Helicone
Evaluation & observability · Freemium
About
An open-source LLM observability proxy that logs requests, costs and latency with a one-line integration.
Key features
- Proxy-based request logging
- Cost tracking
- Caching
- Prompt versioning
Best for
- — Quick cost and usage visibility
- — Caching and rate limiting LLM calls
- Pricing
- Freemium
- Platforms
- Web, API, Self-hosted
- Works with
- OpenAI, Anthropic
- Last checked
- 2026-10-29
- Status
- Listed, not yet tested
Our take
Very easy to adopt. A proxy sits in your request path, so check reliability and data handling.
Features and pricing change often — confirm on helicone.ai before you commit.
Alternatives to Helicone
| Tool | Type | Pricing | Best for |
|---|---|---|---|
| Helicone (this) | Evaluation & observability | Freemium | Quick cost and usage visibility |
| Langfuse | Evaluation & observability | Open source | Tracing LLM apps in production |
| LangSmith | Evaluation & observability | Freemium | LangChain and LangGraph users |
| Braintrust | Evaluation & observability | Freemium | Systematic evals before shipping |
| Arize Phoenix | Evaluation & observability | Open source | Local debugging of LLM traces |
| W&B Weave | Evaluation & observability | Freemium | Teams already on Weights & Biases |
| promptfoo | Evaluation & observability | Open source | Prompt regression tests in CI |