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Head-to-head · AI LLM Evaluation Tools

Promptfoo vs Langfuse

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score Promptfoo #3 in AI LLM Evaluation Tools 9.2/10 Free plan Free plan✓ 0 of 3 features Visit Promptfoo
Langfuse #6 in AI LLM Evaluation Tools 8.9/10 Free plan Free plan✓ 0 of 3 features Visit Langfuse

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

Our verdict

  • Highest scorePromptfoo · 9.2/10
  • Free planboth

Promptfoo scores higher on our rubric for ai llm evaluation tools: 9.2 against 8.9 out of 10; our editors rank them #3 and #6.

Promptfoo is the better fit for teams prioritizing testing and red teaming. Langfuse is the better fit for open-source teams needing full evaluation observability.

  • Promptfoo fits best

    Teams prioritizing testing and red teaming

  • Langfuse fits best

    Open-source teams needing full evaluation observability

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Side by side

Feature Promptfoo 9.2/10 Visit ↗ Langfuse 8.9/10 Visit ↗
At a glance
Editor score 9.2 8.9
Ranking #3 in AI LLM Evaluation Tools #6 in AI LLM Evaluation Tools
Best for Teams prioritizing testing and red teaming Open-source teams needing full evaluation observability
Pricing model Free plan + paid Free plan + paid
Starting price — $29/mo
Free plan ✓ ✓
Free trial — —
Deployment Cloud, Self-hosted Cloud, Self-hosted
Platforms Web Web
Support Community, Docs Email, Live chat, Community, Docs
Compliance SOC 2, ISO 27001 SOC 2, ISO 27001, GDPR, HIPAA
Integrations 12 integrations 100+ integrations
Built for Solo, Small business, Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Promptfoo 0/3 · Langfuse 0/3
Safety evaluations Not checked yet Not checked yet
Prompt versioning Not checked yet Not checked yet
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
  • Evaluates prompts, models, RAG pipelines, safety, and vulnerabilities
  • Supports custom metrics, human review, and LLM-as-a-judge grading
  • Connects with major providers, CI tools, observability, and MCP
  • Traces LLM calls, agents, tools, and retrieval steps
  • Combines evaluations, prompts, datasets, experiments, and annotations
  • Offers managed cloud, API access, and self-hosted deployment
Cons
  • Enterprise and On-Premise plans use custom pricing
  • Team collaboration and continuous monitoring require Enterprise
  • Dedicated deployment engineering is limited to On-Premise
  • 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
Our verdict

Promptfoo is an open-source CLI and library for evaluating, testing, and red-teaming large-language-model applications. It is designed for teams benchmarking prompts, models, and RAG pipelines, as well as developers checking AI quality,…

Read the review →

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 →
  1. PromptfooAI LLM Evaluation Tools 9.2Free plan
  2. LangfuseAI LLM Evaluation Tools 8.9Free plan

Strengths and trade-offs

  • Promptfoo — where it wins

    • Evaluates prompts, models, RAG pipelines, safety, and vulnerabilities
    • Supports custom metrics, human review, and LLM-as-a-judge grading
    • Connects with major providers, CI tools, observability, and MCP

    Where it doesn't

    • Enterprise and On-Premise plans use custom pricing
    • Team collaboration and continuous monitoring require Enterprise
    • Dedicated deployment engineering is limited to On-Premise

  • 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

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