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MLflow vs LangSmith: catalog facts
MLflow	LangSmith
Free Free and open source.	Freemium Can be tried for free, with paid plans listed on its pricing page.
Web, Self-hosted, Command line	Web
Tracing built on OpenTelemetry, independent of LLM provider 50+ built-in evaluation metrics and LLM judges	Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java
Broad feature set takes time to learn Running it for a team means hosting and maintaining a server yourself	Proprietary hosted service Self-hosting requires Kubernetes
Downloadable app, Self-hosted	Self-hosted, Hosted service
Open source	Closed source
License: Apache-2.0	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 26, 2026	Official website Full listing and sources Checked September 26, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.