# けいさん道場 vs Mental Math

The clearest difference is in-app purchases: けいさん道場 at none against Mental Math's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mental Math sells 3 in-app purchases, starting at $3.99 per month. けいさん道場 asks for nothing beyond the download.

けいさん道場 ships an update every 10 days, Mental Math weekly. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | けいさん道場 | Mental Math |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (3 ratings)](https://appshunter.io/ios/app/mental-math-calmenta/id6790559635/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | — | Freemium |
| Size | 9 MB | 73 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [SANWA Inc.](https://appshunter.io/developer/1878028373) | [HelloProg](https://appshunter.io/developer/1866892083) |

## What reviewers say

### けいさん道場

[App page](https://appshunter.io/ios/app/id6760689144)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-calmenta/id6790559635)

This app transforms mental math practice into an engaging game. Solve calculations by writing answers directly on the screen, track progress with badges and records, and enjoy a child-friendly, ad-free experience with parental controls.

**Highlights:** Finger-based answer input, Timed calculation challenges, Multiple math operations, Progress tracking with badges, Parental controls and profiles, Ad-free and no data collection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |
| Abonnement annuel | $9.99 | per year |
| Premium à vie | $22.99 | one-time |


## Frequently asked questions

### Is けいさん道場 free?

けいさん道場 is free to download, with no in-app purchases.

### Is Mental Math free?

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

### Do けいさん道場 or Mental Math have ads?

Neither けいさん道場 nor Mental Math shows ads.

### Which is updated more often, けいさん道場 or Mental Math?

けいさん道場 ships an update every 10 days, and Mental Math weekly. Most recently, けいさん道場 was updated on October 11, 2026 and Mental Math on October 24, 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.*