Physics Sandbox Builder

A browser-based tool for building and sharing interactive physics machines and contraptions. Users can create Rube Goldberg-style machines visually without coding, then share them via shareable links. Great for education, entertainment, and creative play.

Browser-based physics sandboxes have existed for over a decade — Algodoo and The Powder Toy built loyal audiences long before this — so the market timing argument is weak unless there's a clear angle around embeddability, AI-assisted building, or curriculum alignment that incumbents haven't addressed. The closest substitute is Algodoo, which remains actively used in classrooms and has a head start on the educational credibility that would drive institutional licensing. A $1k–5k/mo revenue band is plausible only through a freemium model with export or embed gating, since one-time purchases tend to stall and the audience skews toward students and hobbyists with low willingness to pay. The biggest risk is the content loop: without a critical mass of shared contraptions worth discovering, the "share via link" mechanic never generates organic growth and the product becomes a toy people open once.