GemnetV4

Estimates PSA grades on cards and PCGS/NGC grades on coins using AI vision. Identify valuable ungraded collectibles.

As of June 2026, GemnetV4 has 5 users and a 5.00/5 rating from 1 reviews in the Shopping category.

Usersdown 44.4 percent44.4%
5
5
Ratingno change0%
5.00
1 reviews
Reviewsno change0%
1
Version
4.0.0
Manifest V3

History

6 snapshots

Tracking since Apr 19, 2026.

10.47.54.6Apr 19, 2026Jun 6, 2026
View as table
DateUsersRatingReviewsVersion
Apr 19, 202695.0014.0.0
Apr 29, 2026105.0014.0.0
May 8, 202685.0014.0.0
May 16, 202675.0014.0.0
May 25, 202695.0014.0.0
Jun 6, 202685.0014.0.0
Now55.0014.0.0

Permissions & access

Permissions
storage
Host access
https://replit-backend-Filetmignonpapi.replit.app/*, https://api.openai.com/*, https://www.ebay.com/*, https://www.tcgplayer.com/*, https://www.cardmarket.com/*

Screenshots

GemnetV4 screenshot 1GemnetV4 screenshot 2

About

Grade Estimator - AI-Powered Collectible Grading Assistant

Grade Estimator uses AI vision to estimate PSA grades for collectible cards and PCGS/NGC grades for coins. Identify valuable ungraded items on eBay, TCGPlayer, and CardMarket.

Key Features:
- Dual Grading Modes: Switch between card grading (PSA 1-10) and coin grading (MS-70 to PO-1)
- AI-Powered Analysis: Uses advanced vision AI to assess condition factors including:
  - Cards: Centering, corners, edges, and surface quality
  - Coins: Strike, surface preservation, luster, wear, and marks
  - Smart Detection: Automatically identifies already-graded items and skips multiple-item listings
  - Price Estimates: See estimated market value at the highest grade (PSA 10 for cards, MS-70 for coins)
  - Grading Cost Calculator: View estimated grading costs from PSA and PCGS/NGC based on item value
  - Batch Scanning: Process listings in batches of 10 with automatic sorting by grade and confidence
  - Grade Caching: Grades are saved so you don't need to re-scan the same items
- Customizable Settings: Adjust badge position, opacity, tooltip delay, and more
- Keyboard Shortcut: Quick scan with Ctrl+Shift+S (Cmd+Shift+S on Mac)

Perfect For:
- Collectors looking for undervalued raw cards and coins
- Dealers identifying grading opportunities
- Anyone buying collectibles online who wants condition insights

How It Works:
- Enter your OpenAI API key in the extension settings
- Visit eBay, TCGPlayer, or CardMarket search results
- Click the scan button or use the keyboard shortcut
- View grade estimates with confidence levels and detailed condition analysis
- Sort listings by highest grades to find the best opportunities

Privacy & Transparency:
- Your API key is stored securely in Chrome's sync storage
- All analysis happens through OpenAI's API
- We use affiliate links to keep the extension free (disclosed in settings)
- Full privacy policy available in extension settings
- Start finding hidden gems in collectible listings today.

Note: Requires an OpenAI API key. The extension uses your API credits for analysis. Usage statistics are tracked so you can monitor costs.

Technical

Version
4.0.0
Manifest
V3
Size
106KiB
Min Chrome
88
Languages
1
Featured
No

Metadata

ID
fkpnbhmabgkhmiinejmnllkkdebhcdoe
Developer ID
u0f3da0b3f78cca9f4ad1cf2b0fb94648
Developer Email
[email protected]
Created
Nov 13, 2025
Last Updated (Store)
Nov 19, 2025
Last Scraped
Jun 6, 2026
Website
Support URL

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Data sourced from the Chrome Web Store · last verified Jun 6, 2026.