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Weights & Biases vs MLflow: catalog facts
Weights & Biases	MLflow
Freemium Offers free use with paid plans for teams.	Free Free and open source.
Web	Web, Self-hosted, Command line
Experiment tracking and comparison in one dashboard Covers both classic ML training and LLM tracing	Tracing built on OpenTelemetry, independent of LLM provider 50+ built-in evaluation metrics and LLM judges
Requires an account and sends data to a hosted service Proprietary platform	Broad feature set takes time to learn Running it for a team means hosting and maintaining a server yourself
Hosted service	Downloadable app, Self-hosted
Closed source	Open source
License not stated	License: Apache-2.0
Account needed	No account needed
Not stated if it works offline	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.