Helicone
An open-source AI gateway and LLM observability platform: routing, fallbacks, tracing and cost tracking.
Sources and review
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Adding cost, latency and trace visibility to an LLM app with minimal code changes.
About Helicone
Helicone combines an AI gateway, which reaches more than 100 models through the OpenAI API with routing and automatic fallbacks, with an observability platform that logs requests from OpenAI, Anthropic, LangChain, Gemini and the Vercel AI SDK in one line of code. It traces agent sessions, tracks cost and latency, offers a prompt playground and datasets, and can be self-hosted or used in the cloud.
Helicone is an open-source project written primarily in TypeScript, with 6.2k stars on GitHub. It was last updated in September 2026.
