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LangSmith vs TruLens: catalog facts
LangSmith	TruLens
Freemium Can be tried for free, with paid plans listed on its pricing page.	Free Free and open source.
Web	Windows, macOS, Linux
Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java	OpenTelemetry-native tracing of every agent step Judges explain their scores, not just give numbers
Proprietary hosted service Self-hosting requires Kubernetes	Aimed at developers comfortable writing code LLM judges add their own model calls and cost
Self-hosted, Hosted service	Downloadable app
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 October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.