Card Comp Check

One-click eBay sold-listing comps on the page: median price, low–high range, and verified recent sales with zero guessed numbers.

What did this card actually sell for? Card Comp Check puts the answer right on the eBay page. Open any trading-card listing, click Check Comps, and get an instant summary of recent sold listings: the median sold price, the full price range, how many sold, and when — plus one-click filters for raw vs. graded copies. Honest numbers, no guesswork. eBay hides the final price on accepted best offers, and thin markets lie with small samples. Card Comp Check labels both: hidden best-offer prices are counted but never folded into the median, and anything under five comps gets an explicit thin-data warning. Missing data is shown as missing — never interpolated, never invented. For the hidden best-offer prices, the panel links out to a dedicated lookup tool instead of guessing. Built for collectors, priced for everyone: free. No subscription, no account, no login, no API key. Everything is computed in your browser from eBay's own public sold-listings pages — the same pages you'd check by hand, minus the spreadsheet. Privacy: zero data collection. The extension makes no network calls of its own, runs no analytics, and stores nothing off your device. Your settings and last lookup live only in Chrome storage on your machine.