Langfuse
OPEN SOURCEOpen-source LLM observability — tracing, evals, prompt management, and cost analytics.
Free self-host / $49/mo cloud Free tier available
About
Langfuse is an open-source LLM engineering platform offering detailed tracing, evaluations, prompt versioning, and dataset management. Integrates with LangChain, LlamaIndex, OpenAI SDK, and more. Self-host or use Langfuse Cloud.
Features
Detailed LLM tracing
Prompt versioning & management
Evaluation pipelines
Dataset management
Cost & latency analytics
Self-hostable
Specifications
| Trigger Types | SDK / programmatic |
| No-Code | |
| Self-Host | |
| Open Source | |
| LLM Native | |
| Starting Price | Free (self-host) |