CarDealCheck

About

STOP OVERPAYING FOR USED CARS

Car Deal Check drops a small AI widget onto Craigslist, Autotrader and Facebook Marketplace.  
Click “Analyze Price” and, in under 2 seconds, you’ll see:

• VERDICT — FAIR, OVERPRICED or UNDERPRICED  
• EXACT % above / below today’s market median  
• 3 NEGOTIATION LINES you can paste to the seller

First 3 checks are free. After that, a 10-pack costs less than $1 per report.

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HOW IT WORKS
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1  Automatically detects VIN and price on the page (no copy-paste).  
2  Fetches live market comps for the same year, trim and mileage.  
3  OpenAI GPT-4o mini turns raw numbers into plain-English advice.

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SUPPORTED SITES  (v1.0)
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• craigslist.org (all regions)  
• autotrader.com  
• cars.com  
• bringatrailer.com (beta)  
• facebook.com/marketplace (desktop beta)

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FREE VS PAID
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FREE TRIAL – 3 full valuations, no card required.  
10-PACK $9 – 10 credits, never expire.  
UNLIMITED $39 / month – unlimited checks + upcoming price-drop alerts.  
Secure checkout handled by Stripe.

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PERMISSIONS EXPLAINED
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activeTab     – read the listing HTML you’re viewing  
storage       – save anonymous user ID & free-check counter  
Host sites    – run only on the car-listing domains above  
https://car-deal-check.com/* – call our valuation API

No ads, no personal data collected. Privacy policy: https://car-deal-check.com/privacy

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WHY BUYERS LOVE IT
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• Average users avoid overpaying by $2 100  
• One-click insight instead of hours on price guides  
• Negotiation lines written for you by AI  
• Works on any desktop browser running Chrome extensions

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ROADMAP
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• Safari and Edge versions  
• Trade-in valuation  
• Email alerts when a watched VIN drops in price

Never guess a car’s real value again. Install Car Deal Check today and buy with confidence!