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Opik vs Langfuse

OpikLangfuse

Bottom line: Opik for teams wanting open-source eval plus tracing; Langfuse for teams wanting open-source LLM observability.

OpikOpik

Open-source LLM evaluation, tracing, and observability by Comet.

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LangfuseLangfuse

Open-source LLM observability and evaluation

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Votes00
PricingFreemiumFreemium
CategoryCodingCoding
Tags
llm-evaluationobservabilityopen-sourcetracingmonitoring
llm-observabilityopen-sourcetracingevaluationprompt-management
Best for
  • Teams wanting open-source eval plus tracing
  • LLM engineers doing eval-driven development
  • Organizations that value self-hostability
  • Teams wanting open-source LLM observability
  • Data-sensitive teams needing self-hosting
  • Prompt and evaluation workflows
Pros
  • Full platform is Apache-2.0 and free to self-host
  • Combines tracing and evaluation in one tool
  • LLM-as-a-judge and many automated metrics
  • Fast-growing, widely adopted open-source project
  • Integrates with Comet's ML ecosystem
  • Open source with nearly all features MIT-licensed
  • Self-host the full product free, no seat or usage caps
  • Framework-agnostic (works with or without LangChain)
  • Strong tracing, prompt management, and evaluation
  • Managed cloud with a free tier available
Cons
  • Crowded, competitive category
  • Self-hosting requires running infrastructure
  • Managed cloud limits (spans, seats) on lower tiers
  • Evaluation quality depends on judge configuration
  • Deep value tied to adopting the workflow
  • Self-hosting still requires running infrastructure
  • Enterprise compliance features are commercial
  • Cloud Pro tier jumps significantly in price
  • Focused on observability, not app building
  • Analytics depth may need tuning for large scale

Comparison generated from each tool's listing. Add or remove tools above to change it.