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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- LLM request logging & debugging — Capture every prompt and completion with full metadata to reproduce and diagnose production issues
- Cost & token usage monitoring — Track spend broken down by model, user, or feature to optimize LLM budget allocation
- Multi-provider gateway routing — Route traffic across OpenAI, Anthropic, Azure, and other providers through a single unified proxy endpoint
- Prompt versioning & experimentation — Use Datasets and the Playground to A/B test prompt variants against real production traffic
- Rate limiting per user or API key — Enforce usage quotas on a per-user basis using Helicone request headers without custom backend logic
- Session & user analytics — Tag requests with session and user IDs to reconstruct conversation flows and analyze user-level LLM behavior