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Head-to-head · LLM Observability Tools

Langfuse vs W&B Weave

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

Langfuse leads on 1 check, W&B Weave on 0, 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 scoreLangfuse · 9.3/10
  • Lowest starting priceLangfuse · $29/mo
  • Free planboth
  • Free trialonly W&B Weave

Langfuse scores higher on our rubric for llm observability tools: 9.3 against 9.0 out of 10; our editors rank them #2 and #5.

Langfuse is cheaper to start at $29/mo against $60/mo.

Langfuse is the better fit for teams seeking balanced open-source observability. W&B Weave is the better fit for growing teams wanting mature, broad observability.

  • Langfuse fits best

    Teams seeking balanced open-source observability

  • W&B Weave fits best

    Growing teams wanting mature, broad observability

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 Langfuse 9.3/10 Visit ↗ W&B Weave 9.0/10 Visit ↗
At a glance
Editor score 9.3 9.0
Ranking #2 in LLM Observability Tools #5 in LLM Observability Tools
Best for Teams seeking balanced open-source observability Growing teams wanting mature, broad observability
Pricing model Free plan + paid Free plan + paid
Starting price $29/mo (best) $60/mo
Free plan ✓ ✓
Free trial — 30 days
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Live chat, Community, Docs Email, Live chat, Community, Docs
Compliance SOC 2, ISO 27001, GDPR, HIPAA SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML
Integrations 100+ integrations 30+ integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Langfuse 6/6 · W&B Weave 6/6
LLM tracing ✓ ✓
LLM evaluations ✓ ✓
Prompt management ✓ ✓
Agent tracing ✓ ✓
Retrieval tracing ✓ ✓
Token cost tracking ✓ ✓
Specs
Deployment options Both Both
Our review
Pros
  • Traces agents, tools, retrieval steps, prompts, costs, and evaluations
  • Supports managed cloud and self-hosted deployment
  • Includes OpenTelemetry, SDK, framework, model, and workflow integrations
  • 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
Cons
  • 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
  • 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
Our verdict

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 →

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 →
  1. LangfuseLLM Observability Tools 9.3Free plan
  2. W&B WeaveLLM Observability Tools 9.0Free plan · 30-day trial

Strengths and trade-offs

  • 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

  • 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
  • Langfuse9.3/10 · Free plan

    A broad observability platform with open-source deployment and accessible paid tiers.

    Visit LangfuseFull verdict →
  • 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 →

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