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