# Mental Math vs eスタジアム見守り通知

The clearest difference is in-app purchases: eスタジアム見守り通知 at none against Mental Math's 3. eスタジアム見守り通知 also leads on ads (none vs shown) and update cadence (daily vs every 8 days). On price there is nothing between them.

Both are free to download. Mental Math sells 3 in-app purchases, starting at $2.99 per month. eスタジアム見守り通知 asks for nothing beyond the download.

Mental Math ships an update every 8 days, eスタジアム見守り通知 daily. The most recent releases landed on October 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Mental Math | eスタジアム見守り通知 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (4 ratings)](https://appshunter.io/ios/app/mental-math-soroban-abacus/id6476421167/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 17.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 8 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 56 MB | 2 MB |
| Requires iOS | 17.2 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [TAKAYUKI HASHIMOTO](https://appshunter.io/developer/1689527181) | [株式会社ティー・エム・シー](https://appshunter.io/developer/1784865148) |

## What reviewers say

### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-soroban-abacus/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 |


### eスタジアム見守り通知

[App page](https://appshunter.io/ios/app/e/id6744515783)

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

**In-app purchases:** none


## Frequently asked questions

### Is Mental Math free?

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

### Is eスタジアム見守り通知 free?

eスタジアム見守り通知 is free to download, with no in-app purchases.

### Do Mental Math or eスタジアム見守り通知 have ads?

Mental Math shows ads; eスタジアム見守り通知 does not.

### Which is updated more often, Mental Math or eスタジアム見守り通知?

Mental Math ships an update every 8 days, and eスタジアム見守り通知 daily. Most recently, Mental Math was updated on October 9, 2026 and eスタジアム見守り通知 on September 23, 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.*