# Grade.IQ vs Centered Cardboard

The clearest difference is update cadence: Grade.IQ at every 4 days against Centered Cardboard's every 3 weeks. Grade.IQ also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Grade.IQ sells 3 in-app purchases, starting at $2.99 per month and Centered Cardboard sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Grade.IQ ships an update every 4 days, Centered Cardboard every 3 weeks. The most recent releases landed on November 9, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Grade.IQ | Centered Cardboard |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (64 ratings)](https://appshunter.io/ios/app/centered-cardboard/id6759780836/reviews)** |
| Number of ratings | — | **64** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 50 MB | 22 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MARCUS WILSON HUGHES](https://appshunter.io/developer/1877077258) | [Oak Labs Limited Liability Company](https://appshunter.io/developer/1880606503) |

## What reviewers say

### Grade.IQ

[App page](https://appshunter.io/ios/app/gradeiq/id6759155592)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Grade Curious | $2.99 | per month |
| Grade Enthusiast | $5.99 | per month |
| Grade Obsessed | $9.99 | per month |


### Centered Cardboard

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

This app assists trading card collectors in pre-grading their cards. It uses your device's camera and clear visual tools to assess centering, alignment, and corners, providing estimated grading scores based on industry standards. Save, export, and share your card assessments easily.

**Highlights:** Live centering feedback with color-coded ratios, Grading score estimates, Corner grading for all four corners, Tilted measuring for rotated borders, True distance measurements, Adjustable outline guides, Up to 100x zoom

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Centered Cardboard Pro | $9.99 | one-time |


## Frequently asked questions

### Is Grade.IQ free?

Grade.IQ is free to download, with in-app purchases available.

### Is Centered Cardboard free?

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

### Do Grade.IQ or Centered Cardboard have ads?

Neither Grade.IQ nor Centered Cardboard shows ads.

### Which is updated more often, Grade.IQ or Centered Cardboard?

Grade.IQ ships an update every 4 days, and Centered Cardboard every 3 weeks. Most recently, Grade.IQ was updated on November 9, 2026 and Centered Cardboard on November 11, 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.*