Helicone
Free tierAI Gateway & LLM Observability for building reliable AI applications
Free tier available·Technical·API available·Open source
Key strengths
Unified AI gateway supporting OpenAI, Anthropic, Azure, and many more providersLLM observability with request logging, session tracking, and user analyticsPrompt management with datasets and playground for iterative improvementRate limiting and alerting for production reliabilityFast integration — route traffic through Helicone with a single line change
Free tier + paid plans
San Francisco, United States
Founded 2023
Self-hostable
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Helicone operates as a high-performance AI gateway and observability layer that proxies LLM API calls with minimal latency overhead. It integrates with providers including OpenAI, Anthropic, Azure OpenAI, LiteLLM, Anyscale, Together AI, and OpenRouter via a simple base URL swap or SDK wrapper. The platform captures full request/response logs, enabling rich dashboards with metrics on cost, latency, token usage, error rates, and custom segments. Helicone also provides a Datasets and Playground feature for prompt engineering, plus rate limiting and alerting primitives for production safeguards.