1.langfuse / langfuse🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.analyticsllmllmopslarge-language-modelsopenaiself-hosted+13 moreTypeScriptOther license37K total4.2K forks+4,552 starsfrom 32,515 · score 8.42
2.Arize-ai / phoenixAI Observability & Evaluationllmopsai-monitoringai-observabilityllm-evalaiengineeringdatasets+10 morePythonOther license12K total1.3K forks+1,286 starsfrom 10,879 · score 7.16