# Proof Authentication vs Centered Cardboard

The clearest difference is review sentiment: Centered Cardboard at 100% against Proof Authentication's 50%. Centered Cardboard also leads on rating (4.9 vs 4.4) and update cadence (monthly vs every 2 months). Proof Authentication's advantage is in-app purchases (none vs 1) and iOS requirement (14.4 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Centered Cardboard sells 1 one-off in-app purchase. Proof Authentication asks for nothing beyond the download.

Centered Cardboard holds the better App Store score, 4.9 against 4.4. Both are backed by a comparable volume of ratings — 7 and 28 respectively. Written reviews point the same way: 50% of Proof Authentication's written reviews are positive against 100% of Centered Cardboard's.

Proof Authentication ships an update every 2 months, Centered Cardboard monthly. The most recent releases landed on September 8, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Proof Authentication | Centered Cardboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/proof-authentication/id1589988080/reviews) | **[4.9 (28 ratings)](https://appshunter.io/ios/app/centered-cardboard/id6759780836/reviews)** |
| Number of ratings | 7 | **28** |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 76 MB | 7 MB |
| Requires iOS | **14.4** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Proof Authentication Corporation](https://appshunter.io/developer/1604240795) | [Oak Labs Limited Liability Company](https://appshunter.io/developer/1880606503) |

## 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

**In-app purchases:** none


### Centered Cardboard

[App page](https://appshunter.io/ios/app/centered-cardboard/id6759780836)

This app helps trading card collectors pre-grade their cards by analyzing centering and alignment. It uses your device's camera and visual tools to provide quick, consistent, and accurate feedback on card position and border spacing.

**Highlights:** Live centering feedback with color-coded indicators, Skewed measuring for rotated borders, Exact distances for border spacing, Gyro leveling crosshair, Outline guide overlays, Up to 100x zoom, Camera capture or photo import

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Centered Cardboard Pro | $4.99 | one-time |


## Frequently asked questions

### Is Proof Authentication free?

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

### Is Centered Cardboard free?

Centered Cardboard is free to download, with in-app purchases available.

### Which has better reviews, Proof Authentication or Centered Cardboard?

Centered Cardboard is rated higher. Proof Authentication averages 4.4 out of 5 from 7 ratings, while Centered Cardboard averages 4.9 from 28 ratings.

### Do Proof Authentication or Centered Cardboard have ads?

Neither Proof Authentication nor Centered Cardboard shows ads.

### Which is updated more often, Proof Authentication or Centered Cardboard?

Proof Authentication ships an update every 2 months, and Centered Cardboard monthly. Most recently, Proof Authentication was updated on September 8, 2026 and Centered Cardboard on September 15, 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.*