helicone

Helicone/helicone

๐ŸงŠ Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 ๐Ÿ“

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TypeScript Apache-2.0Last pushed Jul 5, 2026

๐ŸงŠ Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 ๐Ÿ“

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npm install helicone

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๐Ÿ” Observability๐Ÿ•ธ๏ธ Agent Tracing๐Ÿš‚ LLM Routing
๐Ÿ’ฐ Cost & Latency Tracking๐Ÿ“š Datasets & Fine-tuning๐ŸŽ›๏ธ Automatic Fallbacks

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Docs โ€ข Changelog โ€ข Bug reports โ€ข See Helicone in Action! (Free)

Helicone is an AI Gateway & LLM Observability Platform for AI Engineers

  • ๐ŸŒ AI Gateway: Access 100+ AI models with 1 API key through the OpenAI API with intelligent routing and automatic fallbacks. Get started in 2 minutes.
  • ๐Ÿ”Œ Quick integration: One-line of code to log all your requests from OpenAI, Anthropic, LangChain, Gemini, Vercel AI SDK, and more.
  • ๐Ÿ“Š Observe: Inspect and debug traces & sessions for agents, chatbots, document processing pipelines, and more
  • ๐Ÿ“ˆ Analyze: Track metrics like cost, latency, quality, and more. Export to PostHog in one-line for custom dashboards
  • ๐ŸŽฎ Playground: Rapidly test and iterate on prompts, sessions and traces in our UI.
  • ๐Ÿง  Prompt Management: Version prompts using production data. Deploy prompts through the AI Gateway without code changes. Your prompts remain under your control, always accessible.
  • ๐ŸŽ›๏ธ Fine-tune: Fine-tune with one of our fine-tuning partners: OpenPipe or Autonomi (more coming soon)
  • ๐Ÿ›ก๏ธ Enterprise Ready: SOC 2 and GDPR compliant

๐ŸŽ Generous monthly free tier (10k requests/month) - No credit card required!

Open Sourced LLM Observability & AI Gateway Platform

Quick Start โšก๏ธ

  1. Get your API key by signing up here and add credits at helicone.ai/credits

  2. Update the baseURL in your code and add your API key.

    import OpenAI from "openai";
    
    const client = new OpenAI({
      baseURL: