San Xuan Tang is an AI feng shui service that analyses a home floor plan and returns a room-by-room report with annotated diagrams. Upload a photo or screenshot of your floor plan, optionally with address and facing, and the AI identifies rooms, doors and windows, then checks them against three classical schools — Form School, Eight Mansions (Ba Zhai) and Flying Stars (Xuan Kong) — marking wealth positions, Wen Chang study spots, Peach Blossom areas and Sha Qi problem points directly on your plan, with the reasoning and concrete layout changes for each issue. The first analysis is free, and further reports are paid, with the service presenting itself as classical method plus AI precision, its methodology documented and sample reports labelled separately from real cases. Support is available by email for corrections and questions. It suits homeowners, renters and designers who want a structured, traditional feng shui reading of a specific space, with actionable suggestions rather than generic advice.