Langfuse alternatives

The short answer

6 tools on this index are recorded as a substitute for Langfuse. 3 of these run the same way you already deploy Langfuse (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 Langfuse 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.

• Braintrustplatform · proprietary

  Evaluation platform with built-in scorers and a data flywheel.

  Use when Making evaluation, rather than tracing, the primary workflow.

  Skip when You need open formats and self-hosting.

• Arize Phoenixlibrary · Apache-2.0

  Open-source tracing and evaluation built on OpenTelemetry.

  Use when OpenTelemetry-native evaluation you can run yourself.

  Skip when You want a vendor support contract behind it.

• Heliconeplatform · proprietary

  Gateway-level observability with per-request cost and latency.

  Use when Gateway-level observability with per-request cost and latency.

  Skip when You need eval primitives more than traffic logs.

• 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.