These tools integrates with

PromptFoovsLangfuse

CLI/library for prompt testing and red-teaming versus OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)

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Choose PromptFoo when…

  • •You want CLI-first, config-driven LLM evals
  • •Running eval suites in CI/CD pipelines is a goal
  • •You need red-teaming and safety testing built in

Choose Langfuse when…

  • •You want open-source LLM observability
  • •Self-hosting your tracing stack is important
  • •You need cost tracking across models and users

Side-by-side comparison

Field
PromptFoo
Langfuse
Category
Prompt & Eval
Observability
Type
Open Source
Open Source
Free Tier
✓ Yes
✓ Yes
Pricing Plans
—
Cloud: $59/mo
GitHub Stars
⭐ 5,000
⭐ 7,000
Health
●95 — Active
●95 — Active

PromptFoo

Test and compare prompts across models. Built-in red-teaming, regression testing, and side-by-side model comparison.

Website ↗GitHub ↗

Langfuse

Open-source platform for tracing, evaluations, and prompt management. Self-hostable alternative to LangSmith with broad framework support. Acquired by ClickHouse in January 2026; OSS core continues with deeper ClickHouse-backed analytics.

Website ↗GitHub ↗

Shared Connections3 tools both integrate with

DeepEvalOpenAI APIAgenta

Only PromptFoo (3)

LangfuseVellumGalileo

Only Langfuse (28)

Claude CodeCrewAICursorLangGraphLangChainOpenHandsAutoGenLlamaIndexDifyMastra

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See how PromptFoo and Langfuse fit into the bigger picture — 235 tools, 543 relationships, all mapped.

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