Arize Phoenix vs LlamaIndex
Side-by-side comparison with live GitHub signals. Last updated April 1, 2026.
| Metric | Arize Phoenix | LlamaIndex |
|---|---|---|
| GitHub Stars | 8.5K | 48.2K |
| Contributors | 120 | 474 |
| Last Commit | Mar 28, 2026 | Mar 31, 2026 |
| Open Issues | — | 262 |
| License | open-source | open-source |
| Pricing | freemium | open-source |
| Free Tier | Yes | Yes |
| Category | dev-tools | dev-tools |
| Trending | Yes | No |
Shared Tags
open-source
Only in Arize Phoenix
observabilitytracingevaluationopentelemetrydebugging
Only in LlamaIndex
ragdata-frameworkagentsworkflowspython
About Arize Phoenix
Arize Phoenix is an open-source observability platform for LLM applications. It provides tracing for multi-step agent workflows, built-in evaluation with LLM-as-judge and code-based evals, dataset management for experiments, and a visual UI for debugging prompt/response pairs. Phoenix integrates with OpenTelemetry, LangChain, LlamaIndex, and OpenAI, and can run locally or in the cloud.
View full listingAbout LlamaIndex
LlamaIndex is the leading data framework for building LLM-powered applications. Provides data connectors for 160+ sources, advanced RAG pipelines, document agents, and a workflow engine for complex agentic applications. The standard for connecting LLMs to your data.
View full listing