# Number Master vs Card Centering Calculator Pro

The clearest difference is in-app purchases: Number Master at none against Card Centering Calculator Pro's 3. Number Master also leads on update cadence (every 9 days vs every 7 months). Card Centering Calculator Pro's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Card Centering Calculator Pro sells 3 in-app purchases, starting at $11.99 per year. Number Master asks for nothing beyond the download.

Number Master ships an update every 9 days, Card Centering Calculator Pro every 7 months. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Number Master | Card Centering Calculator Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/card-centering-calculator-pro/id6760994831/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 9 days** | Every 7 months |
| Monetization | — | Free with in-app purchases |
| Size | 25 MB | 53 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | +4 |
| Developer | [CometStudio(KR)](https://appshunter.io/developer/1329844522) | [Joseph Stein](https://appshunter.io/developer/535382667) |

## What reviewers say

### Number Master

[App page](https://appshunter.io/ios/app/number-master/id1570770231)

**Features:** macOS Compatibility

**In-app purchases:** none


### Card Centering Calculator Pro

[App page](https://appshunter.io/ios/app/card-centering-calculator-pro/id6760994831)

This tool helps collectors accurately measure the centering of trading cards and sports cards. It provides precise measurements and compares potential grades from major grading companies, aiding in informed decisions before professional submission.

**Highlights:** Camera and manual measurement tools, Precise centering ratio calculation, Grade comparisons across major companies, Front and back side grading, Built-in grading standards reference, Compatible with all card types

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly | $11.99 | per year |
| Yearly | $19.99 | per year |
| Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is Number Master free?

Number Master is free to download, with no in-app purchases.

### Is Card Centering Calculator Pro free?

Card Centering Calculator Pro is free to download, with in-app purchases available.

### Do Number Master or Card Centering Calculator Pro have ads?

Number Master shows ads; Card Centering Calculator Pro does not.

### Which is updated more often, Number Master or Card Centering Calculator Pro?

Number Master ships an update every 9 days, and Card Centering Calculator Pro every 7 months. Most recently, Number Master was updated on November 3, 2026 and Card Centering Calculator Pro on November 2, 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.*