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Head-to-head · LLM Observability Tools

Arize AX vs Langfuse

  • Updated Oct 2026
  • Both researched from official sources
  • 8 checks side by side
Higher score Arize AX #1 in LLM Observability Tools 9.4/10 Free plan Free plan✓ 6 of 6 features Visit Arize AX
Langfuse #2 in LLM Observability Tools 9.3/10 Free plan Free plan✓ 6 of 6 features Visit Langfuse

Arize AX leads on 0 checks, Langfuse on 1, and 7 are even. Who comes out ahead on the 8 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreArize AX · 9.4/10
  • Lowest starting priceLangfuse · $29/mo
  • Free planboth

Arize AX scores higher on our rubric for llm observability tools: 9.4 against 9.3 out of 10; our editors rank them #1 and #2.

Langfuse is cheaper to start at $29/mo against $50/mo.

Arize AX is the better fit for teams wanting broad, production-ready LLM observability. Langfuse is the better fit for teams seeking balanced open-source observability.

  • Arize AX fits best

    Teams wanting broad, production-ready LLM observability

  • Langfuse fits best

    Teams seeking balanced open-source observability

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Side by side

Feature Arize AX 9.4/10 Visit ↗ Langfuse 9.3/10 Visit ↗
At a glance
Editor score 9.4 9.3
Ranking #1 in LLM Observability Tools #2 in LLM Observability Tools
Best for Teams wanting broad, production-ready LLM observability Teams seeking balanced open-source observability
Pricing model Free plan + paid Free plan + paid
Starting price $50/mo $29/mo (best)
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Community, Docs Email, Live chat, Community, Docs
Compliance SOC 2, GDPR, HIPAA, SSO/SAML SOC 2, ISO 27001, GDPR, HIPAA
Integrations 18 integrations 100+ integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Arize AX 6/6 · Langfuse 6/6
LLM tracing ✓ ✓
LLM evaluations ✓ ✓
Prompt management ✓ ✓
Agent tracing ✓ ✓
Retrieval tracing ✓ ✓
Token cost tracking ✓ ✓
Specs
Deployment options Both Both
Our review
Pros
  • Covers tracing, evaluations, prompts, agents, RAG, and cost tracking
  • Supports SaaS and self-hosted deployment with Enterprise
  • Connects with major LLM providers and agent frameworks
  • Traces agents, tools, retrieval steps, prompts, costs, and evaluations
  • Supports managed cloud and self-hosted deployment
  • Includes OpenTelemetry, SDK, framework, model, and workflow integrations
Cons
  • Free plan limits usage to 10 Signal issues per month
  • Enterprise pricing is custom
  • Self-hosted deployment is available only on Enterprise
  • Hobby limits usage, data access, and seats
  • Enterprise SSO and RBAC require the Teams Add-on
  • Advanced governance and SLA features are reserved for Enterprise
Our verdict

Arize AX is an AI engineering platform for teams building AI agents and applications. It captures production traces, evaluates LLM, agent, human, and code quality signals, and supports experiments comparing prompts, models, and agent…

Read the review →

Langfuse is an open-source platform for teams building and operating LLM applications. It captures hierarchical traces for model calls, agents, tool calls, and retrieval steps, while also covering prompt versioning, evaluations, datasets,…

Read the review →
  1. Arize AXLLM Observability Tools 9.4Free plan
  2. LangfuseLLM Observability Tools 9.3Free plan

Strengths and trade-offs

  • Arize AX — where it wins

    • Covers tracing, evaluations, prompts, agents, RAG, and cost tracking
    • Supports SaaS and self-hosted deployment with Enterprise
    • Connects with major LLM providers and agent frameworks

    Where it doesn't

    • Free plan limits usage to 10 Signal issues per month
    • Enterprise pricing is custom
    • Self-hosted deployment is available only on Enterprise

  • Langfuse — where it wins

    • Traces agents, tools, retrieval steps, prompts, costs, and evaluations
    • Supports managed cloud and self-hosted deployment
    • Includes OpenTelemetry, SDK, framework, model, and workflow integrations

    Where it doesn't

    • Hobby limits usage, data access, and seats
    • Enterprise SSO and RBAC require the Teams Add-on
    • Advanced governance and SLA features are reserved for Enterprise

More comparisons

All LLM observability tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update