Arize Phoenix alternatives

The short answer

4 tools on this index are recorded as a substitute for Arize Phoenix. 3 of these run the same way you already deploy Arize Phoenix (self-hosted), and 3 are permissively licensed, so they do not change what you can ship. All of them sit in Evaluation & Observability, so the choice is a real one rather than a category change. There is no overall winner here: which one is right depends on traffic shape, operational budget and how much of Arize Phoenix you have already built around.

By Lattice editorial · Comparison reviewed 2026-09 · method

• LangSmithplatform · proprietary

  Tracing, evaluation and dataset tooling across LangChain runs.

  Use when Teams already deep in LangChain needing tracing and datasets.

  Skip when Traces cannot leave your infrastructure.

• Langfuseplatform · MIT

  Self-hostable LLM tracing, prompt management and cost analytics.

  Use when Self-hostable tracing, prompts and evals in one place.

  Skip when You want a fully managed product with a support contract.

• Gentraceplatform · Apache-2.0

  Open-source tracing and dashboards for LLM applications.

  Use when Open-source tracing and dashboards for LLM applications.

  Skip when You want eval depth more than traffic visibility.

• Opikplatform · Apache-2.0

  Open-source LLM observability and evaluation from Comet.

  Use when Open-source observability and evaluation you run yourself.

  Skip when You need enterprise support behind it.