# Byeoldosa vs PSAT/NCS 기초연산 트레이닝

The clearest difference is in-app purchases: Byeoldosa at none against PSAT/NCS 기초연산 트레이닝's 2. PSAT/NCS 기초연산 트레이닝's advantage is update cadence (daily vs every 6 months) and iOS requirement (13.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. PSAT/NCS 기초연산 트레이닝 sells 2 in-app purchases, starting at $1.99 per month. Byeoldosa asks for nothing beyond the download.

Byeoldosa ships an update every 6 months, PSAT/NCS 기초연산 트레이닝 daily. The most recent releases landed on June 4, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Byeoldosa | PSAT/NCS 기초연산 트레이닝 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/byeoldosa-arithmetic-practice/id6443646489/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Daily** |
| Monetization | Free | — |
| Size | 10 MB | 77 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Hyekyung Jeong](https://appshunter.io/developer/1634743217) | [JONGHYEOK PARK](https://appshunter.io/developer/1838106188) |

## 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


### PSAT/NCS 기초연산 트레이닝

[App page](https://appshunter.io/ios/app/psatncs/id6752115080)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 광고제거 | $1.99 | per month |
| PREMIUM | $3.99 | per month |


## Frequently asked questions

### Is Byeoldosa free?

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

### Is PSAT/NCS 기초연산 트레이닝 free?

PSAT/NCS 기초연산 트레이닝 is free to download, with in-app purchases available.

### Do Byeoldosa or PSAT/NCS 기초연산 트레이닝 have ads?

Neither Byeoldosa nor PSAT/NCS 기초연산 트레이닝 shows ads.

### Which is updated more often, Byeoldosa or PSAT/NCS 기초연산 트레이닝?

Byeoldosa ships an update every 6 months, and PSAT/NCS 기초연산 트레이닝 daily. Most recently, Byeoldosa was updated on June 4, 2026 and PSAT/NCS 기초연산 트레이닝 on September 18, 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.*