Validated
Zod-validated input; one definition gives types, validation, and schemas.
Fitness Tools
Validated, self-describing fitness calculators — runs natively in the browser and on the server.
Multi-method
Several published formulas per metric, with a consensus across them.
Isomorphic
Runs in the browser and on the server. One small dependency (zod).
Self-describing
The same schemas power the HTTP API catalog and OpenAPI.
Agent-ready
An MCP server exposes every calculator as a tool for LLM clients.