# 성인의 수학 vs Sumday

성인의 수학 and Sumday are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 성인의 수학 sells 2 one-off in-app purchases and Sumday sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

성인의 수학 ships an update weekly, Sumday every 11 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 성인의 수학 | Sumday |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Weekly** | Every 11 days |
| Monetization | — | Free with in-app purchases |
| Size | 48 MB | 34 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mijin Kim](https://appshunter.io/developer/1717382242) | [TON CO., LTD.](https://appshunter.io/developer/6796677381) |

## What reviewers say

### 성인의 수학

[App page](https://appshunter.io/ios/app/id6782822659)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 힌트쿠폰 10개 | $1.99 | one-time |
| 광고 제거 | $3.99 | one-time |


### Sumday

[App page](https://appshunter.io/ios/app/sumday-mental-math-practice/id6802302480)

Sharpen your number sense with daily mental math exercises. This app offers quick arithmetic practice, practical math tricks, and progress tracking to improve your speed and accuracy in just five minutes a day.

**Highlights:** Daily arithmetic questions, Adaptive difficulty levels, Mental math technique cards, Progress tracking and reports, Streak tracking, Offline functionality

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sumday Premium | $3.99 | one-time |


## Frequently asked questions

### Is 성인의 수학 free?

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

### Is Sumday free?

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

### Do 성인의 수학 or Sumday have ads?

Both 성인의 수학 and Sumday show ads.

### Which is updated more often, 성인의 수학 or Sumday?

성인의 수학 ships an update weekly, and Sumday every 11 days. Most recently, 성인의 수학 was updated on October 25, 2026 and Sumday on October 29, 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.*