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Langfuse
44
Stack Score
Editorial pick✓ Verified working
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Langfuse

Open-source LLM observability + evals.

Try Langfuse✓ Free trial available

Best for

Best for AI engineering teams wanting OSS LLM observability.

At a glance

Pricing
freemium
Setup time
20 minutes
Learning curve
moderate
Last verified
5/26/2026

What we love

  • ✓Truly OSS self-host option
  • ✓Active product investment
  • ✓Strong dev UX

Where it falls short

  • −Newer than LangSmith
  • −Less polished evals UX
  • −Smaller community

Pricing

✓ Pricing verified Jun 21, 2026

3 tiers

OSS

$0

perpetual

  • ✓Self-host

Cloud Hobby

$0

per month

  • ✓50K obs/month

Cloud Pro

Custom

per user

  • ✓Premium features

Overview

Langfuse is an OSS LLM observability platform — traces, evals, prompt management, datasets. Self-host or cloud. Strong alternative to LangSmith.

Key features

  • ●LLM tracing
  • ●Prompt management
  • ●Evals + datasets
  • ●OSS self-host
  • ●Cloud option

Best use cases

OSS LLM observability

Run LLM observability on owned infra without per-trace fees.

Multi-team prompt management

Manage prompts across teams with versioning + evals.

Integrations

Python
JS
LangChain
LlamaIndex
OpenAI
Anthropic

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