SlabMath vs Centrd
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SlabMath
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Should you grade your card? SlabMath gives you the answer — and the math to prove it. We're not just another grade predictor. Anyone can guess a grade. SlabMath tells you if grading is actually worth it by calculating your expected return after grading fees, shipping costs, and real market value. No more guessing. No more losing money on cards that weren’t worth the slab. THE SLABMATH DIFFERENCE Upload your card → Get a grade prediction → See what that grade sells for → Subtract grading costs → Get a clear verdict. Grade It. Sell Raw. Or Hold. SlabMath helps collectors make smarter grading decisions using real data and AI-powered analysis. HOW IT WORKS 1. Snap photos of your card’s front and back 2. AI analyzes centering, corners, edges, and surface condition 3. Receive grade probability estimates (10, 9, 8 or lower ranges) based on industry grading standards 4. View recent market sales data for similar graded cards 5. Factor in grading fees and associated costs 6. Get a data-driven verdict based on expected value FEATURES • AI-powered card condition analysis • Grade probability estimates based on major grading standards • Market price insights from recent sales • Expected value calculation after grading costs • Simple verdict: Grade It, Sell Raw, or Hold SUPPORTED TRADING CARD GAMES SlabMath works with many popular collectible trading card games and card sets from major fantasy, anime, and collectible franchises. WHY COLLECTORS TRUST SLABMATH • Grade prediction plus ROI analysis in one place • Market pricing based on recent sales data • Automatic grading cost calculations • Works across multiple major trading card games Try your first scan free. Upgrade for unlimited access. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Disclaimer SlabMath is an independent card grading analysis tool and is not affiliated with, endorsed by, or sponsored by any trading card publishers, brands, or grading companies. All trademarks, game titles, and brand names are the property of their respective owners.
Centrd
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FREE centering tool & grade calculator/ Centrd measures your card's centering to the exact percentage, tells you what each grading company would give it, and shows what it's worth at that grade — so you can decide before you spend $30 finding out. Works on any trading card. Pricing is currently Pokémon only — more games are coming. MEASURE ANY CARD Scan a card and Centrd finds the edges for you. Drag the four lines to the card edge and the print border, pinch to zoom up to 15× for the fine work, and read the exact left/right and top/bottom split. Front and back, because graders look at both. Works on any trading card — Pokémon, Magic, Yu-Gi-Oh, sports. EVERY GRADING STANDARD, SIDE BY SIDE PSA, BGS, CGC and TAG all publish different centering tolerances, and a card that's a 10 for one is a 9 for another. Centrd shows all four at once, with the rule behind each grade one tap away. Cards sitting right on a cutoff get flagged, because "too close to call" is more honest than a confident wrong answer. KNOW WHAT IT'S WORTH Centrd identifies your card automatically — name, set, number and artwork — and shows what it sells for. See prices at every grade, how they've moved over time, and how many copies already exist at each grade. Automatic identification and pricing currently cover Pokémon cards. Magic, Yu-Gi-Oh and sports cards can be measured and graded today, and pricing for them is the next thing being built. WORK IN BATCHES Scanning one card is fine. Preparing a submission is the real job. Group cards into batches, see the whole pile's value raw and at the grades your cards would actually earn, and work through them one at a time. WHAT'S FREE Scanning, centering, grade estimates, batches, and identifying your cards — all free, always. No ads. No watermarks. No grade hidden behind a paywall. WHAT PREMIUM ADDS Market prices at every grade, full price history, grader population reports, and batch value at the grades your cards would get. $3.99USD/month or $29.99USD/year. HONEST ABOUT WHAT IT IS Centrd measures centering. It does not assess corners, edges or surface, and it is not a grade predictor. The grades shown are what your card's centering alone would qualify for under each company's published standards. The rest is on your eyes, and the final call is always the grading company's. Not affiliated with Nintendo, The Pokémon Company, Wizards of the Coast, Konami, PSA, Beckett, CGC, TAG or SGC. Centrd Premium is an auto-renewing subscription — $3.99/month or $29.99/year. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period, and you can manage or cancel it in your Apple Account settings. Privacy Policy: https://centrd-cardgrader.netlify.app/#privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: Centrd at none against SlabMath's shown. SlabMath's advantage is device support (3 vs 1) and iOS requirement (14.0 vs 16.0). On price and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. SlabMath sells 3 in-app purchases, starting at $4.99 per month and Centrd sells 5 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | SlabMath | Centrd |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | — | Every 10 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 8 MB | 53 MB |
| Age rating | 4+ | 4+ |
| Developer | SLABMATH LLC | Justin Logan |
In-app purchases
SlabMath
- Pro$4.991 Month
- Master$9.991 Month
- Elite$49.991 Month
Centrd
- Centrd Premium7 Days trial$3.991 Month
- Centrd Premium (Yearly)$29.991 Year
- Supporter$1.99
- Big supporter$4.99
- Generous supporter$9.99









