# Number Sum Up vs Math Defender

The clearest difference is in-app purchases: Math Defender at none against Number Sum Up's 1. Number Sum Up's advantage is ads (none vs shown) and update cadence (every 3 days vs weekly). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Number Sum Up sells 1 one-off in-app purchase. Math Defender asks for nothing beyond the download.

Number Sum Up ships an update every 3 days, Math Defender weekly. Both last shipped on October 13, 2026.

## The numbers

| Metric | Number Sum Up | Math Defender |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (19 ratings)](https://appshunter.io/ios/app/number-sum-up-quick-math/id6502631525/reviews)** | — |
| Number of ratings | **19** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | Free with in-app purchases | — |
| Size | 197 MB | 143 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ALICE GAMES](https://appshunter.io/developer/1726187276) | [LUN SHIH WANG](https://appshunter.io/developer/1853564316) |

## What reviewers say

### Number Sum Up

[App page](https://appshunter.io/ios/app/number-sum-up-quick-math/id6502631525)

Solve number puzzles by circling and erasing digits to make rows and columns add up to target sums. This game offers a clean design and varying difficulty levels to sharpen your mental math skills.

**Highlights:** Circle and erase numbers, Solve row and column sum puzzles, Multiple difficulty levels, Varying board sizes, Hint system, Clean and simple design

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


### Math Defender

[App page](https://appshunter.io/ios/app/math-defender-magic-defense/id6758081512)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Number Sum Up free?

Number Sum Up is free to download, with in-app purchases available.

### Is Math Defender free?

Math Defender is free to download, with no in-app purchases.

### Do Number Sum Up or Math Defender have ads?

Math Defender shows ads; Number Sum Up does not.

### Which is updated more often, Number Sum Up or Math Defender?

Number Sum Up ships an update every 3 days, and Math Defender weekly. Most recently, Number Sum Up was updated on October 13, 2026 and Math Defender on October 13, 2026.

---

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