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Langfuse

langfuse.com

Open-source LLM observability with tracing, evaluation, and prompt management

Active · verified June 2026

Categories Langfuse serves

The B4 Index places Langfuse in 2 categories. Each category page lays out the build-versus-buy considerations for that decision.

Prompt Management & Engineering Platform Free tier; from $20/mo; enterprise from $2,499/yr
LLM Observability & Agent Tracing Platform Open-source (self-hosted free). Cloud from $29/month.

Langfuse compared

Langfuse vs LangSmith Langfuse vs Braintrust
The B4 Index scores every software category on two axes, strategic differentiation and AI feasibility, to classify it Build, Buy, Bridge, or Beware. Vendor facts here are independent of that call. See the full methodology.