No. 15 of 32 ·AI Agent Observability Tools

MLflow Tracing

Web · Self-hosted · API

Freedom report

Two barsScore 6.4

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

MLflow Tracing is ranked #15 of 32 in AI agent observability tools on Freedom251. It runs on API, Self-hosted, Web. There is a free plan.

MLflow Tracing plans and pricing

All plans

MLflow Tracing Free Open source · trace data hosted on your own infrastructure mlflow.org · 30 Sept 2026

Compared on AI agent observability tools

Free plan: Yes
Session replay: Yes
Prompt and tool tracing: Yes
Deployment options: hybrid
Agent framework support: open_standard
Cost tracking: Yes

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The record

Purpose: MLflow Tracing captures inputs, outputs, and metadata from each step of LLM application and agent requests to help diagnose bugs and unexpected behavior.
Trace views: Trace details include a span tree, per-span latency, inputs and outputs, tool calls, exception details, token counts, cost breakdown, feedback, and ground-truth annotations.
Automatic tracing: The integrations page lists automatic tracing for more than 40 LLM and AI agent libraries and frameworks.
Integrations: Listed integrations include OpenTelemetry, OpenAI, Anthropic, LangChain, LangGraph, LlamaIndex, DSPy, Vercel AI, and other frameworks, providers, gateways, and tools.
Manual instrumentation: The Python and TypeScript SDKs provide manual tracing APIs, and the Python SDK supports synchronous and asynchronous functions with the documented version requirements.
Production use: The documentation describes tracing as production-ready and recommends asynchronous logging and sampling for production deployments.
Lightweight SDK: The production tracing package, `mlflow-tracing`, is documented as having a 95% smaller footprint than the full `mlflow` package.
OpenTelemetry: MLflow Tracing is OpenTelemetry-compatible and supports GenAI Semantic Conventions for trace export and ingestion.
Sensitive data: Custom span processors can mask sensitive data on the client before spans are sent to the backend.
Server security: MLflow 3.5.0 and later include middleware for DNS rebinding, CORS, and clickjacking protections; the server documentation recommends a reverse proxy or VPN for TLS and authentication in production.
OTLP ingestion limit: OpenTelemetry trace ingestion requires MLflow 3.6.0 or later and a SQL-based backend store.
Browser limitation: The TypeScript SDK works in Node.js backend environments and is not compatible with frontend browser or Edge Runtime environments.
Maker and community: The MLflow site describes the project as backed by the Linux Foundation and committed to open source for more than five years.
Price from: Free

Where it ranks on Freedom251

Best AI Agent Observability Tools in 2026#15 of 32
Best AI LLM Observability Tools in 2026#12 of 23

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Sources

mlflow.org/docs/latest/llms/tracing/· checked 30 Sept 2026
mlflow.org/docs/latest/genai/tracing/observe-with-· checked 30 Sept 2026
mlflow.org/docs/latest/genai/tracing/integrations· checked 30 Sept 2026
mlflow.org/docs/latest/genai/tracing/app-instrumen· checked 30 Sept 2026
mlflow.org/docs/latest/tracing/production· checked 30 Sept 2026
mlflow.org/docs/latest/genai/tracing/observe-with-· checked 30 Sept 2026
mlflow.org/docs/latest/self-hosting/architecture/t· checked 30 Sept 2026
mlflow.org/docs/latest/genai/tracing/opentelemetry· checked 30 Sept 2026
mlflow.org/docs/latest/genai/tracing/faq/· checked 30 Sept 2026
mlflow.org· checked 30 Sept 2026