Questions and answers

Automatic measurement works on raw cards only. A sleeve, top loader or slab adds its own edges and glare, so the app would be measuring plastic instead of the card. When it detects a sleeve, it tells you and switches to manual alignment, where you line up the four card edges yourself. For the most accurate result, take the card out and rescan.

It depends on the photo and on the lines you confirm. Small shifts matter: with 3 mm borders on each side, going from 50/50 to 55/45 moves the artwork only 0.3 mm. CenterMint fits gold and silver borders edge by edge at sub-pixel level and flags the lines it is unsure about, but it does not claim a single accuracy percentage. Check flagged lines in the loupe and retake blurry or glary photos.

Yes, for free. Under each ratio the app shows how wide each border is, in millimetres or inches (you can also turn it off). It scales the measured border fractions by the card size it detects from the photo: 63 × 88 mm for standard cards, 2.5 × 3.5 in for sports cards and 59 × 86 mm for smaller cards such as Yu-Gi-Oh!. You can also pick the size yourself in Settings.

PSA’s published Gem Mint 10 guideline is approximately 55/45 or better on the front and 75/25 or better on the back. PSA 9 is approximately 60/40 on the front and 90/10 on the back. BGS and CGC publish their own scales, and some figures apply only to certain card categories. Centering is one of several criteria, so good centering alone does not guarantee a grade. Check the official pages before submitting. Full PSA, BGS and CGC centering table by grade.

For each grade it calculates: extra money = (graded price − raw price) × (1 − selling fee) − grading fee. The selling fee is paid whether you sell raw or graded, so only the price difference is reduced by it. The break-even top-grade price is raw price + grading fee ÷ (1 − selling fee). If even the second grade (such as PSA 9) makes money, the answer is worth grading; if only the top grade pays, it depends on corners and surface; if no grade pays, or centering rules out the grade that pays, it is not worth grading. The app never estimates the chance of a 10.

Yes, for 30,000+ Japanese and 28,000+ English Pokémon cards. You see recent sales in Japan, the US or Europe with a 30-day chart and a rough amount in your own currency; for Japanese cards, also the number of sales in the last 30 days and the card-shop price range. Cards without recent sales are labeled as such instead of guessed. Graded prices (PSA 10, PSA 9 and more) need Pro. Prices are references, not offers to buy or sell. For cards outside the catalog, you enter recent sold prices yourself in Worth Grading?.

No. Corner & Edge Close-ups crop the four corners and four edges from your original photo at full resolution so you can inspect them yourself. The app does not score them, and a phone photo can miss tiny flaws, so check doubtful spots under a loupe and bright light.

Free: centering measurement at full resolution, border widths in mm or inches, the loupe, the guided line check, PSA/BGS/CGC reference comparison, Corner & Edge Close-ups on 3 cards a week, a batch of up to 5 cards every week, and Worth Grading? on one card of your choice. Pro adds those pre-grading tools for every card, the Submission Log, batch scanning, the decision assistant with a submission checklist PDF, CSV and 4K exports, presets and no ads.

No. CenterMint is an independent app. Its centering references follow the companies’ published standards for comparison only, and an actual grade can differ.

Measurement runs on your iPhone without an account. Photos are uploaded only if you opt in to correction sharing (off by default) or accept the one-time batch learning notice, which you can decline. Prices and the Submission Log stay on the device.