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Langfuse

Langfuse traces, evaluates, and monitors AI agents and LLM applications, with prompt management, experiments, and cost analytics.

Langfuse

Langfuse is an open-source platform for tracing LLM calls, tool use, retrieval steps, and agent workflows. Teams use it to inspect production behavior, manage prompts, run evaluations, compare experiments, and track quality, cost, and latency.

It is available as Langfuse Cloud or self-hosted software. Cloud pricing includes a free Hobby plan, while usage beyond included units and some enterprise capabilities cost extra. Some features depend on external LLM APIs.

Features

  • Capture hierarchical traces for LLM calls, tools, retrieval, sessions, and agents
  • Manage, version, cache, compose, and deploy prompts separately from application code
  • Run LLM-as-a-Judge, code, human, and custom evaluations
  • Create datasets and compare prompt, model, and code changes with experiments
  • Monitor cost, latency, volume, quality, and scores in dashboards
  • Use public APIs, SDKs, CLI, and MCP Server to query and manage data
  • Self-host with Docker, Kubernetes, AWS, Azure, or GCP
  • Open-source software under the MIT license

Use cases

  • Debug multi-step AI agent traces in production
  • Evaluate chatbot quality with live traces and test datasets
  • Compare prompt or model changes before deployment
  • Track LLM costs and latency by user, session, feature, or model
  • Review outputs manually and build labeled evaluation datasets
  • Export trace and evaluation data to external systems

Pros

    Cons

      Pricing

      Starting price
      Free
      Pricing checked
      2026-09-19

      Hobby

      Free

      • 50k units / month included
      • 30 days data access
      • 2 users
      • Community support via GitHub

      Core

      $29/ month

      • 100k units / month included
      • Additional usage: $8/100k units
      • 90 days data access
      • Unlimited users
      • In-app support

      Pro

      $199/ month

      • 100k units / month included
      • Additional usage: $8/100k units
      • 3 years data access
      • Data retention management
      • SOC2 & ISO27001 reports
      • HIPAA-ready region

      Enterprise

      $2499/ month

      • 100k units / month included
      • Additional usage: $8/100k units
      • Audit Logs
      • SCIM API
      • Custom rate limits
      • Uptime SLA and Support SLA
      Official website