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Weights & Biases vs Langfuse: catalog facts
Weights & Biases	Langfuse
Freemium Offers free use with paid plans for teams.	Freemium Open source for self-hosting, with a hosted version that can be started for free.
Web	Web, Self-hosted
Experiment tracking and comparison in one dashboard Covers both classic ML training and LLM tracing	Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service
Requires an account and sends data to a hosted service Proprietary platform	Requires instrumenting your application with its SDK Self-hosting means running and maintaining the server yourself
Hosted service	Self-hosted, Hosted service
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is 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.