# Mental Math Speed Trainer vs フラッシュ暗算練習

The clearest difference is in-app purchases: フラッシュ暗算練習 at none against Mental Math Speed Trainer's 3. フラッシュ暗算練習 also leads on review sentiment (50% vs 18%) and device support (3 vs 1). On price, update cadence and ads there is nothing between them.

Both are free to download. Mental Math Speed Trainer sells 3 in-app purchases, starting at $2.99 per month. フラッシュ暗算練習 asks for nothing beyond the download.

Mental Math Speed Trainer ships an update weekly, フラッシュ暗算練習 every 9 days. The most recent releases landed on September 22, 2026 and August 15, 2026 respectively.

## The numbers

| Metric | Mental Math Speed Trainer | フラッシュ暗算練習 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (4 ratings)](https://appshunter.io/ios/app/mental-math-speed-trainer/id6476421167/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 17.6% of reviews | **50.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 9 days |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 28 MB |
| Requires iOS | 17.2 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI HASHIMOTO](https://appshunter.io/developer/1689527181) | [Katsuyuki Hayashi](https://appshunter.io/developer/1597263179) |

## What reviewers say

### Mental Math Speed Trainer

[App page](https://appshunter.io/ios/app/mental-math-speed-trainer/id6476421167)

Sharpen your mental math skills with this engaging app focused on addition. Customize card numbers and timing intervals for a personalized learning experience. Track your progress with visually stimulating graphics, suitable for all ages.

**Highlights:** Customizable card numbers, Adjustable timing intervals, Focus on addition, Progress tracking, Engaging visuals, User-friendly interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月間プラン | $2.99 | per month |
| 年間プラン | $19.99 | per year |
| Lifetime Premium | $39.99 | one-time |


### フラッシュ暗算練習

[App page](https://appshunter.io/ios/app/id6477322637)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math Speed Trainer free?

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

### Is フラッシュ暗算練習 free?

フラッシュ暗算練習 is free to download, with no in-app purchases.

### Do Mental Math Speed Trainer or フラッシュ暗算練習 have ads?

Both Mental Math Speed Trainer and フラッシュ暗算練習 show ads.

### Which is updated more often, Mental Math Speed Trainer or フラッシュ暗算練習?

Mental Math Speed Trainer ships an update weekly, and フラッシュ暗算練習 every 9 days. Most recently, Mental Math Speed Trainer was updated on September 22, 2026 and フラッシュ暗算練習 on August 15, 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.*