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
Compare Helicone alternatives
Helicone is itself an open-source (Apache-2.0) LLM observability platform that can be self-hosted, with a free tier capped at 10,000 requests a month and paid plans starting at $20 per seat. Teams comparing observability tools for LLM applications weigh it against other options depending on whether they want tracing alone or a fuller prompt-management and evaluation workflow.
Langfuse covers similar ground — tracing, prompt management, and cost tracking — and is a common side-by-side comparison. OpenLIT is built specifically around OpenTelemetry-native instrumentation if you already have an OTel pipeline, while Laminar leans more toward agent-specific evaluation and trace debugging.
FAQ
Is there a free, open-source alternative to Helicone?
Helicone itself is already free and open source. If you want to compare, Langfuse, OpenLIT, and Laminar are also open source and free to self-host.
What's the best open-source alternative to Helicone?
Langfuse is the closest match for tracing, prompt management, and cost tracking together. OpenLIT is the better pick if you want OpenTelemetry-native instrumentation.
What are the top open-source alternatives to Helicone?
Browse all open-source alternatives to Helicone above, or explore the full Developer Tools category for more options.