# Mental Math vs NihongoMon

The clearest difference is rating: NihongoMon at 5.0 against Mental Math's 3.7. NihongoMon also leads on review sentiment (100% vs 63%) and update cadence (every 10 days vs every 5 weeks). Mental Math's advantage is ratings volume (19 vs 1) and iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Mental Math sells 3 in-app purchases, starting at $0.99 per month and NihongoMon sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

NihongoMon holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Mental Math has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 63% of Mental Math's written reviews are positive against 100% of NihongoMon's.

Mental Math ships an update every 5 weeks, NihongoMon every 10 days. The most recent releases landed on October 5, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Mental Math | NihongoMon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (19 ratings)](https://appshunter.io/ios/app/mental-math-arithmetic-games/id1628058449/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/nihongomon/id6760927473/reviews)** |
| Number of ratings | **19** | 1 |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 91 MB | 253 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Mehul Mistri](https://appshunter.io/developer/1628058451) | [Coty Kovach](https://appshunter.io/developer/1886868712) |

## What reviewers say

### Mental Math

[App page](https://appshunter.io/ios/app/mental-math-arithmetic-games/id1628058449)

This app teaches children arithmetic and calculation skills using an abacus and mental math techniques. It offers fun quizzes and practice problems to improve cognitive performance and mathematical ability.

**Highlights:** Abacus learning, Mental calculation techniques, Vedic math tricks, Addition, subtraction, multiplication, division, Quiz-based learning, Progress monitoring

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Mental Math Premium | $0.99 | per month |
| Mental Math Premium | $1.99 | per 3 months |
| Mental Math Premium | $6.99 | per year |


### NihongoMon

[App page](https://appshunter.io/ios/app/nihongomon/id6760927473)

Learn Japanese vocabulary and characters by training with cute monsters. Level up your skills, discover new monsters, and analyze your progress with detailed stats. Master the language to collect them all.

**Highlights:** Monster-themed learning, Virtual flashcards, Interactive quizzes, Skill leveling system, Progress analysis, Vocabulary and character mastery

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $29.99 | per year |


## Frequently asked questions

### Is Mental Math free?

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

### Is NihongoMon free?

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

### Which has better reviews, Mental Math or NihongoMon?

NihongoMon is rated higher. Mental Math averages 3.7 out of 5 from 19 ratings, while NihongoMon averages 5.0 from 1 ratings.

### Do Mental Math or NihongoMon have ads?

Neither Mental Math nor NihongoMon shows ads.

### Which is updated more often, Mental Math or NihongoMon?

Mental Math ships an update every 5 weeks, and NihongoMon every 10 days. Most recently, Mental Math was updated on October 5, 2026 and NihongoMon on September 12, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*