How much is Promptscore – AI Prompt Evaluator Extension?

Promptscore – AI Prompt Evaluator Extension is listed for sale at $1,500 USD.

Promptscore – AI Prompt Evaluator Extension - Sell Project

Listed July 29, 2026

About Promptscore – AI Prompt Evaluator Extension

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

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

Project details

Website: https://chromewebstore.google.com/detail/promptscore/jnmljihbacgkhmplplidmdpjldpjalfa

Video 1: https://drive.google.com/file/d/1_oKASKIgAFHGUEjPneiRVS6sy1TDKUq3/view?usp=drivesdk

Next step: • Implement Freemium Tiers: Add Stripe or LemonSqueezy to charge for unlimited rewrites or advanced features.• Custom API Integration: Allow users to bring their own OpenAI or Claude API keys for higher quality rewrites.• Email Capture & Auth: Add a simple login backend to build a subscriber list of active AI users.• Affiliate Marketing: Monetize power users via affiliate recommendations for AI prompt engineering tools and courses.

For sale

Asking price: $1,500 USD

What's included

Source code, All related design work, Email account

Full Chrome Web Store developer listing transfer, complete promotional graphics package (banners, screenshots, logos), and 14 days of post sale handoff assistance.

Reason for selling

I feel that the project requires skills that I do not necessarily have and would like to see someone else take over.

Project metrics

Average Monthly Revenue: Pre-revenue

Average Monthly Downloads: Under 1K/mo