# ITD vs 성인의 수학

The clearest difference is in-app purchases: 성인의 수학 at none against ITD's 8. 성인의 수학 also leads on update cadence (weekly vs monthly) and device support (3 vs 1). ITD's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. ITD sells 8 in-app purchases, starting at $4.99 per month. 성인의 수학 asks for nothing beyond the download.

ITD ships an update monthly, 성인의 수학 weekly. The most recent releases landed on September 20, 2026 and September 6, 2026 respectively.

## The numbers

| Metric | ITD | 성인의 수학 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Weekly** |
| Size | 141 MB | 41 MB |
| Requires iOS | 18.1 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [BODA EDU. CO.,LTD](https://appshunter.io/developer/1754173267) | [Mijin Kim](https://appshunter.io/developer/1717382242) |

## What reviewers say

### ITD

[App page](https://appshunter.io/ios/app/itd-pomodoro-focus-timer/id6756837604)

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 한달 | $4.99 | per month |
| 일년 | $29.99 | per year |
| 별조각 20개 | $0.49 | one-time |
| 별조각 70개 | $1.99 | one-time |
| 별조각 150개 | $4.99 | one-time |
| 별조각 350개 | $9.99 | one-time |
| 별조각 800개 | $17.99 | one-time |
| 평생 집중 | $49.99 | one-time |


### 성인의 수학

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

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

**In-app purchases:** none


## Frequently asked questions

### Is ITD free?

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

### Is 성인의 수학 free?

성인의 수학 is free to download, with no in-app purchases.

### Do ITD or 성인의 수학 have ads?

성인의 수학 shows ads; ITD does not.

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

ITD ships an update monthly, and 성인의 수학 weekly. Most recently, ITD was updated on September 20, 2026 and 성인의 수학 on September 6, 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.*