Model Ruler is a deterministic AI architecture cost-planning suite for LLM, RAG, eval, observability, self-hosting, and agent-loop decisions. Same inputs, same outputs, every time.
Use the calculators directly in the browser or from supported agent surfaces. Model Ruler publishes source dates, formulas, and review notes so outputs can be checked. Cloudflare Analytics Engine records first-party operational metrics such as tool name, latency, and severity; calculator inputs, account details, provider credentials, and user identifiers are not stored by Model Ruler.