Lunar.dev AI Gateway vs Promptfoo MCP Proxy: Side-by-Side Comparison (2026)

Lunar.dev AI Gateway: API gateway for managing, securing, and observing outbound LLM traffic. built by Lunar.dev. Core capabilities include Rate limiting for LLM API calls per user, app, or agent, Priority queue for AI workloads to manage request urgency, Data sanitization to redact sensitive data from prompts and tool inputs..

Promptfoo MCP Proxy: Proxy layer for controlling and monitoring MCP server access in AI apps. built by Promptfoo. Core capabilities include MCP server whitelisting to block unapproved servers, Granular access control per user and application, Real-time monitoring of MCP interactions..

Both serve the Agentic AI Security market but differ in approach, feature depth, and target audience.

Lunar.dev AI Gateway differentiates with Rate limiting for LLM API calls per user, app, or agent, Priority queue for AI workloads to manage request urgency, Data sanitization to redact sensitive data from prompts and tool inputs. Promptfoo MCP Proxy differentiates with MCP server whitelisting to block unapproved servers, Granular access control per user and application, Real-time monitoring of MCP interactions.

Lunar.dev AI Gateway is developed by Lunar.dev. Promptfoo MCP Proxy is developed by Promptfoo. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Lunar.dev AI Gateway and Promptfoo MCP Proxy serve similar Agentic AI Security use cases: both are Agentic AI Security tools, both cover MCP Security, Agentic AI Security, AI Gateway. Key differences: Lunar.dev AI Gateway is Free while Promptfoo MCP Proxy is Commercial. Review the feature comparison above to determine which fits your requirements.