Paste two versions of a prompt and instantly see which scores higher — dimension by dimension — plus exactly what to fix on the weaker one. Stop guessing which wording works better. Free, private, no sign-up.
Paste a prompt into both A and B to see which scores higher and why.
Paste two versions of a prompt and each is scored 0–100 across the seven traits of an effective prompt — role, context, task, constraints, output format, specificity, and reusable placeholders. You get an overall winner, a dimension-by-dimension comparison, and specific fixes for the weaker version. It runs entirely in your browser.
Small wording changes can dramatically change AI output. Comparing two versions side by side shows you which structure is stronger before you commit to it — so you ship the prompt that's most likely to perform, instead of guessing.
Yes, completely free with no sign-up. The comparison is rule-based and happens locally in your browser, so your prompts are never uploaded.
Each prompt earns points across seven weighted dimensions of prompt quality; the higher total wins. The breakdown shows exactly which dimensions each version won, so you can merge the best of both.
Test them in pairs — compare A vs B, keep the winner, then test it against your next version. This 'champion vs challenger' loop is a fast way to converge on your best prompt.
Every prompt in the library is built to score high. Browse 30,000+ expert prompts, or explore the full free toolkit.