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Head-to-head · LLM Observability Tools

W&B Weave vs LangSmith

  • Updated Oct 2026
  • Both researched from official sources
  • 8 checks side by side
Higher score W&B Weave #5 in LLM Observability Tools 9.0/10 Free plan · 30-day trial Free planFree trial✓ 6 of 6 features Visit W&B Weave
LangSmith #6 in LLM Observability Tools 8.9/10 Free plan Free plan✓ 6 of 6 features Visit LangSmith

W&B Weave leads on 0 checks, LangSmith 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 scoreW&B Weave · 9.0/10
  • Lowest starting priceLangSmith · $39/seat/mo
  • Free planboth
  • Free trialonly W&B Weave

W&B Weave scores higher on our rubric for llm observability tools: 9.0 against 8.9 out of 10; our editors rank them #5 and #6.

LangSmith is cheaper to start at $39/mo against $60/mo.

W&B Weave is the better fit for growing teams wanting mature, broad observability. LangSmith is the better fit for langChain-centric teams needing an integrated platform.

  • W&B Weave fits best

    Growing teams wanting mature, broad observability

  • LangSmith fits best

    LangChain-centric teams needing an integrated platform

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature W&B Weave 9.0/10 Visit ↗ LangSmith 8.9/10 Visit ↗
At a glance
Editor score 9.0 8.9
Ranking #5 in LLM Observability Tools #6 in LLM Observability Tools
Best for Growing teams wanting mature, broad observability LangChain-centric teams needing an integrated platform
Pricing model Free plan + paid Free plan + paid
Starting price $60/mo $39/seat/mo (best)
Free plan ✓ ✓
Free trial 30 days —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Live chat, Community, Docs Community, Email, Tickets, Docs · 24/7
Compliance SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML
Integrations 30+ integrations 7 integrations
Built for Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features W&B Weave 6/6 · LangSmith 6/6
LLM tracing ✓ ✓
LLM evaluations ✓ ✓
Prompt management ✓ ✓
Agent tracing ✓ ✓
Retrieval tracing ✓ ✓
Token cost tracking ✓ ✓
Specs
Deployment options Both Both
Our review
Pros
  • Detailed tracing for LLM calls, agents, RAG steps, costs, and latency
  • Evaluations, scorers, prompt versioning, and experimentation in one platform
  • Web, API, and self-hosted deployment with broad framework integrations
  • 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
Cons
  • Weave data ingestion, storage, and some usage are billed separately
  • The Free plan has community support rather than priority support
  • Its broad feature set may exceed the needs of teams seeking simple tracing
  • Usage-based charges apply after included trace allowances
  • Enterprise pricing is custom
  • Named integrations are narrower than some alternatives
Our verdict

W&B Weave is an observability and evaluation platform for teams building LLM applications and production agents. It records inputs, outputs, metadata, latency, token usage, costs, tool calls, and multi-step agent activity. The platform…

Read the review →

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 →
  1. W&B WeaveLLM Observability Tools 9.0Free plan · 30-day trial
  2. LangSmithLLM Observability Tools 8.9Free plan

Strengths and trade-offs

  • W&B Weave — where it wins

    • Detailed tracing for LLM calls, agents, RAG steps, costs, and latency
    • Evaluations, scorers, prompt versioning, and experimentation in one platform
    • Web, API, and self-hosted deployment with broad framework integrations

    Where it doesn't

    • Weave data ingestion, storage, and some usage are billed separately
    • The Free plan has community support rather than priority support
    • Its broad feature set may exceed the needs of teams seeking simple tracing

  • 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
  • W&B Weave9.0/10 · Free plan · 30-day trial

    A broad observability suite for teams tracing, evaluating, and monitoring LLM applications.

    Visit W&B WeaveFull verdict →
  • LangSmith8.9/10 · Free plan

    A broad LLM observability platform with especially strong LangChain ecosystem fit.

    Visit LangSmithFull verdict →

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