Suggestions appear as you type. Use the up and down arrows to choose one and Enter to open it.

This page's audience our own tag's counts — open to see them
–Visits
–Page views
–Clicks to vendors
–Time on page
–Reading now
Clicks to vendors, by tool
  • –
Top countries
  • –
Devices
  • –

– · visits, page views and clicks counted by our own tag, which counts more than our checked analytics; every figure rounded down · how we count

Head-to-head · Llm Monitoring

Datadog LLM Observability vs Langfuse

  • 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
Langfuse #3 in Llm Monitoring 8.9/10 Free plan Free plan✓ 2 of 3 features Visit Langfuse

Datadog LLM Observability leads on 0 checks, Langfuse 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 priceLangfuse · $29/mo
  • Free planboth
  • Most featuresDatadog LLM Observability · 3 of 3

Datadog LLM Observability scores higher on our rubric for llm monitoring: 9.1 against 8.9 out of 10; our editors rank them #2 and #3.

Langfuse is cheaper to start at $29/mo against $160/mo. On deployment options, Langfuse gives you Both where Datadog LLM Observability offers Cloud.

Datadog LLM Observability is the better fit for teams already using Datadog. Langfuse is the better fit for teams seeking open-source, full-stack observability.

  • Datadog LLM Observability fits best

    Teams already using Datadog

  • Langfuse fits best

    Teams seeking open-source, full-stack 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 Datadog LLM Observability 9.1/10 Visit ↗ Langfuse 8.9/10 Visit ↗
At a glance
Editor score 9.1 8.9
Ranking #2 in Llm Monitoring #3 in Llm Monitoring
Best for Teams already using Datadog Teams seeking open-source, full-stack observability
Pricing model Free plan + paid Free plan + paid
Starting price $160/mo $29/mo (best)
Free plan ✓ ✓
Free trial — —
Deployment Cloud Cloud, Self-hosted
Platforms Web Web
Support Docs Email, Live chat, Community, Docs
Integrations 10 integrations 100+ integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Datadog LLM Observability 3/3 · Langfuse 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 model calls, agents, tools, and retrieval steps
  • Combines evaluations, prompt management, and cost tracking
  • Offers cloud and self-hosted deployment with 100 integrations
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
  • Hobby plan limits usage to 50k units per month and 2 users
  • Pro costs $199/month for longer data access and added controls
  • Enterprise security and support features require higher-priced plans
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 →

For teams building and operating LLM applications, Langfuse brings tracing, evaluation, prompt management, and cost tracking into one open-source platform. It records structured traces across model calls, agent and tool activity, and…

Read the review →
  1. Datadog LLM ObservabilityLlm Monitoring 9.1Free plan
  2. LangfuseLlm Monitoring 8.9Free plan

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

  • Langfuse — where it wins

    • Traces model calls, agents, tools, and retrieval steps
    • Combines evaluations, prompt management, and cost tracking
    • Offers cloud and self-hosted deployment with 100 integrations

    Where it doesn't

    • Hobby plan limits usage to 50k units per month and 2 users
    • Pro costs $199/month for longer data access and added controls
    • Enterprise security and support features require higher-priced plans
  • 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 →
  • Langfuse8.9/10 · Free plan

    Trace LLMs, agents, retrieval, evaluations, prompts, and costs in cloud or self-hosted deployments.

    Visit LangfuseFull 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