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LangSmith vs Promptfoo: catalog facts
LangSmith	Promptfoo
Freemium Can be tried for free, with paid plans listed on its pricing page.	Freemium The open-source CLI is free; enterprise features are sold separately.
Web	Command line
Detailed step-by-step agent tracing SDKs for Python, TypeScript, Go and Java	Runs from the command line with a single npx command Compares prompts and models side by side
Proprietary hosted service Self-hosting requires Kubernetes	Red-teaming features are intended for authorized testing of your own applications Some reporting features belong to the paid enterprise edition
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 September 26, 2026

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