These tools competes with

PromptLayervsLangfuse

Prompt versioning, logging, and A/B testing versus OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)

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Choose PromptLayer when…

  • •You want prompt versioning and request logging
  • •Prompt history, replay, and A/B testing matter
  • •You need visibility into what prompts are running in production

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

PromptLayer

Log every LLM request, version prompts, and run A/B tests. Provides a visual interface for prompt engineering teams to iterate collaboratively.

Website ↗

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 ↗

Only PromptLayer (2)

LangfuseHumanloop

Only Langfuse (31)

Claude CodeCrewAICursorLangGraphLangChainOpenHandsAutoGenLlamaIndexDifyMastra

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