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