Open-source alternatives to Helicone

Langfuse

LLM engineering platform — tracing, prompt management, cost tracking.

MIT-licensed alternative to LangSmith. Full observability for LLM chains, version-controlled prompts, A/B testing, and dataset evaluation.

Laminar

Agent observability and evaluation platform — signal alerts, trace debugging, and automated evals for LLM products

Open-source LLM observability platform — trace debugging, signal alerts, and automated evaluations for AI products. Alternative to LangSmith and Helicone.

OpenLIT

OpenTelemetry-native LLM observability — tracing, evaluation, prompt management, and cost tracking

Monitor, debug, and scale LLM applications with ease