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Langfuse

Open-source observability and analytics for LLM apps

FreemiumFree TierAdded Jun 1, 2023

About

Langfuse is an open-source platform for monitoring, debugging, and improving LLM-powered applications. It provides tracing for every LLM call, prompt management with versioning, evaluation frameworks, cost tracking across providers, and user feedback collection. Langfuse integrates with LangChain, LlamaIndex, OpenAI SDK, and other popular AI frameworks. It's become essential infrastructure for teams running AI in production who need visibility into model behavior and costs.

Tags

llm-observabilityai-monitoringopen-sourceprompt-managementtracing

Origin Story

By Marc Klingen

The Problem

LLM applications are black boxes in production — you can't see what prompts are sent, what they cost, or why outputs are bad.

Building It

Launched 2023, quickly became the leading open-source LLM observability tool. YC-backed.

What It Means

Shows that AI applications need their own observability layer, distinct from traditional APM tools.

The Dream

Be the Datadog for AI — the standard monitoring layer for every LLM application in production.

Pricing

ModelFreemium
Starting at$59/mo
Free tierAvailable

Self-hosted is free and unlimited. Cloud free tier with 50K observations/mo. Pro at $59/mo. Team at $199/mo. Enterprise custom.

View pricing

Category

Developer Tools

Problems Solved

  • Debugging Llm Applications
  • Tracking Ai Costs Across Providers
  • Evaluating Llm Output Quality

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