# Mental Arithmetic Helper vs LucidGym

The clearest difference is ads: LucidGym at none against Mental Arithmetic Helper's shown. LucidGym also leads on iOS requirement (13.0 vs 15.8.3). On price, update cadence, 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.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Mental Arithmetic Helper | LucidGym |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | Fortnightly |
| Size | 37 MB | 21 MB |
| Requires iOS | 15.8.3 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) | [DIAMOND WHEEL LIMITED](https://appshunter.io/developer/1702831240) |

## What reviewers say

### Mental Arithmetic Helper

[App page](https://appshunter.io/ios/app/mental-arithmetic-helper/id6502036493)

**Features:** macOS Compatibility

**In-app purchases:** none


### LucidGym

[App page](https://appshunter.io/ios/app/lucidgym/id6793425330)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Arithmetic Helper free?

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

### Is LucidGym free?

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

### Do Mental Arithmetic Helper or LucidGym have ads?

Mental Arithmetic Helper shows ads; LucidGym does not.

### Which is updated more often, Mental Arithmetic Helper or LucidGym?

Mental Arithmetic Helper ships an update fortnightly, and LucidGym fortnightly. Most recently, Mental Arithmetic Helper was updated on October 11, 2026 and LucidGym on October 7, 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.*