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Head-to-head · LLM Observability Tools

Opik vs W&B Weave

  • Updated Oct 2026
  • Both researched from official sources
  • 8 checks side by side
Higher score Opik #4 in LLM Observability Tools 9.1/10 Free plan Free plan✓ 6 of 6 features Visit Opik
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

Opik 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 scoreOpik · 9.1/10
  • Lowest starting priceOpik · $19/mo
  • Free planboth
  • Free trialonly W&B Weave

Opik scores higher on our rubric for llm observability tools: 9.1 against 9.0 out of 10; our editors rank them #4 and #5.

Opik is cheaper to start at $19/mo against $60/mo.

Opik is the better fit for cost-conscious teams needing full-stack observability. W&B Weave is the better fit for growing teams wanting mature, broad observability.

  • Opik fits best

    Cost-conscious teams needing full-stack 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 Opik 9.1/10 Visit ↗ W&B Weave 9.0/10 Visit ↗
At a glance
Editor score 9.1 9.0
Ranking #4 in LLM Observability Tools #5 in LLM Observability Tools
Best for Cost-conscious teams needing full-stack observability Growing teams wanting mature, broad observability
Pricing model Free plan + paid Free plan + paid
Starting price $19/mo (best) $60/mo
Free plan ✓ ✓
Free trial — 30 days
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Community, Docs Email, Live chat, Community, Docs
Compliance SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML SOC 2, ISO 27001, GDPR, HIPAA, SSO/SAML
Integrations 40+ integrations 30+ integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Opik 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
  • Free self-hosted and cloud options cover core observability needs
  • Traces model calls, tools, retrieval steps, and agent actions
  • Tracks evaluations, prompts, human feedback, tokens, and model costs
  • 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
  • Enterprise pricing is custom rather than published
  • Self-hosted deployment requires your own infrastructure
  • Its broad scope may exceed teams needing only basic tracing
  • 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

Opik is an open-source LLM observability and evaluation platform from Comet for teams building chatbots, retrieval-augmented generation pipelines, and multi-step agents. It records model calls, tool invocations, retrieval steps, and agent…

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. OpikLLM Observability Tools 9.1Free plan
  2. W&B WeaveLLM Observability Tools 9.0Free plan · 30-day trial

Strengths and trade-offs

  • Opik — where it wins

    • Free self-hosted and cloud options cover core observability needs
    • Traces model calls, tools, retrieval steps, and agent actions
    • Tracks evaluations, prompts, human feedback, tokens, and model costs

    Where it doesn't

    • Enterprise pricing is custom rather than published
    • Self-hosted deployment requires your own infrastructure
    • Its broad scope may exceed teams needing only basic tracing

  • 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
  • Opik9.1/10 · Free plan

    A broad, cost-conscious stack for tracing, evaluation, prompts, monitoring, and agent debugging.

    Visit OpikFull 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