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Promptscore – AI Prompt Evaluator Extension

Promptscore – AI Prompt Evaluator Extension

Manifest V3 Chrome extension that scores & optimizes ChatGPT & Gemini prompts.

Jul 30, 2026 AI & Machine Learning
chatgpt chrome extension gemini prompt engineering prompt-optimization

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Promptscore – AI Prompt Evaluator Extension

About

Promptscore is a fully functional, published Chrome extension (Manifest V3) that scores, evaluates, and rewrites prompts directly inside ChatGPT and Gemini UIs.**Key Features:*** Seamless Floating Action Button (FAB) UI injected natively on ChatGPT and Gemini.* Real-time prompt evaluation, scoring, and actionable rewrites.* $0 Running Costs: Operates 100% client-side locally with zero server overhead or API maintenance required.* Published on the Chrome Web Store and ready to scale.**Why I'm Selling:**I am a builder who handles technical execution and product design. I do not specialize in marketing or distribution, so I am looking to hand this over to an operator or developer who can monetize it.**Growth & Monetization Potential for Buyer:*** Add Stripe / LemonSqueezy paywall for premium rewrite tiers.* Connect custom OpenAI / Claude API keys for advanced model responses.* Monetize via affiliate links for AI tools or prompt courses.**What's Included:*** Complete Extension Source Code (JavaScript/HTML/CSS).* Full Ownership Transfer of the active Chrome Web Store Listing.* High-res brand assets, promotional banners, and logo files.Export Capabilities: One-click download feature allowing users to export their last 10 prompts, scores, and optimized rewrites into a structured PDF or CSV table

Comments (2)

Juliet Hoppe Juliet Hoppe 3 weeks ago

how does the scoring work under the hood, local heuristics or api calls?

Orville Kozey Orville Kozey 3 weeks ago

what scoring criteria does it actually use