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LangSmith vs Opik: catalog facts
LangSmith	Opik
Freemium Can be tried for free, with paid plans listed on its pricing page.	Free The open-source platform is free to self-host.
Web	Web, Self-hosted
Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java	Tracing, automated evaluations and dashboards together Covers RAG systems and agent workflows
Proprietary hosted service Self-hosting requires Kubernetes	Self-hosting means running several services yourself Contributors must sign a CLA
Self-hosted, Hosted service	Self-hosted
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is 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.