# Mental Math Trainer vs XClass by XIIID

The clearest difference is in-app purchases: XClass by XIIID at none against Mental Math Trainer's 9. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mental Math Trainer sells 7 in-app purchases, starting at $2.99 per month. XClass by XIIID asks for nothing beyond the download.

Mental Math Trainer ships an update fortnightly, XClass by XIIID every 9 days. The most recent releases landed on October 26, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Mental Math Trainer | XClass by XIIID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (233 ratings)](https://appshunter.io/ios/app/mental-math-trainer-puremath/id684305542/reviews)** | — |
| Number of ratings | **233** | — |
| Positive reviews | 57.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 50 MB | 66 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Stoyan Hristov](https://appshunter.io/developer/584595816) | [Kulucky Rangers Inc.](https://appshunter.io/developer/1594808743) |

## What reviewers say

### Mental Math Trainer

[App page](https://appshunter.io/ios/app/mental-math-trainer-puremath/id684305542)

Enhance your arithmetic abilities with this app. Practice addition, subtraction, multiplication, and division through engaging games and custom sessions. Track your progress and challenge friends to boost your mental math confidence and speed.

**Highlights:** Addition, subtraction, multiplication, division practice, Math Arcade mode with increasing difficulty, Customizable practice sessions, Memory training games (Find the Pairs), Progress tracking, Game Center integration for challenges

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Access | $2.99 | per month |
| Unlimited Access | $2.99 | per 7 days |
| Unlimited Access | $3.99 | per month |
| Unlimited Access | $9.99 | per year |
| Unlimited Access | $12.99 | per year |
| Unlimited Access | $14.99 | per year |
| Unlock Everything | $17.99 | one-time |

**What reviewers like**

- 🧠 Brain training and mental sharpness
- 👍 Useful for math skills improvement
- 🚀 Fast and easy to use
- ✅ Good for daily practice
- 💡 Gamifies math learning

**What reviewers complain about**

- 💸 Most features are paid/locked
- 💰 Deceptive free version
- 😩 Repetitive questions/levels
- 🐌 Slow animations
- 📱 UI can be improved (keypad style)

**Reported bugs**

- App crashes or doesn't open
- Purchases not unlocking features
- In-app purchase issues
- Timer continues when paused
- Drag response not registering input

**Requested features**

- Option to choose keypad style
- More difficult levels
- Infinite or custom exercise mode
- Dark mode support
- Landscape mode support


### XClass by XIIID

[App page](https://appshunter.io/ios/app/xclass-by-xiiid/id6777957719)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math Trainer free?

Mental Math Trainer is free to download, with in-app purchases available.

### Is XClass by XIIID free?

XClass by XIIID is free to download, with no in-app purchases.

### Do Mental Math Trainer or XClass by XIIID have ads?

Neither Mental Math Trainer nor XClass by XIIID shows ads.

### Which is updated more often, Mental Math Trainer or XClass by XIIID?

Mental Math Trainer ships an update fortnightly, and XClass by XIIID every 9 days. Most recently, Mental Math Trainer was updated on October 26, 2026 and XClass by XIIID 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.*