# Byeoldosa vs 두칭

The clearest difference is in-app purchases: Byeoldosa at none against 두칭's 4. 두칭's advantage is update cadence (every 11 days vs every 6 months) and iOS requirement (14.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. 두칭 sells 4 in-app purchases, starting at $5.99 per month. Byeoldosa asks for nothing beyond the download.

Byeoldosa ships an update every 6 months, 두칭 every 11 days. The most recent releases landed on June 4, 2026 and August 1, 2026 respectively.

## The numbers

| Metric | Byeoldosa | 두칭 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/byeoldosa-arithmetic-practice/id6443646489/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 11 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 10 MB | 5 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hyekyung Jeong](https://appshunter.io/developer/1634743217) | [Active Senior Lab Co., Ltd.](https://appshunter.io/developer/1706787104) |

## What reviewers say

### Byeoldosa

[App page](https://appshunter.io/ios/app/byeoldosa-arithmetic-practice/id6443646489)

This app offers step-by-step practice for basic arithmetic operations like addition, subtraction, multiplication, and division. It features levels organized by difficulty, from single-digit to three-digit numbers, with a vertical calculation mode that mimics writing sums on paper. Progress is automatically saved and visualized in charts to track speed and accuracy improvements.

**Highlights:** Step-by-step arithmetic practice, Addition, subtraction, multiplication, division, Difficulty levels, Vertical (column) calculation mode, Automatic practice set saving, Progress charts for speed and accuracy

**Features:** macOS Compatibility

**In-app purchases:** none


### 두칭

[App page](https://appshunter.io/ios/app/id6444273112)

Engage in fun brain games designed to enhance cognitive abilities and maintain brain health. This training program, based on research from the World Brain Society and official dementia screening tools, offers diverse quizzes and games across seven cognitive areas.

**Highlights:** Cognitive ability enhancement, Brain health management, Diverse quiz and game formats, Based on scientific research, Covers 7 cognitive areas, Improves memory and concentration

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 정기구독 훈련 | $5.99 | per month |
| 30일 훈련 | $5.99 | one-time |
| 90일 훈련 | $12.99 | one-time |
| 365일 훈련 | $39.99 | one-time |


## Frequently asked questions

### Is Byeoldosa free?

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

### Is 두칭 free?

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

### Do Byeoldosa or 두칭 have ads?

Neither Byeoldosa nor 두칭 shows ads.

### Which is updated more often, Byeoldosa or 두칭?

Byeoldosa ships an update every 6 months, and 두칭 every 11 days. Most recently, Byeoldosa was updated on June 4, 2026 and 두칭 on August 1, 2026.

---

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