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Opik vs LangSmith: catalog facts
Opik	LangSmith
Free The open-source platform is free to self-host.	Freemium Can be tried for free, with paid plans listed on its pricing page.
Web, Self-hosted	Web
Tracing, automated evaluations and dashboards together Covers RAG systems and agent workflows	Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java
Self-hosting means running several services yourself Contributors must sign a CLA	Proprietary hosted service Self-hosting requires Kubernetes
Self-hosted	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.