# Proof Authentication vs Centering Check

The clearest difference is review sentiment: Proof Authentication at 50% against Centering Check's 0%. Proof Authentication also leads on in-app purchases (none vs 3). Centering Check's advantage is update cadence (every 2 weeks vs every 2 months) and rating (4.7 vs 4.4). On price and ads there is nothing between them.

Both are free to download. Centering Check sells 3 in-app purchases, starting at $3.99 per month. Proof Authentication asks for nothing beyond the download.

Centering Check holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Centering Check has 54 ratings behind it against 7, so its average is the more settled of the two. Written reviews complicate that: 50% of Proof Authentication's written reviews are positive against 0% of Centering Check's, so the app with the better star average is not the one people write more warmly about.

Proof Authentication ships an update every 2 months, Centering Check every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Proof Authentication | Centering Check |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/proof-authentication/id1589988080/reviews) | **[4.7 (54 ratings)](https://appshunter.io/ios/app/centering-check-tcg-card-tool/id6760215858/reviews)** |
| Number of ratings | 7 | **54** |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 75 MB | 47 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Proof Authentication Corporation](https://appshunter.io/developer/1604240795) | [Giosue Castellano](https://appshunter.io/developer/1883290378) |

## What reviewers say

### Proof Authentication

[App page](https://appshunter.io/ios/app/proof-authentication/id1589988080)

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.

**Highlights:** Instant product authentication, Scan Official Proof Security Marks, High accuracy verification, Fast results, Supports selected consumer items

**Features:** Vision Pro support

**In-app purchases:** none


### Centering Check

[App page](https://appshunter.io/ios/app/centering-check-tcg-card-tool/id6760215858)

This tool uses AI to accurately measure the centering of trading cards from photos or screenshots. It provides instant grade estimates for major grading companies and allows for manual adjustments and sharing of results. Evaluate online listings and your own collection with confidence.

**Highlights:** AI-powered image correction for accurate centering, Instant grade estimates for PSA, BGS, CGC, TAG, Manual border adjustment for precise measurements, Editable history of all scanned cards, Front and back centering calculations, Shareable images with centering data, Grading standards reference guide

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Centering Check PRO | $3.99 | per month |
| Yearly Centering Check PRO | $39.99 | per year |
| Lifetime Subscription PRO | $99.99 | one-time |


## Frequently asked questions

### Is Proof Authentication free?

Proof Authentication is free to download, with no in-app purchases.

### Is Centering Check free?

Centering Check is free to download, with in-app purchases available.

### Which has better reviews, Proof Authentication or Centering Check?

Centering Check is rated higher. Proof Authentication averages 4.4 out of 5 from 7 ratings, while Centering Check averages 4.7 from 54 ratings.

### Do Proof Authentication or Centering Check have ads?

Neither Proof Authentication nor Centering Check shows ads.

### Which is updated more often, Proof Authentication or Centering Check?

Proof Authentication ships an update every 2 months, and Centering Check every 2 weeks. Most recently, Proof Authentication was updated on October 24, 2026 and Centering Check on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*