These tools competes with

LangfusevsArize Phoenix

OSS LLM engineering platform (acquired by ClickHouse, Jan 2026) versus ML/LLM observability and evaluation platform

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Choose Langfuse when…

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

Choose Arize Phoenix when…

  • •You need ML observability beyond just LLMs
  • •RAG pipeline tracing and eval integration is required
  • •You're running experiments and need a notebook-friendly tool

Side-by-side comparison

Field
Langfuse
Arize Phoenix
Category
Observability
Observability
Type
Open Source
Open Source
Free Tier
✓ Yes
✓ Yes
Pricing Plans
Cloud: $59/mo
Enterprise: Custom
GitHub Stars
⭐ 7,000
⭐ 4,000
Health
●95 — Active
●90 — Active

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 ↗

Arize Phoenix

Open-source observability platform for ML and LLM applications. Supports tracing, evaluation, and dataset management with a strong eval framework.

Website ↗GitHub ↗

Shared Connections2 tools both integrate with

HeliconeLangWatch

Only Langfuse (29)

Claude CodeCrewAICursorLangGraphLangChainOpenHandsAutoGenLlamaIndexDifyMastra

Only Arize Phoenix (1)

Langfuse

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