# Quick mental calculation vs CauseCats

The clearest difference is ads: CauseCats at none against Quick mental calculation's shown. CauseCats also leads on iOS requirement (8.0 vs 12.0). Quick mental calculation's advantage is update cadence (every 11 days vs every 6 months). On price, in-app purchases and device support there is nothing between them.

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

Quick mental calculation ships an update every 11 days, CauseCats every 6 months. The most recent releases landed on September 29, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Quick mental calculation | CauseCats |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 11 days** | Every 6 months |
| Size | 21 MB | 194 MB |
| Requires iOS | 12.0 | **8.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ERX](https://appshunter.io/developer/513941286) | [Tamalaki](https://appshunter.io/developer/1161836852) |

## What reviewers say

### Quick mental calculation

[App page](https://appshunter.io/ios/app/quick-mental-calculation/id841970890)

**Features:** macOS Compatibility

**In-app purchases:** none


### CauseCats

[App page](https://appshunter.io/ios/app/causecats/id1161836853)

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

**In-app purchases:** none


## Frequently asked questions

### Is Quick mental calculation free?

Quick mental calculation is free to download, with no in-app purchases.

### Is CauseCats free?

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

### Do Quick mental calculation or CauseCats have ads?

Quick mental calculation shows ads; CauseCats does not.

### Which is updated more often, Quick mental calculation or CauseCats?

Quick mental calculation ships an update every 11 days, and CauseCats every 6 months. Most recently, Quick mental calculation was updated on September 29, 2026 and CauseCats on October 6, 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.*