freemium observability Engineers
Langfuse
by Langfuse
An open-source LLM observability platform for tracing, evaluation, and prompt management.
5/5
Visit Langfuse Pros
- + Open source and fully self-hostable
- + Tracing, evals, and prompt management in one tool
- + Framework-agnostic with broad integrations
Cons
- − Self-hosting requires setup and maintenance
- − Advanced features gated to paid cloud tiers
- − Dashboard depth has a learning curve
What Is Langfuse
Langfuse is an open-source observability platform for LLM applications. It provides tracing, evaluation, prompt management, and analytics for AI systems.
In Practice
Langfuse is a popular choice for teams that want LLM observability without vendor lock-in — it can be fully self-hosted for data control. It traces agent and chain executions, manages prompt versions, and supports systematic evaluation of model output.