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Weights & Biases vs LangSmith: catalog facts
Weights & Biases	LangSmith
Freemium Offers free use with paid plans for teams.	Freemium Can be tried for free, with paid plans listed on its pricing page.
Web	Web
Experiment tracking and comparison in one dashboard Covers both classic ML training and LLM tracing	Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java
Requires an account and sends data to a hosted service Proprietary platform	Proprietary hosted service Self-hosting requires Kubernetes
Hosted service	Self-hosted, Hosted service
Closed source	Closed source
License not stated	License not stated
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.