A side-by-side of two observability for building AI agents — live GitHub data, languages, and what each is best at.
| Langfuse | Phoenix | |
|---|---|---|
| GitHub stars | ★ 29k | ★ 10k |
| Language | TypeScript | Jupyter Notebook |
| Category | Observability | Observability |
| Best for | LLM tracing | OTel tracing |
| Repository | langfuse/langfuse | Arize-ai/phoenix |
Langfuse and Phoenix are both credible choices. By community traction, Langfuse leads (★ 29k). Pick Langfuse for LLM tracing; pick Phoenix for OTel tracing.
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