DeepYard

Langfuse vs promptfoo

Side-by-side comparison built from DeepYard's structured catalog. Content updated Aug 21, 2026.

Direct Answer

Langfuse suits teams needing freemium free tier, observability focus, and 33,539 GitHub stars in current listing data. promptfoo suits teams needing open-source access, testing focus, and 24,450 GitHub stars in current listing data. This summary reflects catalog metadata only for decision support, not independent testing.

What this comparison weighs

  • Pricing and free-tier availability
  • License model and deployment fit
  • GitHub adoption and contributor depth
  • Catalog tags, integrations, and supported workflows
L

Langfuse

Open-source LLM engineering platform — traces, evals, prompt management — 23K+ stars

OSSfreemium
33.5Ktoday196
Visit GitHub
p

promptfoo

Test and evaluate LLM prompts and agents — 11K+ stars

OSSFree
24.4Ktoday318
Visit GitHub
MetricLangfusepromptfoo
GitHub Stars33.5K24.4K
Contributors196318
Last CommitAug 22, 2026Aug 21, 2026
Open Issues811515
Licenseopen-sourceopen-source
Pricingfreemiumopen-source
Free TierYesYes
Categorydev-toolsdev-tools
TrendingNoNo

Choose Langfuse if you need

  • • Langfuse stands out for Observability workflows that are not listed for promptfoo.
  • • Langfuse is the stronger pick when Langchain matters because that capability is listed only on its profile.
  • • Langfuse shows broader GitHub adoption with 33,539 stars versus 24,450 for promptfoo.

Choose promptfoo if you need

  • • promptfoo stands out for Testing workflows that are not listed for Langfuse.
  • • promptfoo is the stronger pick when Gemini matters because that capability is listed only on its profile.
  • • promptfoo has a larger visible contributor base (318 vs 196).

Meaningful differences

  • • Pricing model: Langfuse is listed as freemium, while promptfoo is listed as open-source.
  • • Workflow emphasis: Langfuse highlights Observability, while promptfoo highlights Testing.
  • • GitHub adoption: Langfuse shows 33,539 stars versus 24,450 for promptfoo.
  • • Contributor count: Langfuse lists 196 contributors and promptfoo lists 318.

Shared capabilities

  • • Evaluation
  • • Open Source
  • • Openai
  • • Anthropic

Shared Tags

evaluationopen-source

Only in Langfuse

observabilitytracingprompt-managementanalytics

Only in promptfoo

testingred-teamingsecurityci-cd

Limitations and evidence

  • • DeepYard compares structured public metadata; this is not an independent benchmark unless a test record is shown.
  • • Signals such as stars, contributors, and last commit indicate public activity, not purchase fit or runtime quality.
  • • Pricing and feature coverage reflect the stored listing snapshot and may lag vendor changes between refreshes.

Source links

Manifest content date: 2026-08-21

About Langfuse

Langfuse is an open-source LLM engineering platform providing observability, analytics, and prompt management. Features distributed tracing for complex agent chains, evaluation scoring, prompt versioning and A/B testing, dataset management, and cost tracking. Integrates with LangChain, LlamaIndex, OpenAI SDK, and any LLM framework via OpenTelemetry.

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About promptfoo

promptfoo is an open-source tool for testing, evaluating, and red-teaming LLM applications. Run automated evaluations across multiple models and prompts, compare outputs side-by-side, detect regressions, and test for security vulnerabilities. Supports custom assertions, CI/CD integration, and model-graded evaluations.

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