# MathZombie! vs 脳内そろばん

The clearest difference is in-app purchases: MathZombie! at none against 脳内そろばん's 1. MathZombie! also leads on device support (3 vs 1) and iOS requirement (15.0 vs 17.0). 脳内そろばん's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. 脳内そろばん sells 1 one-off in-app purchase. MathZombie! asks for nothing beyond the download.

MathZombie! ships an update every 2 months, 脳内そろばん monthly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | MathZombie! | 脳内そろばん |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Monthly** |
| Monetization | Ad-supported | — |
| Size | 179 MB | 5 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [M kajimura](https://appshunter.io/developer/1138663828) | [Ryo Sato](https://appshunter.io/developer/1831657696) |

## What reviewers say

### MathZombie!

[App page](https://appshunter.io/ios/app/mathzombie/id1537760395)

Engage in a brain-training calculation game to defeat zombies with mental arithmetic. Solve addition, subtraction, and multiplication problems to progress through increasingly difficult stages and compete on global leaderboards. Practice makes perfect for faster calculations.

**Highlights:** Mental arithmetic training, Addition, subtraction, multiplication, Progressive difficulty levels, In-game coin collection, Global and net rankings, Bluetooth keyboard support

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

**In-app purchases:** none


### 脳内そろばん

[App page](https://appshunter.io/ios/app/id6790279857)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム | $3.99 | one-time |


## Frequently asked questions

### Is MathZombie! free?

MathZombie! is free to download, with no in-app purchases.

### Is 脳内そろばん free?

脳内そろばん is free to download, with in-app purchases available.

### Do MathZombie! or 脳内そろばん have ads?

MathZombie! shows ads; 脳内そろばん does not.

### Which is updated more often, MathZombie! or 脳内そろばん?

MathZombie! ships an update every 2 months, and 脳内そろばん monthly. Most recently, MathZombie! was updated on November 3, 2026 and 脳内そろばん on October 31, 2026.

---

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