Helicone

Helicone is an open-source LLM observability platform that gives AI developers the visibility they need to build reliable, production-ready applications with confidence. If you've ever shipped an AI feature and had no idea why it was behaving unexpectedly or costing more than expected, Helicone fixes that. With just a one-line integration, you get full access to cost tracking, agent tracing, prompt management, and everything else you need to monitor and debug your LLM applications in production. It's an all-in-one platform for teams that take AI quality seriously — giving you the data and insights to continuously improve your models and catch issues before they reach your users.