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Head-to-head · LLM Observability Tools

LangSmith vs LangWatch

  • Updated Oct 2026
  • Both researched from official sources
  • 7 checks side by side
Higher score LangSmith #6 in LLM Observability Tools 8.9/10 Free plan Free plan✓ 6 of 6 features Visit LangSmith
LangWatch #7 in LLM Observability Tools 8.8/10 Free plan Free plan✓ 6 of 6 features Visit LangWatch

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

Our verdict

  • Highest scoreLangSmith · 8.9/10
  • Free planboth

LangSmith scores higher on our rubric for llm observability tools: 8.9 against 8.8 out of 10; our editors rank them #6 and #7.

LangSmith is the better fit for langChain-centric teams needing an integrated platform. LangWatch is the better fit for teams needing affordable agent and RAG visibility.

  • LangSmith fits best

    LangChain-centric teams needing an integrated platform

  • LangWatch fits best

    Teams needing affordable agent and RAG visibility

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Side by side

Feature LangSmith 8.9/10 Visit ↗ LangWatch 8.8/10 Visit ↗
At a glance
Editor score 8.9 8.8
Ranking #6 in LLM Observability Tools #7 in LLM Observability Tools
Best for LangChain-centric teams needing an integrated platform Teams needing affordable agent and RAG visibility
Pricing model Free plan + paid Free plan + paid
Starting price $39/seat/mo €29/seat/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web, Linux
Support Community, Email, Tickets, Docs · 24/7 Community, Live chat, Docs
Compliance SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML SOC 2, ISO 27001, GDPR, 2FA
Integrations 7 integrations 26+ integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features LangSmith 6/6 · LangWatch 6/6
LLM tracing ✓ ✓
LLM evaluations ✓ ✓
Prompt management ✓ ✓
Agent tracing ✓ ✓
Retrieval tracing ✓ ✓
Token cost tracking ✓ ✓
Specs
Deployment options Both Both
Our review
Pros
  • Tracing, evaluations, prompt management, datasets, and monitoring in one platform
  • Agent and tool-call tracing alongside human feedback workflows
  • Cloud, hybrid, and self-hosted deployment options
  • Nested agent tracing with execution graphs and cost tracking
  • Evaluations, guardrails, simulations, and prompt versioning in one platform
  • Broad SDK, framework, OpenTelemetry, and self-hosted deployment support
Cons
  • Usage-based charges apply after included trace allowances
  • Enterprise pricing is custom
  • Named integrations are narrower than some alternatives
  • Developer includes 50k events monthly and 14-day data access
  • Enterprise capabilities require a custom plan
  • The feature set may exceed the needs of teams wanting basic tracing only
Our verdict

LangSmith is a commercial platform for developing, testing, monitoring, evaluating, and deploying LLM applications and agents. It is particularly suited to teams building with LangChain or LangGraph, while also supporting applications…

Read the review →

LangWatch is an LLM engineering and observability platform for teams building AI agents and applications. It records LLM and agent traces with nested spans and execution graphs, tracks tokens, model costs, and latency, and captures RAG…

Read the review →
  1. LangSmithLLM Observability Tools 8.9Free plan
  2. LangWatchLLM Observability Tools 8.8Free plan

Strengths and trade-offs

  • LangSmith — where it wins

    • Tracing, evaluations, prompt management, datasets, and monitoring in one platform
    • Agent and tool-call tracing alongside human feedback workflows
    • Cloud, hybrid, and self-hosted deployment options

    Where it doesn't

    • Usage-based charges apply after included trace allowances
    • Enterprise pricing is custom
    • Named integrations are narrower than some alternatives

  • LangWatch — where it wins

    • Nested agent tracing with execution graphs and cost tracking
    • Evaluations, guardrails, simulations, and prompt versioning in one platform
    • Broad SDK, framework, OpenTelemetry, and self-hosted deployment support

    Where it doesn't

    • Developer includes 50k events monthly and 14-day data access
    • Enterprise capabilities require a custom plan
    • The feature set may exceed the needs of teams wanting basic tracing only

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