Now available on Chrome Web Store

Live Grading Data,
Right on eBay.

GradeIQ is a free Chrome extension that shows live population counts and average sale prices for graded cards — directly on eBay as you browse.

Add to Chrome — It's Free See How It Works ↓
33 Cards Tracked
5 Graders Compared
Free To Install
See It In Action
Why GradeIQ

The data you need, where you already shop

Stop switching tabs for pop lookups. GradeIQ surfaces the numbers that matter — right on the eBay listing — so you can buy and sell with confidence.

Live Population Counts

See how many cards have been graded at every tier by PSA, CGC, SGC, TAG, and AGS — updated daily from the source.

Average Sale Prices

90-day rolling averages from real eBay sales, broken down by grade tier, so you know exactly what the market is paying right now.

Cross-Grader Comparison

PSA, CGC, SGC, TAG, and AGS — side-by-side in one panel. No other eBay extension does this.

Works Right on eBay

Data appears directly on listing pages and search results. No separate lookup tool, no copy-pasting card names, no extra tabs.

Pokémon, Sports & MTG

33 high-value cards tracked — from Base Set Charizard and the 1952 Topps Mantle to Black Lotus Alpha.

Privacy First

Anonymous analytics only. GradeIQ never sells your data or tracks your browsing history.

Step 1

Install and shop on eBay like normal

Install GradeIQ from the Chrome Web Store and it activates automatically on eBay listing and search pages — no setup required.

  • ✓Works on eBay listing & search pages
  • ✓No account required to get started
  • ✓One-click install, zero configuration

Install GradeIQ Free →
GradeIQ extension popup showing tracked cards list
Step 2

See live pop counts and prices on any matched card

GradeIQ overlays a data panel directly on the listing — showing population counts and average sale prices per grade for every major grader.

  • ✓PSA, CGC, SGC, TAG & AGS population counts
  • ✓90-day average sale prices per grade tier
  • ✓All five graders shown side-by-side
eBay listing showing GradeIQ pop count badge
Step 3

Compare graders and buy with confidence

Know if a grade is scarce and what it's actually selling for — so you never overpay or miss what the market is telling you.

  • ✓Cross-grader pop comparison in one view
  • ✓Market price per grade tier
  • ✓Search page badges to spot tracked cards fast
GradeIQ data panel showing PSA, CGC, SGC, TAG and AGS pop counts and sale prices
More Features

Built for serious collectors

Every detail of GradeIQ was designed around the real needs of the card collecting community.

PSA, CGC, SGC, TAG & AGS

All five major graders tracked side-by-side — no other eBay extension covers this breadth.

Search Page Badges

Tracked cards are flagged right on eBay search results — spot what matters before you even click in.

The Cards That Matter

Charizard Base Set, 1952 Topps Mantle, Black Lotus Alpha, and 30 more iconic cards across Pokémon, Sports, and MTG.

Suggest a Card

Don't see a card you want tracked? Submit a suggestion directly from the extension and we'll review it.

Daily Data Refresh

Pop counts and sale prices are scraped and updated every day so the numbers you see are always current.

No Account Required

Jump straight in — full pop count and price data is available to all users, no sign-up needed.

Start buying smarter today

Get live population counts and sale prices for graded cards — directly on eBay as you shop. Free to install, no account needed.

Add to Chrome — Free
FAQ

Common questions

Yes — GradeIQ is completely free to install and use. Pop counts and average sale prices are available to all users with no account required.
GradeIQ tracks population counts and average sale prices across PSA, CGC, SGC, TAG, and AGS — all shown side-by-side on the same panel.
GradeIQ currently tracks 33 high-value cards across Pokémon (including Base Set Charizard, Lugia, and Mewtwo), Sports (Jordan, LeBron, Mantle, Wagner, and more), and Magic: The Gathering (Black Lotus, Mox Sapphire, Ancestral Recall). We add more cards based on community suggestions.
Population counts and sale prices are scraped and updated daily. Sale prices reflect a 90-day rolling average from completed eBay listings.
GradeIQ is currently a Chrome desktop extension. Mobile support is on our roadmap — sign up for updates to be notified when it launches.
Absolutely. GradeIQ uses anonymous analytics only and never sells your data or tracks your browsing history. No card images or personally identifiable information are ever transmitted.