Comparison

Centering50 vs KŌINI Dice

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Centering50

This tool helps collectors accurately measure card centering ratios for TCG and sports cards. It uses AI-assisted scanning and manual guides to provide precise measurements, helping users predict grades and save on submission fees.

Highlights
  • AI-assisted border detection
  • Manual measurement guides
  • Front and back analysis
  • 15x precision zoom
  • Grading standard library
  • Dynamic contrast adjustment
Features
Read full description

Centering50: TCG & Sports Card Grading Tool Stop guessing and start grading with confidence. Whether you are a hardcore Pokémon TCG investor, a sports card flipper, or a casual collector, centering is the #1 reason cards fail to hit a Gem Mint 10. Centering50 is the professional-grade scanner designed to help you predict your grade before you spend a cent on submission fees. WHY CENTERING MATTERS In the modern hobby, the price gap between a PSA 9 and a PSA 10 can be thousands of dollars. Professional graders at PSA, BGS, SGC, CGC, and TAG use digital precision to measure border ratios. If your card is even 2% off, you lose the Gem Mint dream. Centering50 brings that same laboratory precision to your smartphone. PRECISION FEATURES FOR COLLECTORS: "Smart-Snap AI: Our algorithm helps you detect card borders for lightning-fast scanning of modern Pokémon, Magic: The Gathering (MTG), Lorcana, and One Piece cards. Save time with AI-assisted alignment, then fine-tune for 0.1% precision." Auto-Straighten Technology: Don't worry about perfect alignment. Scan at any angle and the app will instantly fix the tilt. The "Magenta Line" Manual Mode: For vintage cards or thick-bordered sports cards (Topps, Panini, Upper Deck), use our high-contrast measurement guides to set your own anchor points with 0.1% accuracy. Grading Standard Library: Instantly compare your results against the official 2026 standards: PSA: 55/45 Front (New 2025 Standard) BGS: 50/50 for Black Label eligibility SGC & CGC: Real-time centering thresholds Front & Back Analysis: Don't get rejected for a 90/10 back! Measure both sides independently to ensure your submission is truly "Perfect." 15x Precision Zoom: Perfectly align your guides on thin silver or gold borders with our enhanced magnification tool. SAVE MONEY ON SUBMISSION FEES Sending cards to be graded is expensive. Why pay for a "Near Mint 7" when you could have known the result at home? Use Centering50 to filter your collection and only send your strongest candidates. It’s the ultimate pre-grading utility for: Pokémon TCG (English & Japanese) Sports Cards (Basketball, Baseball, Football, Soccer) Disney Lorcana & One Piece TCG Yu-Gi-Oh! & Magic: The Gathering DESIGNED FOR THE 2026 HOBBYIST We know you’re scanning in different lighting. Our app features Dynamic Contrast Adjustment and Skew Correction, so even if your photo is slightly tilted, our math remains perfect. HOW TO USE: Place your card on a high-contrast, flat surface (no sleeves for best results). Take a photo directly from above. (with the green bubble in center) Align the Centering50 guides with the card edges and the internal art border. (Optionally: Unlock the image and move/resize/rotate) Get your LR (Left/Right) and TB (Top/Bottom) ratios instantly. JOIN THE 50/50 CLUB Centering50 isn't just a calculator; it’s your secret weapon in the grading game. Download now and take the guesswork out of your collection. Note: Centering50 provides a highly accurate estimate based on physical centering. Final grades are determined by professional grading companies based on additional factors like surface, corners, and edges. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

KŌINI Dice

This app generates 99 individual six-sided dice rolls instantly using your device's cryptographic random number generator. It provides true entropy, ensuring each roll is exactly fair with a 1 in 6 probability for each face. The app operates completely offline with no ads, accounts, or tracking.

Highlights
  • Generates 99 six-sided dice rolls
  • Uses device's cryptographic random number generator
  • Provably fair results
  • Operates completely offline
  • No ads, accounts, or tracking
  • Displays per-face counts and running total
Features
Read full description

KŌINI Dice is a beautifully simple, provably fair dice roller. Press once and it generates 99 individual six-sided dice rolls — instantly, right on your device. Every roll is created the moment you press the button, using your iPhone's built-in cryptographic random number generator. Nothing is pre-computed, nothing is stored, and there is no pool of numbers to pick from. Each of the 99 results is generated from scratch, in real time. TRUE ENTROPY The randomness comes straight from your device's operating-system cryptographic core (SecRandomCopyBytes). It is never seeded, cached, or reused between presses. EXACTLY FAIR Each die face lands with a probability of exactly 1 in 6. KŌINI Dice uses precise byte-level sampling so no face is ever favored — fairness by construction, not by approximation. COMPLETELY OFFLINE The app never touches the network. It has no ads, no accounts, no analytics, and no tracking of any kind. It collects no data whatsoever. WHAT YOU SEE - One button: Roll 99 - All 99 results, shown roll by roll - Per-face counts and the running total - A clear breakdown of how the entropy engine works Whether you are gaming, teaching probability, settling a decision, or you simply love genuinely fair randomness, KŌINI Dice gives you 99 honest rolls every time — with 6^99 possible outcomes for a single press. No sign-up. No ads. No data. Just fair dice.

Screenshots

Centering503 screens
KŌINI Dice3 screens

Verdict

The call

The clearest difference is in-app purchases: KŌINI Dice at none against Centering50's 3. KŌINI Dice also leads on ads (none vs shown) and rating (4.9 vs 4.6). Centering50's advantage is ratings volume (42 vs 10). On price, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Centering50 sells 3 in-app purchases, starting at $4.99 per month. KŌINI Dice asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

KŌINI Dice holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 42 and 10 respectively.

Scorecard5 real differences · 5 level
Centering50 versus KŌINI Dice: the parameters behind the verdict, then further details
ParameterCentering50KŌINI Dice
PriceFreeFree
Rating4.6 (42 ratings)4.9 (10 ratings) — better
Positive reviews0.0% of reviews—
Number of ratings42 — better10
Update frequencyEvery 8 days—
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhoneiPhone, iPad — better
Requires iOS16.2 — better16.4
Further details — not scored
Size155 MB28 MB
Age rating17+4+
DeveloperFUK WAI LIKoini Global LLC

In-app purchases

3 purchases

Centering50

Subscriptions2
  • Unlimited Monthly$4.991 Month
  • Unlimited Yearly$24.991 Year
One-time1
  • Full Version Lifetime Access$49.99
None

KŌINI Dice

No in-app purchases

Questions

Is Centering50 free?
Centering50 is free to download, with in-app purchases available.
Is KŌINI Dice free?
KŌINI Dice is free to download, with no in-app purchases.
Which has better reviews, Centering50 or KŌINI Dice?
KŌINI Dice is rated higher. Centering50 averages 4.6 out of 5 from 42 ratings, while KŌINI Dice averages 4.9 from 10 ratings.
Do Centering50 or KŌINI Dice have ads?
Centering50 shows ads; KŌINI Dice does not.

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