Observability

14 tools
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OSSFreePopular

Langfuse

OSS LLM engineering platform (acquired by ClickHouse, Jan 2026)

⭐ 7,000
OSSFree

MLflow

Open-source MLOps platform with LLM experiment tracking and tracing

⭐ 19,800
OSSFree

Opik

Open-source LLM tracing and evaluation platform by Comet

⭐ 4,200
OSSFree

Arize Phoenix

ML/LLM observability and evaluation platform

⭐ 4,000
Free

AgentOps

Observability and replay platform built specifically for AI agents

⭐ 3,100
OSSFree

Helicone

LLM observability, cost tracking, request logging

⭐ 2,500
OSSFree

Traceloop

OpenTelemetry-based LLM observability

⭐ 2,000
OSSFree

LangWatch

LLM observability and evaluation with OpenTelemetry support

⭐ 2,000
Free

LangSmith

LLM tracing, evaluation, and dataset management

Free

Braintrust

AI evaluation platform with datasets and prompt mgmt

Free

Logfire

Observability platform by the Pydantic team

Free

Weights & Biases

ML experiment tracking and LLM evaluation

Free

Maxim AI

Agent-specific testing and observability platform

Free

Galileo

Real-time LLM evaluation with sub-200ms guardrail models

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