Proof Authentication vs Card Centering Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Proof Authentication
Verify product authenticity instantly by scanning official security marks. Ensure your purchases are genuine with rapid and accurate authentication. Look for the Proof Security Mark on select consumer goods.
- Instant product authentication
- Scan Official Proof Security Marks
- High accuracy verification
- Fast results
- Supports selected consumer items
Read full descriptionHide full description
Proof allows you to authenticate the products you buy with unprecedented speed and accuracy. By simply holding the Proof App over any Official Proof Security Mark you will know within seconds that the product you have purchased is 100% authentic. Look for the Proof Security Mark on selected consumer items.
Card Centering Calculator
This app helps trading card collectors accurately measure card centering for professional grading. It offers automatic border detection with manual adjustments, clear measurement results, and the ability to compare potential grades across major companies. Save and manage your analyzed cards to stop guessing and start measuring.
- Accurate centering measurements
- Automatic border detection
- Manual guide adjustments
- Compare potential grades
- Save and manage analyzed cards
- Image import via camera or photos
Read full descriptionHide full description
Get accurate centering measurements for your trading cards quickly and easily. Ideal for collectors preparing cards for PSA, BGS, CGC, SGC, or TAG grading. - Easy image import (Camera or Photos). - Automatic border detection plus manual guide adjustments. - Clear Left/Right and Top/Bottom centering results. - Compare potential grades across major grading companies. - Save and manage your analyzed cards. Stop guessing, start measuring! Get Card Centering Calculator now. Privacy Policy: https://ccc.ardasen.com/privacy.html Terms of Use: https://ccc.ardasen.com/terms.html
Screenshots
Verdict
The clearest difference is in-app purchases: Proof Authentication at none against Card Centering Calculator's 2. Proof Authentication also leads on review sentiment (50% vs 33%). Card Centering Calculator's advantage is update cadence (every 2 weeks vs every 2 months) and ratings volume (58 vs 7). On price, rating and ads 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. Card Centering Calculator sells 2 in-app purchases, starting at $2.99 per 7 days. Proof Authentication asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.4 for Proof Authentication against 4.4 for Card Centering Calculator. That said, the two scores are not equally well evidenced: Card Centering Calculator has 58 ratings behind it against 7, so its average is the more settled of the two. Written reviews are what separate them: 50% of Proof Authentication's written reviews are positive against 33% of Card Centering Calculator's.
Proof Authentication ships an update every 2 months, Card Centering Calculator every 2 weeks. The most recent releases landed on October 11, 2026 and October 3, 2026 respectively.
| Parameter | Proof Authentication | Card Centering Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (7 ratings) | 4.4 (58 ratings) |
| Positive reviews | 50.0% of reviews — better | 33.3% of reviews |
| Number of ratings | 7 | 58 — better |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 75 MB | 18 MB |
| Age rating | 4+ | 4+ |
| Developer | Proof Authentication Corporation | Arda Sen |
Customer experience
Proof Authentication
Card Centering Calculator
In-app purchases
Proof Authentication
No in-app purchases
Card Centering Calculator
- Weekly Subscription3 Days trial$2.997 Days
- Yearly Subscription$19.991 Year
Questions
Is Proof Authentication free?
Is Card Centering Calculator free?
Which has better reviews, Proof Authentication or Card Centering Calculator?
Do Proof Authentication or Card Centering Calculator have ads?
Which is updated more often, Proof Authentication or Card Centering Calculator?
Other comparisons
