Arize AI

Arize AI provides observability and evaluation tools for both LLM and traditional ML applications. For LLM apps, it offers tracing, prompt engineering tools, built-in evaluators, and integrations with frameworks like LangGraph, LlamaIndex, CrewAI, and DSPy. For ML models, it monitors drift, bias, data quality, and performance degradation across environments. Arize also maintains Phoenix, an open-source AI observability library. The platform includes a free tier with 25,000 trace spans per month.