Terms
| The engines | The light, heat, air and spectral engines (js/engine/), their tests and the validation registry: MIT licence, free for any use, commercial included. They are the open core of the tool. |
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| The tool and the Rhino plugin | The page, its cards and the Rhino and Grasshopper plugin: PolyForm Noncommercial License 1.0.0. Free for teaching, study, research and personal projects, and for public research organisations, schools and charities. |
| Data files and texts | CC BY-NC 4.0. Sources from others keep their own terms (NOTICE.md). |
| Commercial use | Paid consultancy or design work, a commercial product or service, or a company's use for its own business needs a written licence. Request one below. |
Full texts: LICENSE, js/engine/LICENSE, NOTICE.md. Copies received before 31 October 2026 keep the MIT and CC BY 4.0 terms they came with.