LangSmith
By LangChain. Deep LangChain integration. Traces, prompt registry, evals. SaaS or self-hosted.
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Arize Phoenix
Open-source + SaaS. Broader ML + LLM. Drift detection strong. Embedding visualization.
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Datadog LLM Obs
Extended APM for LLM. Integrates with existing Datadog. Enterprise-friendly.
Helicone
Open-source + SaaS. Proxy-based. Simple integration. Cost focus.