PromptProof

PromptProof

Test your LLM prompts with statistical confidence

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PromptProof brings statistical rigor to prompt engineering. Confidence intervals tell you if gains are real, not noise. Test images, videos, and PDFs on major LLMs in one place. Auto-Refine optimizes prompts on your labeled data under a cost cap, returning the top 3 by accuracy and cost. Decision Lab compares adoption candidates on accuracy, stability and cost. In production, trace real inputs and label them to validate accuracy. Built by an ML engineer tired of "improvements" he couldn't prove.

PromptProof launches

Launch date
PromptProof Auto-Refine
PromptProof Auto-RefinePrompt optimization proven on your own data

Launched on November 3rd, 2026

PromptProof
PromptProofTest your LLM prompts with statistical confidence

Launched on April 12th, 2026