# PrimeCalc vs Mental arithmetic quiz

The clearest difference is ads: Mental arithmetic quiz at none against PrimeCalc's shown. Mental arithmetic quiz also leads on update cadence (every 8 days vs every 5 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

PrimeCalc ships an update every 5 weeks, Mental arithmetic quiz every 8 days. The most recent releases landed on September 10, 2026 and May 17, 2026 respectively.

## The numbers

| Metric | PrimeCalc | Mental arithmetic quiz |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 8 days** |
| Size | 12 MB | 38 MB |
| Requires iOS | **12.0** | 12.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yutaka Nakao](https://appshunter.io/developer/1303008060) | [LiRen Sun](https://appshunter.io/developer/1649265349) |

## What reviewers say

### PrimeCalc

[App page](https://appshunter.io/ios/app/primecalc-modprime-factor/id1332239791)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental arithmetic quiz

[App page](https://appshunter.io/ios/app/mental-arithmetic-quiz/id6443785734)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PrimeCalc free?

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

### Is Mental arithmetic quiz free?

Mental arithmetic quiz is free to download, with no in-app purchases.

### Do PrimeCalc or Mental arithmetic quiz have ads?

PrimeCalc shows ads; Mental arithmetic quiz does not.

### Which is updated more often, PrimeCalc or Mental arithmetic quiz?

PrimeCalc ships an update every 5 weeks, and Mental arithmetic quiz every 8 days. Most recently, PrimeCalc was updated on September 10, 2026 and Mental arithmetic quiz on May 17, 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.*