These tools competes with

OpikvsLangfuse

Open-source LLM tracing and evaluation platform by Comet versus OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)

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Choose Opik when…

  • •want OSS observability with built-in eval metrics
  • •already using Comet for ML experiment tracking
  • •need hallucination detection out of the box

Choose Langfuse when…

  • •You want open-source LLM observability
  • •Self-hosting your tracing stack is important
  • •You need cost tracking across models and users

Side-by-side comparison

Field
Opik
Langfuse
Category
Observability
Observability
Type
Open Source
Open Source
Free Tier
✓ Yes
✓ Yes
Pricing Plans
OSS: FreeCloud: Free tier + pay as you go
Cloud: $59/mo
GitHub Stars
⭐ 4,200
⭐ 7,000
Health
●100 — Active
●95 — Active

Opik

Opik is an open-source LLM observability platform from Comet that provides detailed tracing, prompt tracking, and automated evaluation for AI applications. One-line integration captures every LLM call, cost, and output with built-in eval metrics including hallucination detection.

Website ↗GitHub ↗

Langfuse

Open-source platform for tracing, evaluations, and prompt management. Self-hostable alternative to LangSmith with broad framework support. Acquired by ClickHouse in January 2026; OSS core continues with deeper ClickHouse-backed analytics.

Website ↗GitHub ↗

Only Opik (2)

LangfuseMaxim AI

Only Langfuse (31)

Claude CodeCrewAICursorLangGraphLangChainOpenHandsAutoGenLlamaIndexDifyMastra

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