SpinGreen

SpinGreen is a browser-based prototyping tool that transforms casino game math specifications into instantly playable prototypes. Game studios, designers, and producers can upload reel strips and paytable JSON to test game rhythm, volatility, and feature feel before commissioning art or writing client code.

The platform eliminates the communication bottleneck between math designers and engine teams by providing real-time telemetry inspection, shareable read-only URLs, and session analytics including RTP, hit frequency, and dry streaks. With zero client dependencies and no login required, teams can collaborate on mathematical models and feel the actual player experience rather than relying on spreadsheets and simulations.

Key features include support for 5×3 and 5×4 grids, standard JSON specification format, multiple bet and speed options, and turnaround times under 15 minutes from math spec to playable game.