the plan draws, going the way its arrow points | 97% | at the gate |
| Stairs that reach their floora stair on one storey arrives at the right spot on the next | 100% | at the gate |
| Porchescovered and uncovered, as the plan labels them | 100% | at the gate |
| Decks, patios and terracesthe paved and decked parts of the plan | 89% | under 95% |
| Stands up as a buildingfloors inside walls, nothing floating, nothing colliding | 100% | at the gate |
A score is how close the model's count is to the answer key's, averaged over the plans. 100% on rooms means every room the plan names is there, with the right name, in the right place.
What the plans are
Nineteen core plans and a longer bench behind them: 1920s to 1970s plan-book houses from the USDA and the Sears catalog, Historic American Buildings Survey measured drawings, and modern architect sets. All public domain, which is why they can be shown. Each one was counted by hand - rooms, doors, windows, storeys, stair flights, porches, decks - and the key is checked when a score moves.
The plans are read through the same pipeline a customer's plan goes through, nothing tuned for the test. A change to the reader is replayed against the library before it ships; if a core score drops, it does not ship.
What this means for your plan
Old scans and plan-book pages are the hard cases, which is why they are in the library. Your architect's PDF with printed dimensions will usually read better than these numbers. Either way, the free preview shows you your own plan in 3D before you pay, with anything the reader could not make out listed next to it, and a full refund within 48 hours if the result is not right.
Where the model misses, you can say so in plain English and it is fixed, or drag the wall yourself. Those corrections, when an owner opts in, go into the next round of reader improvements.