Langfuse is open-source tracing, prompt management, evals, and cost tracking, and you can self-host it for free.
Langfuse lists Hobby as free, with 50,000 units. Core is $29 per month, Pro is $199 per month, and Enterprise is $2,499 per month. Self-hosting is free. Last checked 27 Oct 2026.
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Three other agent frameworks tools listed in this directory.
Agent frameworks
Arize AX does agent tracing and evals with OpenTelemetry, and Phoenix is the open-source local-first product.
Agent frameworks
Braintrust is a tracing and evaluation platform with scorers, human review, and a Loop agent.
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.