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