# BoostUp vs Chaipang Subtraction

The clearest difference is in-app purchases: BoostUp at none against Chaipang Subtraction's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Chaipang Subtraction sells 1 one-off in-app purchase. BoostUp asks for nothing beyond the download.

BoostUp ships an update every 4 months, Chaipang Subtraction every 3 months. The most recent releases landed on October 5, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | BoostUp | Chaipang Subtraction |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Size | 1 MB | 136 MB |
| Requires iOS | **12.2** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Epublic CO.,LTD](https://appshunter.io/developer/1171279840) | [Wecref Co., Ltd.](https://appshunter.io/developer/1570555584) |

## What reviewers say

### BoostUp

[App page](https://appshunter.io/ios/app/boostup/id1540192909)

**Features:** macOS Compatibility

**In-app purchases:** none


### Chaipang Subtraction

[App page](https://appshunter.io/ios/app/chaipang-subtraction/id1614401871)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 차이팡 뺄셈 광고제거 | $2.99 | one-time |


## Frequently asked questions

### Is BoostUp free?

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

### Is Chaipang Subtraction free?

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

### Do BoostUp or Chaipang Subtraction have ads?

Neither BoostUp nor Chaipang Subtraction shows ads.

### Which is updated more often, BoostUp or Chaipang Subtraction?

BoostUp ships an update every 4 months, and Chaipang Subtraction every 3 months. Most recently, BoostUp was updated on October 5, 2026 and Chaipang Subtraction on October 7, 2026.

---

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