Phoenix
Free tierThe open-source platform for AI agent development, tracing, and evaluation
Free tier available·Technical·Powered by Vendor Agnostic·API available·Open source
Key strengths
Open-source LLM observability and agent tracingLLM-as-judge and human annotation evaluationNative OpenTelemetry support with no vendor lock-inSelf-hostable / local deploymentVendor and model agnosticExperiment and dataset management for iterative improvement
Free tier + paid plans · from $50 USD/mo
US
Self-hostable
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Recent changes
- Starting price: $0/mo → $50/mo
- Plans updated: AX Free (free, 25k spans/mo, 1 GB, 15-day retention, SaaS); AX Pro ($50/mo, 50k spans/mo, 10 GB, 30-day retention, SaaS); AX Enterprise (custom, SaaS or Self-Hosted)
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Documentation & Integration — Developer Notes
Arize Phoenix is instrumented via OpenTelemetry, so any OTel-compatible SDK can emit traces to Phoenix with minimal configuration. No proprietary agents or sidecars are required.
Integration ecosystem:
- LlamaIndex — first-class tracing support for RAG pipelines and agent workflows built with LlamaIndex.
- NVIDIA NeMo Agent Toolkit — observability for NeMo-based agent systems.
- Docker & Kubernetes — official support for containerized self-hosted deployments.
- Slack — alerting and notification integration.
- OpenTelemetry — core instrumentation standard; bring your own OTel SDK.
Deployment options:
- Local — run Phoenix as a lightweight local server during development.
- Self-hosted — deploy via Docker or Kubernetes for full data control.
- SaaS (managed) — AX Free, AX Pro, and AX Enterprise tiers available; Enterprise supports both SaaS and self-hosted.
Evaluation capabilities:
- LLM-as-judge pipelines for automated trace and response scoring.
- Human annotation interfaces for labeling and quality review.
- Dataset versioning and experiment tracking for iterative prompt/model development.
Refer to the official Arize Phoenix GitHub repository and Arize documentation portal for SDK references, quickstart guides, and self-hosting configuration details.
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