Arize AX does agent tracing and evals with OpenTelemetry, and Phoenix is the open-source local-first product.
Arize lists AX Free and AX Pro at $50 per month. Enterprise pricing is custom. Phoenix is open source. Last checked 27 Oct 2026.
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Three other agent frameworks tools listed in this directory.
Agent frameworks
Braintrust is a tracing and evaluation platform with scorers, human review, and a Loop agent.
Agent frameworks
Langfuse is open-source tracing, prompt management, evals, and cost tracking, and you can self-host it for free.
Agent frameworks
Cursor Agent SDK lets you define an agent as code: an instructions.md prompt, typed TypeScript tools, skills, MCP connections, and channels. You test that agent with evals, then deploy it on Cursor's hosting or run it on your own infrastructure.