# Langfuse

Product · https://godooo.ai/en/product/langfuse

> Langfuse is an open-source AI app, launched in 2023, made for developers and businesses.

An open-source platform for tracing, evaluating and monitoring LLM apps and agents.

Main jobs: Evaluate and trace LLM apps. It is open source and free to use. You can use it in the browser, on your own server and through an API.

## At a glance

- **Type:** [Product](https://godooo.ai/en/browse#product)
- **Launched:** 2023
- **Galaxy:** [Models & APIs](https://godooo.ai/en/galaxy/builders)
- **Pricing:** Open source, free
- **Open source:** Yes
- **Source code:** [github.com/langfuse/langfuse](https://github.com/langfuse/langfuse)
- **GitHub stars:** 35,004
- **How you run it:** Web · Self-host · API
- **Made for:** Developers · Businesses
- **Website:** [langfuse.com](https://langfuse.com)

## What it can do

- **[Evaluate and trace LLM apps](https://godooo.ai/en/capability/llm-evaluation)** — main job, _proposed by a machine, awaiting calibration_. “Trace, evaluate, and improve AI agents with one open platform.” (read on [langfuse.com](https://langfuse.com/), 2026-09-24)
- **[Prompt optimization](https://godooo.ai/en/capability/prompt-engineering)** — supported, _proposed by a machine, awaiting calibration_. “Prompt Management helps you centrally manage, version control, and collaboratively iterate on your prompts.” (read on [github.com](https://github.com/langfuse/langfuse), 2026-09-24)

## Alternatives

- **[Phoenix](https://godooo.ai/en/framework/phoenix)** (Open source, free): Also does: Evaluate and trace LLM apps, Prompt optimization; runs offline
- **[DeepEval](https://godooo.ai/en/framework/deepeval)** (Open source, free): Also does: Evaluate and trace LLM apps
- **[promptfoo](https://godooo.ai/en/cli/promptfoo)** (Open source, free): Also does: Evaluate and trace LLM apps; runs offline
- **[Ragas](https://godooo.ai/en/framework/ragas)** (Open source, free): Also does: Evaluate and trace LLM apps; runs offline
- **[Pydantic AI](https://godooo.ai/en/framework/pydantic-ai)** (Open source, free): Also does: Evaluate and trace LLM apps; runs offline

## Connections

- **Integrates with:** [LangChain](https://godooo.ai/en/framework/langchain), [LlamaIndex](https://godooo.ai/en/framework/llamaindex)

## Questions

### What is Langfuse?

Langfuse is an open-source AI app, launched in 2023, made for developers and businesses. An open-source platform for tracing, evaluating and monitoring LLM apps and agents.

### Is Langfuse free?

Yes. Langfuse is open source and free to use.

### Is Langfuse open source?

Yes. The source code is at https://github.com/langfuse/langfuse.

### Can Langfuse run locally?

Langfuse can be self-hosted on your own server.

### What can Langfuse do?

Main jobs: Evaluate and trace LLM apps. It can also do: Prompt optimization.

### What are open-source alternatives to Langfuse?

Open-source ones: Phoenix, DeepEval, promptfoo, Ragas and Pydantic AI.

## Sources

- [langfuse.com](https://langfuse.com/) — checked 2026-09-24
- [github.com](https://github.com/langfuse/langfuse) — checked 2026-09-24

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Last updated 2026-09-24 · sources checked 2026-09-24 · Markdown version of https://godooo.ai/en/product/langfuse. Every page on this site has one: add .md to its address.