# Sum 12 vs mkZero

The clearest difference is update cadence: mkZero at every 5 weeks against Sum 12's every 3 months. mkZero also leads on iOS requirement (12.2 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Sum 12 sells 1 one-off in-app purchase and mkZero sells 9 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Sum 12 ships an update every 3 months, mkZero every 5 weeks. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Sum 12 | mkZero |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | **Every 5 weeks** |
| Size | 46 MB | 13 MB |
| Requires iOS | 18.0 | **12.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Vitalij Schaefer](https://appshunter.io/developer/393749449) | [GameJab OÜ](https://appshunter.io/developer/1831019149) |

## What reviewers say

### Sum 12

[App page](https://appshunter.io/ios/app/sum-12/id6738145230)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $5.99 | one-time |


### mkZero

[App page](https://appshunter.io/ios/app/mkzero-math-challenge/id6749543532)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads For 3 Days | $0.29 | one-time |
| 20 Lives | $0.99 | one-time |
| 50 Lives | $1.99 | one-time |
| 100 Lives | $3.99 | one-time |
| Remove Ads | $4.99 | one-time |
| 300 Lives | $9.99 | one-time |
| 500 Lives | $14.99 | one-time |
| 1,000 lives! | $24.99 | one-time |
| Infinite Lives | $99.99 | one-time |


## Frequently asked questions

### Is Sum 12 free?

Sum 12 is free to download, with in-app purchases available.

### Is mkZero free?

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

### Do Sum 12 or mkZero have ads?

Both Sum 12 and mkZero show ads.

### Which is updated more often, Sum 12 or mkZero?

Sum 12 ships an update every 3 months, and mkZero every 5 weeks. Most recently, Sum 12 was updated on September 8, 2026 and mkZero on September 20, 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.*