W&B Weave vs LangWatch

W&B Weave9.0Visit LangWatch8.8Visit

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

vs

LangWatch #7 in LLM Observability Tools 8.8/10 Free plan Free plan✓ 6 of 6 features Visit LangWatch

• W&B Weave fits best

  Growing teams wanting mature, broad observability

• LangWatch fits best

  Teams needing affordable agent and RAG visibility

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Side by side

Feature	W&B Weave 9.0/10 Visit ↗	LangWatch 8.8/10 Visit ↗
At a glance
Editor score	9.0	8.8
Ranking	#5 in LLM Observability Tools	#7 in LLM Observability Tools
Best for	Growing teams wanting mature, broad observability	Teams needing affordable agent and RAG visibility
Pricing model	Free plan + paid	Free plan + paid
Starting price	$60/mo	€29/seat/mo
Free plan	✓	✓
Free trial	30 days	—
Deployment	Cloud, Self-hosted	Cloud, Self-hosted
Platforms	Web	Web, Linux
Support	Email, Live chat, Community, Docs	Community, Live chat, Docs
Compliance	SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML	SOC 2, ISO 27001, GDPR, 2FA
Integrations	30+ integrations	26+ integrations
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features W&B Weave 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	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	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	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	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	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 →	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 →

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

• 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

• 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 →
• LangWatch8.8/10 · Free plan

  Affordable visibility for agents, RAG pipelines, evaluations, and LLM costs.

  Visit LangWatchFull verdict →