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promptfoo is an open-source testing and evaluation framework for LLM prompts, agents, and RAG systems with red teaming capabilities and multi-model comparison support.
It is 10am. You've written three versions of a customer onboarding prompt. You paste all three into promptfoo with your test cases, set it to run against GPT-4, Claude, and Llama, and within seconds see side-by-side quality scores and failure patterns. You spot that version two handles edge cases 12% better. You ship it.
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The exact prompts, config and setup instructions are available to Followloop subscribers.
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START FOR $5 →Requires understanding prompt engineering, test case design, and some comfort with CLI/config files; no coding required, but you'll need to think about evaluation criteria upfront
Every tool in Followloop is screened like this one.
Claude will eat your time. Followloop gives it back, with interest.
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