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Head-to-head · Llm Monitoring

Datadog LLM Observability vs W&B Weave

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Datadog LLM Observability #2 in Llm Monitoring 9.1/10 Free plan Free plan✓ 3 of 3 features Visit Datadog
W&B Weave #5 in Llm Monitoring 8.7/10 Free plan · 30-day trial Free planFree trial✓ 2 of 3 features Visit W&B Weave

Datadog LLM Observability leads on 0 checks, W&B Weave on 1, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreDatadog LLM Observability · 9.1/10
  • Lowest starting priceW&B Weave · $60/mo
  • Free planboth
  • Free trialonly W&B Weave
  • Most featuresDatadog LLM Observability · 3 of 3

Datadog LLM Observability scores higher on our rubric for llm monitoring: 9.1 against 8.7 out of 10; our editors rank them #2 and #5.

W&B Weave is cheaper to start at $60/mo against $160/mo. On deployment options, W&B Weave gives you Both where Datadog LLM Observability offers Cloud.

Datadog LLM Observability is the better fit for teams already using Datadog. W&B Weave is the better fit for teams monitoring LLM apps and agent behavior.

  • Datadog LLM Observability fits best

    Teams already using Datadog

  • W&B Weave fits best

    Teams monitoring LLM apps and agent behavior

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 Datadog LLM Observability 9.1/10 Visit ↗ W&B Weave 8.7/10 Visit ↗
At a glance
Editor score 9.1 8.7
Ranking #2 in Llm Monitoring #5 in Llm Monitoring
Best for Teams already using Datadog Teams monitoring LLM apps and agent behavior
Pricing model Free plan + paid Free plan + paid
Starting price $160/mo $60/mo (best)
Free plan ✓ ✓
Free trial — 30 days
Deployment Cloud Cloud, Self-hosted
Platforms Web Web
Support Docs Email, Live chat, Community, Docs
Integrations 10 integrations 30+ integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Datadog LLM Observability 3/3 · W&B Weave 2/3
LLM tracing ✓ ✓
Evaluation support ✓ ✓
Alerts ✓ (best) Not checked yet
Specs
Deployment options Cloud Both
Trace retention 15 days Not checked yet
LLM providers OpenAI, Anthropic, Gemini, Vertex AI, AWS Bedrock Not checked yet
Our review
Pros
  • Links agent traces with backend services, infrastructure, and user sessions
  • Combines evaluations, datasets, experiments, and annotations
  • Free plan includes up to 40K LLM spans per month and full feature access
  • Traces LLM calls, retrieval steps, and multi-step agent activity
  • Combines evaluations, prompt experiments, and guardrail scorers
  • Integrates with major model providers and agent frameworks
Cons
  • Cloud-only deployment
  • Free and Pro plans both retain traces for 15 days
  • Pro costs $160/month with annual billing; extra spans are metered
  • The $60/month Pro plan is for W&B Pro, not a Weave-only price
  • Weave ingestion, storage, and some usage are billed separately
  • Enterprise features such as SSO and audit logs require Enterprise
Our verdict

Datadog LLM Observability, now presented as Agent Observability, helps engineering teams monitor and troubleshoot LLM-powered applications and agents in development and production. It records model calls and workflows at span level,…

Read the review →

W&B Weave brings observability and evaluation to teams building LLM applications and production agents. It records inputs, outputs, metadata, latency, token usage, costs, tool calls, and agent activity across sessions, turns, steps, and…

Read the review →
  1. Datadog LLM ObservabilityLlm Monitoring 9.1Free plan
  2. W&B WeaveLlm Monitoring 8.7Free plan · 30-day trial

Strengths and trade-offs

  • Datadog LLM Observability — where it wins

    • Links agent traces with backend services, infrastructure, and user sessions
    • Combines evaluations, datasets, experiments, and annotations
    • Free plan includes up to 40K LLM spans per month and full feature access

    Where it doesn't

    • Cloud-only deployment
    • Free and Pro plans both retain traces for 15 days
    • Pro costs $160/month with annual billing; extra spans are metered

  • W&B Weave — where it wins

    • Traces LLM calls, retrieval steps, and multi-step agent activity
    • Combines evaluations, prompt experiments, and guardrail scorers
    • Integrates with major model providers and agent frameworks

    Where it doesn't

    • The $60/month Pro plan is for W&B Pro, not a Weave-only price
    • Weave ingestion, storage, and some usage are billed separately
    • Enterprise features such as SSO and audit logs require Enterprise
  • Datadog LLM Observability9.1/10 · Free plan

    LLM tracing and evaluation with Datadog context, plus a free plan and cloud-only deployment.

    Visit DatadogFull verdict →
  • W&B Weave8.7/10 · Free plan · 30-day trial

    Trace LLM apps and agents, evaluate outputs, and monitor cost and safety signals.

    Visit W&B WeaveFull verdict →

More comparisons

All llm monitoring comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update