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Head-to-head · AI LLM Evaluation Tools

Langfuse vs Braintrust

  • Updated Oct 2026
  • Both researched from official sources
  • 3 checks side by side
Higher score Langfuse #6 in AI LLM Evaluation Tools 8.9/10 Free plan Free plan✓ 0 of 3 features Visit Langfuse
Braintrust #7 in AI LLM Evaluation Tools 8.8/10 Free plan Free plan✓ 1 of 3 features Visit Braintrust

Langfuse leads on 1 check, Braintrust on 0, and 2 are even. Who comes out ahead on the 3 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreLangfuse · 8.9/10
  • Lowest starting priceLangfuse · $29/mo
  • Free planboth
  • Most featuresBraintrust · 1 of 3

Langfuse scores higher on our rubric for ai llm evaluation tools: 8.9 against 8.8 out of 10; our editors rank them #6 and #7.

Langfuse is cheaper to start at $29/mo against $249/mo.

Langfuse is the better fit for open-source teams needing full evaluation observability. Braintrust is the better fit for organizations needing governed evaluation workflows.

  • Langfuse fits best

    Open-source teams needing full evaluation observability

  • Braintrust fits best

    Organizations needing governed evaluation workflows

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Side by side

Feature Langfuse 8.9/10 Visit ↗ Braintrust 8.8/10 Visit ↗
At a glance
Editor score 8.9 8.8
Ranking #6 in AI LLM Evaluation Tools #7 in AI LLM Evaluation Tools
Best for Open-source teams needing full evaluation observability Organizations needing governed evaluation workflows
Pricing model Free plan + paid Free plan + paid
Starting price $29/mo (best) $249/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Email, Live chat, Community, Docs Community, Docs
Compliance SOC 2, ISO 27001, GDPR, HIPAA SOC 2, GDPR, HIPAA, SSO/SAML, 2FA
Integrations 100+ integrations 50+ integrations
Built for Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Langfuse 0/3 · Braintrust 1/3
Safety evaluations Not checked yet Not checked yet
Prompt versioning Not checked yet ✓ (best)
API access Not checked yet Not checked yet
Specs
Evaluation methods Not checked yet Not checked yet
Model support Not checked yet Not checked yet
Deployment Not checked yet Not checked yet
Our review
Pros
  • Traces LLM calls, agents, tools, and retrieval steps
  • Combines evaluations, prompts, datasets, experiments, and annotations
  • Offers managed cloud, API access, and self-hosted deployment
  • Offline, online, human, custom, and LLM-as-a-judge evaluations
  • Production tracing, prompt rollback, and CI/CD regression gates
  • Hosted or self-hosted deployment with RBAC on paid plans
Cons
  • Hobby limits access to 50k units monthly and 30 days of data
  • Advanced governance features require paid add-ons or enterprise plans
  • Enterprise pricing starts at $2,499 monthly before custom options
  • Pro starts at $249 per month before usage-based charges
  • Starter retention is limited to 14 days
  • Enterprise pricing and some deployment options require a custom plan
Our verdict

Langfuse is an open-source platform for teams building and operating LLM applications, AI agents, and workflow automation. It combines hierarchical application tracing with prompt versioning, evaluations, datasets, experiments, human…

Read the review →

Braintrust is an evaluation and observability platform for teams building AI applications and agents. It supports dataset and experiment management, offline and online evaluations, production tracing, prompt versioning, human review,…

Read the review →
  1. LangfuseAI LLM Evaluation Tools 8.9Free plan
  2. BraintrustAI LLM Evaluation Tools 8.8Free plan

Strengths and trade-offs

  • Langfuse — where it wins

    • Traces LLM calls, agents, tools, and retrieval steps
    • Combines evaluations, prompts, datasets, experiments, and annotations
    • Offers managed cloud, API access, and self-hosted deployment

    Where it doesn't

    • Hobby limits access to 50k units monthly and 30 days of data
    • Advanced governance features require paid add-ons or enterprise plans
    • Enterprise pricing starts at $2,499 monthly before custom options

  • Braintrust — where it wins

    • Offline, online, human, custom, and LLM-as-a-judge evaluations
    • Production tracing, prompt rollback, and CI/CD regression gates
    • Hosted or self-hosted deployment with RBAC on paid plans

    Where it doesn't

    • Pro starts at $249 per month before usage-based charges
    • Starter retention is limited to 14 days
    • Enterprise pricing and some deployment options require a custom plan

More comparisons

All AI LLM evaluation tools comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update