Helicone
Partial infoOpen-source LLM logging and monitoring via a proxy.
Helicone logs and monitors LLM requests, most simply through a one-line proxy that also enables caching and rate limiting. It is open-source and self-hostable, with a managed cloud.
License
Open source (Apache-2.0)
Deployment
Managed, Self-hosted
Pricing
Free tier; usage-based paid plans. Self-host is free.
SDKs / languages
Any (proxy), Python, TypeScript
Founded
2022
Strengths
- One-line proxy integration
- Caching and rate limiting built in
- Open-source and self-hostable
Limitations
- Proxy adds a network hop
- Evals less deep than eval-first tools
Also compared in
Alternatives
Arize Phoenix
Open-source LLM tracing and evaluation, OpenTelemetry-native.
Braintrust
Eval-first platform for iterating on LLM quality.
Datadog LLM Observability
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Langfuse
Open-source LLM observability, evals, and prompt management.
LangSmith
Tracing, evals, and prompt management from the LangChain team.
Opik
Open-source LLM evaluation and tracing from Comet.
Facts verified 19 July 2026. Neutral summary, not an endorsement; verify current details with the vendor.