Model Ruler does not ask for API keys, provider login, tracing SDK installation, or account signup. Calculator inputs are processed request-scoped and not persisted by Model Ruler. Cloudflare, our infrastructure provider, processes standard request metadata such as IP address, country, user agent, request path, and timestamps for routing, security, and reliability. Cloudflare Analytics Engine captures tool name, latency, and severity — no input payloads and no first-party user identifiers. This service is not directed at or available to EEA or UK jurisdictions. We do not sell personal information or share it for cross-context behavioral advertising.