Same railing drawing. Two takeoffs.

One real shop drawing — a sloped square-tube picket guard, ~18'-6". Here's what free ChatGPT returns vs what RailTakeoff returns.

The drawing (both got this exact image)
18'-5⅝" · 3'-6" high · 1½" SCH40 rail · 1½" SCH80 post · ½" sq pickets @ 4" o.c.
Free ChatGPTgeneral AI
RailTakeoffbuilt for prints
Right side validated against the drawing's computable geometry + published fab-labor and price norms (PASS). You still set the final $ rate.