Open-source LLM/agent observability (Phoenix) plus Arize AX, the commercial platform for production monitoring and online evals.
Pricing: Phoenix OSS is free/self-hostable; Arize hosts a free Phoenix cloud tier; Arize AX (production monitoring, online evals, Alyx assistant) is paid/enterprise.
Instant self-serve — free signup gives a key immediately (a human unblocks an agent in under 2 minutes).
Phoenix OSS needs NO signup and NO API key for local/self-hosted tracing (pip install arize-phoenix). Phoenix Cloud (app.phoenix.arize.com) uses a free instant API key after signup.
Arize Phoenix / AX — Open-source LLM/agent observability (Phoenix) plus Arize AX, the commercial platform for production monitoring and online evals.
Website: https://arize.com/phoenix/
Docs: https://arize.com/docs/phoenix
Get a key: https://app.phoenix.arize.com
Agent signup: self serve instant key — Phoenix OSS needs NO signup and NO API key for local/self-hosted tracing (pip install arize-phoenix). Phoenix Cloud (app.phoenix.arize.com) uses a free instant API key after signup.
Auth: api-key
MCP server: @arizeai/phoenix-mcp
Pricing: freemium — Phoenix OSS is free/self-hostable; Arize hosts a free Phoenix cloud tier; Arize AX (production monitoring, online evals, Alyx assistant) is paid/enterprise.
Full record: https://dreaming.press/api/tools/arize-phoenix.jsonMachine record: /api/tools/arize-phoenix.json · add its MCP server →
# pip install arize-phoenix openinference-instrumentation-openai
from phoenix.otel import register
# auto-instruments OpenAI, LangChain, LlamaIndex, etc.
tracer_provider = register(
project_name="my-app",
auto_instrument=True,
)
# For Phoenix Cloud, also set PHOENIX_API_KEY + PHOENIX_COLLECTOR_ENDPOINTpython · full docs →
Arize Phoenix / AX exposes an MCP server, so you can add its tools to Claude, Cursor, or any MCP client: @arizeai/phoenix-mcp
Arize Phoenix / AX is Open-source LLM/agent observability (Phoenix) plus Arize AX, the commercial platform for production monitoring and online evals. It's in the Observability & evals (managed) category of the dreaming.press tool directory.
Arize Phoenix / AX is freemium — free to start, paid plans for scale. Phoenix OSS is free/self-hostable; Arize hosts a free Phoenix cloud tier; Arize AX (production monitoring, online evals, Alyx assistant) is paid/enterprise..
Almost — signup is instant and self-serve (a free key with no sales call), so a human can unblock an agent in under two minutes. Phoenix OSS needs NO signup and NO API key for local/self-hosted tracing (pip install arize-phoenix). Phoenix Cloud (app.phoenix.arize.com) uses a free instant API key after signup..
Yes — Arize Phoenix / AX offers a Model Context Protocol server, so you can add its tools to Claude, Cursor, or any MCP client: @arizeai/phoenix-mcp
Arize Phoenix / AX is a hosted API service, not an open-source project.
Arize Phoenix / AX offers Python, TypeScript, OpenTelemetry, REST.
We track the AI stack so you don't have to — pricing, MCP support, and which tools an agent can sign up for. Free.