Langfuse

Open-source LLM observability platform for tracing, evals, and debugging.

Overview

Langfuse offers comprehensive observability for LLM apps, including tracing, metrics, and evals with an open-source core. Its generous cloud tier and self-hostable nature make it the choice for hackathon teams that want production-grade monitoring without vendor lock-in.

Best for

• Tracking LLM costs and latency during demos
• Debugging agent traces and prompt performance
• Teams wanting open-source observability with cloud option

Trade-offs

What XeroHack pre-wires

When you pick Langfuse in the interview, the engine emits these files into your scaffold:

• Langfuse SDK middleware
• Environment variables (LANGFUSE_PUBLIC_KEY)
• Trace config for prompts and generations