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Improve your AI prompts with A/B testing — powered by PromptLab Improve your AI prompts instantly with data-backed A/B testing. PromptLab watches as you type in ChatGPT or Claude. Click "✦ Improve with PromptLab" and we'll automatically generate 2 improved versions of your prompt, score all three using GPT-4o, and show you the winner — so you always send the best possible prompt. Features: - Works on ChatGPT and Claude - Generates 2 improved prompt versions instantly - A/B tests and scores each version (1–5) on clarity, specificity, and effectiveness - Shows you both versions so you can pick your favorite - One-click prompt replacement