Langfuse

Open-source LLM tracing and evals. Langfuse competes in the AI Model Training category, where our editors have reviewed 294 tools so far. It has been bookmarked by 5,800 readers, making it one of the most trusted options in its class. This in-depth review breaks down exactly where Langfuse shines, where it falls short, and who should choose it.

In real-world use, Langfuse's clearest strengths are LLM tracing and scores; Prompt management; Open-source core. These advantages matter most for Tracing prompts, Collecting feedback, Running evals, Managing versions — the exact workload Langfuse was designed around. Readers who prioritise these qualities consistently rank it among their favourites in AI Model Training.

No tool is perfect — before you commit, weigh Self-hosting needs setup; Advanced analytics need paid tier. Langfuse pricing starts at Free. Always confirm the latest plans on the official website, because prices change often. Because you can evaluate the full experience free of charge, Langfuse is a low-risk tool to try this week. Langfuse is a solid, well-reviewed choice in AI Model Training and deserves a place on your shortlist.