LangSmith vs Phoenix by Arize

Detailed side-by-side comparison to help you choose the right tool

LangSmith

🔴Developer

Business Analytics

Tracing, evaluation, and observability for LLM apps and agents.

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Starting Price

Free
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Phoenix by Arize

🔴Developer

Business Analytics

ML observability platform specialized for LLM applications, providing evaluation, monitoring, and debugging tools for AI agents in production.

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Starting Price

Free
Full ReviewVisit Site

Feature Comparison

Scroll horizontally to compare details.

FeatureLangSmithPhoenix by Arize
CategoryBusiness AnalyticsBusiness Analytics
Pricing Plans15 tiers24 tiers
Starting PriceFreeFree
Key Features
  • • Workflow Runtime
  • • Tool and API Connectivity
  • • State and Context Handling

    LangSmith - Pros & Cons

    Pros

    • ✓Comprehensive observability with detailed trace visualization
    • ✓Native MCP support for universal agent tool deployment
    • ✓Generous free tier for individual developers and small projects
    • ✓No-code Agent Builder reduces technical barriers
    • ✓Managed deployment infrastructure with production-ready scaling
    • ✓Strong integration with entire LangChain ecosystem

    Cons

    • ✗Primarily designed for LangChain applications (limited framework support)
    • ✗Steep pricing jump from Plus to Enterprise tier
    • ✗Pay-as-you-go model can become expensive for high-volume applications
    • ✗Enterprise features require annual contracts
    • ✗14-day retention on base traces may be insufficient for some use cases

    Phoenix by Arize - Pros & Cons

    Pros

    • ✓Open-source core with no vendor lock-in for self-hosted deployments
    • ✓Built on OpenTelemetry for standardized, interoperable instrumentation
    • ✓Specialized hallucination detection addresses a critical LLM production concern
    • ✓Experiment playground enables rapid prompt iteration

    Cons

    • ✗Arize AX cloud pricing based on span volume can become costly for data-heavy applications
    • ✗Self-hosted deployment requires infrastructure management expertise
    • ✗Steeper learning curve compared to simpler logging solutions

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    🔒 Security & Compliance Comparison

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    Security FeatureLangSmithPhoenix by Arize
    SOC2✅ Yes—
    GDPR✅ Yes—
    HIPAA——
    SSO✅ Yes—
    Self-Hosted🔀 Hybrid—
    On-Prem✅ Yes—
    RBAC✅ Yes—
    Audit Log✅ Yes—
    Open Source❌ No—
    API Key Auth✅ Yes—
    Encryption at Rest✅ Yes—
    Encryption in Transit✅ Yes—
    Data ResidencyUS, EU—
    Data Retentionconfigurable—
    🦞

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    Ready to Choose?

    Read the full reviews to make an informed decision

    Review LangSmithReview Phoenix by Arize