CenterMint
Language: English
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Card centering before grading

Measure the borders, look up what the card sells for, then decide whether it is worth the grading fee.

Download on the App Store
Scan with your iPhone camera to open CenterMint in the App Store.
Charizard from the 1999 Pokémon Base Set with measuring lines on the inner edge of its yellow border: left/right 54.4 / 45.6, top/bottom 51.9 / 48.1
54.4 / 45.6 51.9 / 48.1

CenterMint is an iPhone app for trading-card and sports-card collectors. It measures left/right and top/bottom centering from a photo of a raw card, compares the result with the published PSA, BGS and CGC centering references, shows prices for 30,000+ Japanese and 28,000+ English Pokémon cards in Japan, the US and Europe, and helps you decide before you pay to grade. It is an independent tool: it measures centering only and does not predict a full grade.

See it in the app

Six short loops, one task each. The screens are simplified; the card and its numbers are real.

  1. Scan and measure

    It finds the card edge and the printed border and gives both ratios.

  2. Check each line

    The loupe goes to a line. Drag it onto the edge if needed, then tap Looks Right.

  3. Worth Grading?

    Type the sold prices and see what a PSA 10 or a PSA 9 would earn after fees.

  4. Corner & Edge Close-ups

    Four corners and four edges from the original photo. Tap one to look closer.

  5. Submission Log

    Log what you send and move it from Preparing to Sent to Returned.

  6. Share Studio

    Pick a layout and choose whether the measuring lines show.

Drawn live in your browser. The prices in Worth Grading? are an example.

How to measure card centering with CenterMint

Measuring that tells you when to look closer

  1. Step 1 of 5

    Lay it flat

    Take the card out of its sleeve and lay it flat on a plain mat that contrasts with the border. Photograph it in even light, or import a photo or scan.

    Raw cards only. Cards in sleeves, top loaders or graded slabs are measured by lining up the four edges yourself. When the app detects a sleeve, it tells you and switches to manual alignment.

  2. Step 2 of 5

    Find the edges

    CenterMint suggests the outer card edge and the printed inner border. If any line is uncertain, it walks you through those lines one by one with the loupe and tells you why.

    Automatic measurement for raw cards, with edge-by-edge sub-pixel fitting on gold and silver borders and a more reliable outer edge on cloth and patterned mats.

  3. Step 3 of 5

    Confirm each line

    Confirm or nudge each line. The left/right and top/bottom ratios update as you go.

    Loupe 2.0 shows real pixels with a pixel grid and an edge profile, and links opposite edges so you can compare both sides.

    Every measurement uses the full-resolution photo, in the free version too.

  4. Step 4 of 5

    Compare with the references

    Measure the back as well and compare both sides with the PSA, BGS or CGC reference.

    CenterMint result screen with the left/right and top/bottom centering of a sample card

  5. Step 5 of 5

    Check before you send it

    Before you submit, look through the corner and edge close-ups and run Worth Grading? with recent sold prices.

Know the price before you grade

Versions 2.0 and 2.1 add prices for Japanese and English Pokémon cards, price alerts, a collection that tracks what your cards are worth, and a Worth Grading? that fills in the prices for you.

All features

Free and Pro

Free

$0

  • Front and back centering measurement at full resolution
  • Loupe and the guided line check, with the reason each line needs a look
  • Comparison with PSA, BGS and CGC centering references

CenterMint Pro

Pro: $4.99 a month or $29.99 a year. The yearly plan starts with a 1-week free trial.

  • Graded prices (PSA 10, PSA 9 and more), full price history, unlimited price alerts and a collection value chart
  • Worth Grading? and Corner & Edge Close-ups for every card
  • Submission Log

Plans and prices

Card centering and grading FAQ

Can CenterMint measure a card in a sleeve, top loader or graded slab?

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.

How accurate is the centering measurement?

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.

What centering does a PSA 10 need?

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.

What is free and what needs Pro?

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.

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