Comparison

SpotOn Grading System Comic Ed 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

SpotOn Grading System Comic Ed

Quickly grade comic books on the spot with a series of multiple-choice questions. Get grades comparable to professional services and track your past assessments. Offers a YouTube tutorial for guidance.

Highlights
  • On-the-spot comic book grading
  • Multiple-choice question format
  • Comparable to third-party grading
  • Track past graded books
  • Identify Qualified or Restored labels
  • Video tutorial available
Features
Read full description

SpotOn Grading Systems, or SGS, is a series of short, multiple choice questions enabling you to grade your comic books on-the-spot and accurately, within seconds. SGS grades are comparable to the third party grading companies such as CGC, CBCS, etc. Some of the highlights of the app are: • All books you've graded are kept in a list on your account allowing you to review your past books and grades. • You’ll have an idea whether your book would receive a Qualified or Restored label. • Multiple choice questions are simple and easy follow and are broken down into different categories of the book’s areas. • Answers are simple and have examples of everyday items to use as examples of size comparison. • A YouTube video tutorial is available to teach you situations and examples you wouldn’t normally have standard knowledge of. Unlimited Grading for One Year: The subscription fee for unlimited comic book gradings for 1 year will be $14.99/year. If you decide to subscribe, payment will be charged to your iTunes Account upon confirming your purchase. The $14.99/year subscription fee will automatically renew unless auto-renew is turned off in your App Store Account Settings. To avoid being billed for a subsequent year, you must turn off auto-renewal at least 24-hours before the end of the current period. You can manage your subscription by going to your App Store Account Settings after purchase. If you decide to leave auto-renewal on, you will be charged $14.99/year for renewing your subscription to unlimited grading within 24-hours prior to the end of the current period. Any unused portion of your free grading trial will be forfeited when you purchase a subscription. Privacy Policy: http://fenixflamecomics.com/privacy/ Terms of Service: http://fenixflamecomics.com/tos/ Video Tutorial: https://www.youtube.com/watch?v=EOA0949K0-8

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

SpotOn Grading System Comic Ed4 screens
Card Centering Calculator4 screens

Verdict

The call

The clearest difference is review sentiment: Card Centering Calculator at 60% against SpotOn Grading System Comic Ed's 13%. Card Centering Calculator also leads on rating (4.7 vs 3.3) and ratings volume (2.5K vs 24). SpotOn Grading System Comic Ed's advantage is ads (none vs shown) and iOS requirement (12.4 vs 18.0). On price, in-app purchases, monetization model 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. SpotOn Grading System Comic Ed sells 1 in-app purchase, starting at $14.99 per year and Card Centering Calculator sells 5 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Card Centering Calculator holds the better App Store score, 4.7 against 3.3. That said, the two scores are not equally well evidenced: Card Centering Calculator has 2.5K ratings behind it against 24, so its average is the more settled of the two. Written reviews point the same way: 13% of SpotOn Grading System Comic Ed's written reviews are positive against 60% of Card Centering Calculator's.

UpkeepUpdate frequency

SpotOn Grading System Comic Ed ships an update every 5 months, Card Centering Calculator monthly. The most recent releases landed on October 3, 2026 and October 19, 2026 respectively.

Scorecard6 real differences · 4 level
SpotOn Grading System Comic Ed versus Card Centering Calculator: the parameters behind the verdict, then further details
ParameterSpotOn Grading System Comic EdCard Centering Calculator
PriceFreeFree
Rating3.3 (24 ratings)4.7 (2.5K ratings) — better
Positive reviews12.5% of reviews60.3% of reviews — better
Number of ratings242.5K — better
Update frequencyEvery 5 monthsMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.4 — better18.0
Further details — not scored
Size92 MB21 MB
Age rating4+4+
DeveloperFenix Flame Comics, LLCJade Lizard Software LLC

Customer experience

SpotOn Grading System Comic Ed

All ratings24 ratings
Positive50.0%
Neutral12.5%
Negative37.5%
Written reviews8 reviews
Positive12.5%
Neutral37.5%
Negative50.0%

Card Centering Calculator

All ratings2,459 ratings
Positive93.4%
Neutral1.2%
Negative5.4%
Written reviews131 reviews
Positive60.3%
Neutral2.3%
Negative37.4%

Bugs and requests

SpotOn Grading System Comic Ed

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

1 purchases

SpotOn Grading System Comic Ed

Subscriptions1
  • Unlimited grading for 1 year$14.991 Year
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 SpotOn Grading System Comic Ed free?
SpotOn Grading System Comic Ed is free to download, with in-app purchases available.
Is Card Centering Calculator free?
Card Centering Calculator is free to download, with in-app purchases available.
Which has better reviews, SpotOn Grading System Comic Ed or Card Centering Calculator?
Card Centering Calculator is rated higher. SpotOn Grading System Comic Ed averages 3.3 out of 5 from 24 ratings, while Card Centering Calculator averages 4.7 from 2.5K ratings.
Do SpotOn Grading System Comic Ed or Card Centering Calculator have ads?
Card Centering Calculator shows ads; SpotOn Grading System Comic Ed does not.
Which is updated more often, SpotOn Grading System Comic Ed or Card Centering Calculator?
SpotOn Grading System Comic Ed ships an update every 5 months, and Card Centering Calculator monthly. Most recently, SpotOn Grading System Comic Ed was updated on October 3, 2026 and Card Centering Calculator on October 19, 2026.

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