Respan

Respan, built by Y Combinator-backed Keywords AI, Inc., is an AI observability and management platform that helps developers trace, evaluate, and optimize LLM applications, routing LLM traffic through a unified gateway with real-time monitoring and quality assurance. The Gateway routes requests to 1,000+ models across providers with automatic fallbacks and response caching for 99.99% uptime, observability and tracing captures every LLM call, tool run, and agent step showing latency, cost, and tokens, and evaluations score outputs using LLM judges, deterministic checks, and human review. Monitoring tracks requests, errors, costs, and latency with real-time Slack, email, or webhook alerts, and prompt management enables version control and optimization of prompts across the platform.