✓ Use when
Every team running LLM applications in production. Langfuse makes debugging, cost tracking, and quality evaluation possible.
✗ Avoid when
Simple prototyping — adds overhead before you have traffic worth monitoring.
What is Langfuse?
Langfuse provides observability, evaluation, and prompt management for LLM applications. Trace every LLM call, score outputs, run evals, and manage prompt versions. Self-hostable and open-source, making it the privacy-first observability choice for companies that cannot send data to third parties.
Key features
✓Full LLM call tracing with latency and cost
✓Custom evaluation scoring (human + automated)
✓Prompt versioning and A/B testing
✓Dataset management for evals
✓Self-hostable for data sovereignty
Integrations
LangChainLlamaIndexOpenAIAnthropic
Third-party ratings
GitHub
4.7· 3,200 reviews
💰 Real-world pricing
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