LangSmith vs promptfoo

Pick two tools from the same category to compare side-by-side.

	LangSmith Eval, tracing, and prompt management from the LangChain team.	promptfoo Open-source CLI for prompt and LLM eval, including red-teaming.
Category	eval	eval
Vendor type	commercial	open source
Pricing	freemium	free
Strengths	+ End-to-end coverage (trace, eval, prompt) + Native LangChain/LangGraph integration	+ Open source, CLI-first + Strong red-team / security eval modules + Easy to wire into CI
Tradeoffs	− Most natural for LangChain-stack teams	− Less polished UI than commercial alternatives
Used in stacks	2	3