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Observability

Tracing, logging and monitoring for LLM apps and agents in production, so you can see what happened, what it cost and where quality slipped.

Langfuselangfuse.comOpen-source LLM engineering platform for traces, evaluations, prompt management and cost tracking, self-hostable.ObservabilityOpen source★ 35.4kLaminarlaminar.shOpen-source observability platform for AI agents with tracing, evaluations and browser-session replays.ObservabilityOpen source★ 3.3kOpikcomet.comComet's open-source platform for logging, evaluating and monitoring LLM apps, RAG systems and agents.ObservabilityOpen source★ 22.4kArize Phoenixarize.comOpen-source observability and evaluation tool built on OpenTelemetry, running locally or in the cloud.ObservabilityOpen source★ 11.7kOpenLLMetrytraceloop.comOpenTelemetry-based instrumentation for LLM providers and frameworks, sending traces to any observability backend.ObservabilityOpen source★ 7.5kHeliconehelicone.aiOpen-source gateway and observability layer that logs LLM requests, costs and latency with a one-line integration.ObservabilityOpen source★ 6.2kW&B Weavewandb.aiWeights & Biases toolkit for tracing, evaluating and iterating on LLM applications.ObservabilityFreemium★ 1.1kHoneyHivehoneyhive.aiPlatform for testing, monitoring and evaluating AI agents across development and production.ObservabilitySee siteLangSmithlangchain.comLangChain's platform for tracing, evaluating and monitoring LLM apps and agents, framework-agnostic.ObservabilityFreemium

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LLM EvalsLeaderboardsIntegrity & DetectionLearning & TutoringAssessment & Psychometrics