# Plus Minus Math SD vs Mental Calculation

The clearest difference is update cadence: Mental Calculation at every 3 months against Plus Minus Math SD's every 18 months. On price, ads, 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.

Plus Minus Math SD ships an update every 18 months, Mental Calculation every 3 months. The most recent releases landed on March 4, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Plus Minus Math SD | Mental Calculation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (22 ratings)](https://appshunter.io/ios/app/mental-calculation-mathybot/id1468698300/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | — | 81.3% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 18 months | **Every 3 months** |
| Monetization | — | Ad-supported |
| Size | 24 MB | 14 MB |
| Requires iOS | **12.0** | 12.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andela ICT](https://appshunter.io/developer/342734534) | [Jaime C. Carriedo](https://appshunter.io/developer/785723408) |

## What reviewers say

### Plus Minus Math SD

[App page](https://appshunter.io/ios/app/plus-minus-math-sd/id1031009964)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Calculation

[App page](https://appshunter.io/ios/app/mental-calculation-mathybot/id1468698300)

Practice basic arithmetic operations like addition, subtraction, multiplication, and division. Engage in challenges against the AI or another player, choosing difficulty levels to improve your math skills with fun.

**Highlights:** Addition and subtraction practice, Times tables and division, Challenge MathyBot mode, Two-player mode, Selectable difficulty levels, Customizable operations

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

**In-app purchases:** none


## Frequently asked questions

### Is Plus Minus Math SD free?

Plus Minus Math SD is free to download, with no in-app purchases.

### Is Mental Calculation free?

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

### Do Plus Minus Math SD or Mental Calculation have ads?

Both Plus Minus Math SD and Mental Calculation show ads.

### Which is updated more often, Plus Minus Math SD or Mental Calculation?

Plus Minus Math SD ships an update every 18 months, and Mental Calculation every 3 months. Most recently, Plus Minus Math SD was updated on March 4, 2026 and Mental Calculation on September 21, 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.*