Byeoldosa vs PSAT/NCS 기초연산 트레이닝
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Byeoldosa
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.
- 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
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Byeoldosa is an arithmetic practice app for working through addition, subtraction, multiplication, and division step by step. • Levels are organised by difficulty, so you can start from the basics and move on to more advanced problems at your own pace. • Problems range from single-digit to three-digit numbers, with stages that change depending on whether carrying or borrowing is involved. • In vertical (column) calculation mode, you can follow each column one box at a time, much like writing out the sum on paper. • Every practice set is saved automatically, and your scores and time spent are shown in simple charts, so you can see how your speed and accuracy change as you keep practising. It’s a good fit for students who want to strengthen their arithmetic, for anyone who’d like a bit of mental exercise, or for those moments when you just feel like doing a few number problems. Whenever you feel like practising numbers, just open Byeoldosa.
PSAT/NCS 기초연산 트레이닝
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PSAT·NCS 시험을 체계적으로 준비하는 학습 앱입니다. 기초연산부터 실제 기출문제까지, 자료해석·응용수리 실력을 단계별로 끌어올리세요. 기초연산 트레이닝 - 16가지 문제 유형 (사칙연산, 비율, 백분율, 분수 비교, 수열, 평균 등) - 단계별 난이도로 약한 유형을 집중 연습 - 매 세션 새로 생성되는 문제로 암산·계산력 향상 기출문제 풀이 - PSAT·NCS 기출문제를 앱에서 바로 풀이 - 실제 시험과 유사한 풀이 환경 - 문제별 상세 해설 제공 성과 분석 - 정답률 추이와 유형별 실력 분석 - 강점·약점 진단으로 학습 방향 제시 - 오답노트, 학습 연속 기록, 일일 목표 관리 태블릿·펜 지원 - 태블릿과 펜으로 직접 필기하며 풀이 이런 분께 추천합니다 - 5급·7급 공무원, 민경채 PSAT 준비생 - NCS 수리능력·자료해석 대비 취업 준비생 - 수리·계산 속도를 단기간에 올리고 싶은 분 구독 안내 - 기초연산 학습과 성과 분석은 무료로 이용할 수 있습니다. - 광고 제거 (자동 갱신 구독): ₩2,900 / 월 — 모든 화면에서 광고 없이 학습 - PREMIUM (자동 갱신 구독): ₩4,900 / 월 — 광고 제거에 더해 전체 기출문제 풀이와 프리미엄 해설 제공 - 구독은 월 단위로 자동 갱신되며, 현재 기간 종료 24시간 전까지 해지하지 않으면 자동으로 갱신됩니다. 구매 후 기기의 App Store 계정 설정에서 언제든 해지할 수 있습니다. 지금 시작해 공무원·취업 시험 수리영역을 차근차근 정복하세요. 이용약관(Terms of Use): https://psat-practice.netlify.app/terms.html 개인정보 처리방침(Privacy Policy): https://psat-practice.netlify.app/privacy-policy.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Byeoldosa | PSAT/NCS 기초연산 트레이닝 |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 months | Daily — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 77 MB |
| Age rating | 4+ | 4+ |
| Developer | Hyekyung Jeong | JONGHYEOK PARK |
In-app purchases
Byeoldosa
No in-app purchases
PSAT/NCS 기초연산 트레이닝
- 광고제거$1.991 Month
- PREMIUM$3.991 Month









