These tools competes with

Arize PhoenixvsLangWatch

ML/LLM observability and evaluation platform versus LLM observability and evaluation with OpenTelemetry support

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Choose Arize Phoenix when…

  • •You need ML observability beyond just LLMs
  • •RAG pipeline tracing and eval integration is required
  • •You're running experiments and need a notebook-friendly tool

Choose LangWatch when…

  • •You want OpenTelemetry-native LLM tracing without vendor lock-in
  • •You need combined tracing and automated evaluation in one platform
  • •You prefer self-hosting your observability stack

Side-by-side comparison

Field
Arize Phoenix
LangWatch
Category
Observability
Observability
Type
Open Source
Open Source
Free Tier
✓ Yes
✓ Yes
Pricing Plans
Enterprise: Custom
Cloud: $99/mo
GitHub Stars
⭐ 4,000
⭐ 2,000
Health
●90 — Active
●70 — Active

Arize Phoenix

Open-source observability platform for ML and LLM applications. Supports tracing, evaluation, and dataset management with a strong eval framework.

Website ↗GitHub ↗

LangWatch

Open-source LLM observability and evaluation platform with OpenTelemetry-native tracing. Provides trace visualization, automated LLM-as-judge evaluations, dataset management, and prompt versioning. Self-hostable with a managed cloud option.

Website ↗GitHub ↗

Shared Connections1 tools both integrate with

Langfuse

Only Arize Phoenix (2)

HeliconeLangWatch

Only LangWatch (2)

Arize PhoenixLangChain

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