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Arize Phoenix
Open-source, OpenTelemetry-based tracing and evaluation library that runs locally or self-hosted, serving as the OSS on-ramp to Arize's enterprise platform.
| Category | Observability & Tracing |
| OpenTelemetry-native | Yes — no proprietary-SDK lock-in |
| Open source | Yes |
| Self-hostable | Yes |
| Pricing model | free |
| Pricing notes | Fully free OSS (Elastic License v2); hosted Phoenix Cloud has a free tier |
| Framework integrations | openai-sdk, langchain, llamaindex, dspy, opentelemetry, smolagents |
| Funding / ownership | Backed by Arize AI ($70M Series C, Feb 2025) |
| GitHub stars | 10,119 |
| Maintenance | active (commit 2026-06-13) |
| License (GitHub) | not detected |
| Open issues | 585 |
| Maturity signal | 90/100 (Mature) — computed from public GitHub signals, see methodology |
Pricing/feature source: https://phoenix.arize.com
Maturity signal is computed from public GitHub data only. How it is calculated.
Frequently asked questions
Is Arize Phoenix open source?
Yes.
Can I self-host Arize Phoenix?
Yes — Arize Phoenix can run in your own infrastructure.
Is Arize Phoenix OpenTelemetry-native?
Yes — Arize Phoenix speaks OpenTelemetry (OTLP) natively, so there is no proprietary-SDK lock-in.
How much does Arize Phoenix cost?
Free. Fully free OSS (Elastic License v2); hosted Phoenix Cloud has a free tier