Semantic Function Maker
Turn plain English into typed, testable AI function specs.
Describe what you need. The AI generates a complete .sf.json spec — typed inputs, structured JSON output, system message, and prompt template — saved as a single JSON file you can run, serve as an API, or generate code from.
Try an example:
Your spec will appear here
Describe a function above and click Create with AI to generate a complete .sf.json specification with typed inputs, outputs, and prompt template.
See a working app built on a semantic function →
The Haiku Writer is a complete application powered by a single .sf.json spec.