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Langfuse vs LangSmith: catalog facts
Langfuse	LangSmith
Freemium Open source for self-hosting, with a hosted version that can be started for free.	Freemium Can be tried for free, with paid plans listed on its pricing page.
Web, Self-hosted	Web
Tracing, prompt management and evaluation in one tool Can be self-hosted or used as a hosted service	Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java
Requires instrumenting your application with its SDK Self-hosting means running and maintaining the server yourself	Proprietary hosted service Self-hosting requires Kubernetes
Self-hosted, Hosted service	Self-hosted, 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	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.