# RemNum 〜 数字を暗記するだけのアプリ vs Mahjong Skill Builder

The clearest difference is in-app purchases: RemNum 〜 数字を暗記するだけのアプリ at none against Mahjong Skill Builder's 2. RemNum 〜 数字を暗記するだけのアプリ also leads on iOS requirement (12.0 vs 15.1). Mahjong Skill Builder's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Mahjong Skill Builder sells 2 in-app purchases, starting at $0.99 per month. RemNum 〜 数字を暗記するだけのアプリ asks for nothing beyond the download.

RemNum 〜 数字を暗記するだけのアプリ ships an update every 3 weeks, Mahjong Skill Builder every 4 days. The most recent releases landed on October 4, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | RemNum 〜 数字を暗記するだけのアプリ | Mahjong Skill Builder |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 48 MB | 42 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [yoshitomo ishii](https://appshunter.io/developer/1495140436) | [Keita Ide](https://appshunter.io/developer/1804599366) |

## What reviewers say

### RemNum 〜 数字を暗記するだけのアプリ

[App page](https://appshunter.io/ios/app/remnum/id6504561429)

**Features:** macOS Compatibility

**In-app purchases:** none


### Mahjong Skill Builder

[App page](https://appshunter.io/ios/app/mahjong-skill-builder/id6759558674)

Master Mahjong scoring with structured practice. Learn to identify yaku, calculate han and fu, and determine final scores through five progressive training modes. Track your progress and improve your game with realistic hands and quick, randomized sessions.

**Highlights:** Master Mahjong scoring, Learn yaku and han values, Calculate fu and final points, Five progressive training modes, Realistic hand scenarios, Progress tracking and feedback, Quick, randomized sessions

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Skill Builder Premium Monthly | $0.99 | per month |
| Skill Builder Premium Yearly | $9.99 | per year |


## Frequently asked questions

### Is RemNum 〜 数字を暗記するだけのアプリ free?

RemNum 〜 数字を暗記するだけのアプリ is free to download, with no in-app purchases.

### Is Mahjong Skill Builder free?

Mahjong Skill Builder is free to download, with in-app purchases available.

### Do RemNum 〜 数字を暗記するだけのアプリ or Mahjong Skill Builder have ads?

Neither RemNum 〜 数字を暗記するだけのアプリ nor Mahjong Skill Builder shows ads.

### Which is updated more often, RemNum 〜 数字を暗記するだけのアプリ or Mahjong Skill Builder?

RemNum 〜 数字を暗記するだけのアプリ ships an update every 3 weeks, and Mahjong Skill Builder every 4 days. Most recently, RemNum 〜 数字を暗記するだけのアプリ was updated on October 4, 2026 and Mahjong Skill Builder on October 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.*