Comparison

Moonitor Notifications vs Card Centering Calculator

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

Head to head
About

Moonitor Notifications

Receive important Discord notifications directly on your mobile device. This app bridges the gap between your Discord groups and your phone, ensuring you never miss critical updates. If your Discord group isn't yet supported, encourage your admins to reach out for integration.

Highlights
  • Discord notification transfer
  • Mobile alerts
  • Group notification support
  • Admin integration requests
Features
Read full description

Transfer notifications from your selected groups on discord straight to your phone. Is your group not supported by Moonitor Notifications? Tell your admins to contact us to implement Moonitor Notifications.

About

Card Centering Calculator

This app helps collectors and traders measure card centering ratios for grading. It uses AI to detect centering or allows manual adjustments for precise measurements, displaying potential grades from major companies.

Highlights
  • AI-powered card centering detection
  • Manual centering measurement with zoom
  • Grade comparisons for PSA, BGS, SGC, CGC, TAG, ACE
  • Front and back side centering measurement
  • Grading standards reference guide
  • Off-center visualization tool
Features
Read full description

Card Centering Calculator is the ultimate tool for measuring your card's centering ratios before grading. Whether you collect Pokémon, One Piece, Lorcana, Yu-Gi-Oh!, Magic, baseball, basketball, football, or other trading and sports cards, the app helps you quickly measure centering, compare grading standards, and decide if your card may be worth submitting. Scan or upload a card image to calculate real-time centering ratios, such as 55/45 or 60/40, and instantly compare the highest potential centering grades from major grading companies including PSA, BGS, SGC, CGC, TAG, and ACE. Wondering if your card has centering worthy of a Gem Mint 10? Measure it before you submit. --- Card Scanner With Auto Centering Detection --- Scan or upload your card and let the app automatically detect the card edges and calculate centering ratios. --- Precise Ratio Measurements --- Manually adjust measurement guides on each side of the card for precise centering calculations. Use zoom for ultra-accurate adjustments and fine-tuning. --- Measure in Pixels, Millimeters, or Inches --- Switch from percentages to real measurements. View each border's width in pixels, millimeters, or inches to double-check against calipers or calculate centering your own way. --- Saved Cards --- Save cards to your collection and come back to them later. Add tags, filter your saved cards, and keep track of cards you may want to grade, sell, trade, or review again. --- Perspective Fix Tool --- Correct skewed, angled, bent, or warped card images before measuring. The Perspective Fix tool helps straighten card edges so you can get cleaner and more accurate centering measurements. --- Grade Comparisons --- Instantly see the best possible centering grades from PSA, BGS, CGC, SGC, TAG, and ACE as you adjust your card's ratios. Compare grading companies and see how each company's centering standards may affect your card. --- Front and Back Side Grading --- Measure centering for both the front and back of your card, since grading standards differ between sides. --- Pokémon e-Reader Card Mode --- Measure Expedition, Aquapolis, and Skyridge e-Reader cards correctly. The dot-code strip makes the left and bottom borders wider by design, so e-Reader mode compares the top and right borders the way graders do and saves the setting with each card. --- Grading Standards Reference --- View centering standards from PSA, BGS, CGC, SGC, TAG, and ACE in one convenient reference section. --- Cropping and Image Tools --- Crop card images, upload from your photo library, scan with the camera, or upload a card image from a URL. --- Compatible With All Cards --- Use Card Centering Calculator with TCG cards, sports cards, and other collectible cards, including Pokémon, One Piece, Yu-Gi-Oh!, Lorcana, Magic: The Gathering, baseball, basketball, football, and more. Why Centering Matters: Centering plays a major role in determining a card's grade from professional grading companies. Even if a card is otherwise in excellent condition, poor centering can reduce its grade and impact its value. Card Centering Calculator helps you measure centering ratios before submitting cards for grading, giving you more information when deciding which cards to grade, sell, trade, or keep raw. Note: Card Centering Calculator focuses on measuring centering ratios. Professional grading companies such as PSA, BGS, CGC, SGC, TAG, and ACE also evaluate other factors, including corners, edges, surface wear, scratches, dents, print quality, and overall condition. This app does not assess those additional grading criteria.

Screenshots

Moonitor Notifications2 screens
Card Centering Calculator4 screens

Verdict

The call

The clearest difference is review sentiment: Card Centering Calculator at 60% against Moonitor Notifications's 17%. Card Centering Calculator also leads on rating (4.7 vs 2.5) and update cadence (monthly vs every 5 months). Moonitor Notifications's advantage is in-app purchases (none vs 5) and ads (none vs shown). On price and device support 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. Card Centering Calculator sells 5 one-off in-app purchases. Moonitor Notifications asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Card Centering Calculator holds the better App Store score, 4.7 against 2.5. That said, the two scores are not equally well evidenced: Card Centering Calculator has 2.6K ratings behind it against 59, so its average is the more settled of the two. Written reviews point the same way: 17% of Moonitor Notifications's written reviews are positive against 60% of Card Centering Calculator's.

UpkeepUpdate frequency

Moonitor Notifications ships an update every 5 months, Card Centering Calculator monthly. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

Scorecard8 real differences · 2 level
Moonitor Notifications versus Card Centering Calculator: the parameters behind the verdict, then further details
ParameterMoonitor NotificationsCard Centering Calculator
PriceFreeFree
Rating2.5 (59 ratings)4.7 (2.6K ratings) — better
Positive reviews16.7% of reviews60.0% of reviews — better
Number of ratings592.6K — better
Update frequencyEvery 5 monthsMonthly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better18.0
Further details — not scored
Size26 MB21 MB
Age rating4+4+
DeveloperZiv CohenJade Lizard Software LLC

Customer experience

Moonitor Notifications

All ratings43 ratings
Positive39.5%
Neutral4.7%
Negative55.8%
Written reviews30 reviews
Positive16.7%
Neutral16.7%
Negative66.7%

Card Centering Calculator

All ratings2,459 ratings
Positive93.4%
Neutral1.2%
Negative5.4%
Written reviews135 reviews
Positive60.0%
Neutral2.2%
Negative37.8%

Bugs and requests

Moonitor Notifications

Not enough reviews yet to summarise bugs or requests.

Card Centering Calculator

Reported bugs

2 issues
  • Centering measurement resets during use
  • Image rotation doesn't stay in place

Requested features

2 requests
  • Thinner and dashed centering lines for better visibility
  • Free access to grading information without subscription

In-app purchases

None

Moonitor Notifications

No in-app purchases

5 purchases

Card Centering Calculator

One-time5
  • Small Tip$0.99
  • Medium Tip$1.99
  • Unlock Premium$4.99
Show 2 more
  • Large Tip$4.99
  • Pristine Tip$9.99

Questions

Is Moonitor Notifications free?
Moonitor Notifications is free to download, with no in-app purchases.
Is Card Centering Calculator free?
Card Centering Calculator is free to download, with in-app purchases available.
Which has better reviews, Moonitor Notifications or Card Centering Calculator?
Card Centering Calculator is rated higher. Moonitor Notifications averages 2.5 out of 5 from 59 ratings, while Card Centering Calculator averages 4.7 from 2.6K ratings.
Do Moonitor Notifications or Card Centering Calculator have ads?
Card Centering Calculator shows ads; Moonitor Notifications does not.
Which is updated more often, Moonitor Notifications or Card Centering Calculator?
Moonitor Notifications ships an update every 5 months, and Card Centering Calculator monthly. Most recently, Moonitor Notifications was updated on October 24, 2026 and Card Centering Calculator on October 30, 2026.

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