Comparison

순공시간 vs Stackd

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

순공시간

This app helps you plan your study sessions and track focused learning time. It allows you to set daily subjects, create to-do lists, and use a timer that only records actual study time. Achieve your academic goals with a clean, minimalist interface designed for smooth study flow.

Highlights
  • Subject-specific study planning
  • Study task checklist
  • Automatic focus time recording
  • Daily cumulative study time tracking
  • D-Day setting for exams
  • Minimalist interface
Features
Read full description

공부 계획과 타이머, 그리고 집중. 순공시간은 공부의 흐름을 방해하지 않는 조용한 공부 루틴 앱입니다. 공부를 시작하기 전, 오늘의 과목을 정하고 각 과목별로 해야 할 공부를 적어보세요. 타이머를 실행하면 집중한 시간만 기록되고, 하루 공부가 자연스럽게 쌓이기 시작합니다. - 과목별 공부 계획 작성 - 공부 목록 체크 - 타이머로 순공시간 자동 기록 - 하루 누적 시간 확인 - 시험이나 목표일을 위한 D-Day 설정 - 이전 계획 가져오기 기능 - 깔끔하고 미니멀한 화면 구성 순공시간은 복잡한 기능 없이 공부 흐름만 부드럽게 이어주는 데 집중했어요. 수능, 자격증, 자율 학습까지 공부 루틴이 필요한 누구에게나 어울립니다. 오늘 공부, 지금 바로 순공시간으로 시작해보세요. 이용약관: https://yerin719.github.io/terms-and-privacy/study_log_terms_of_service.html

About

Stackd

Features
Read full description

This is a simple study timer app that allows you to record and manage your study time by subject. Simply measure your time with the timer and save it. You can also log sessions manually or add entries for past dates. You can record everything together, including subjects, study materials, pages, and notes. You can view the big picture of your studies by checking your subject balance with weekly graphs and reviewing your progress streaks on the calendar. No ads, no social media features, and no account registration required. All data is saved on your device, so there are no privacy concerns. Perfect for anyone who wants to focus on learning, from exam preparation to certifications and language studies. [Main Features] - 3 timer modes (Stopwatch, Countdown, Pomodoro) - Management of subjects, materials, pages, and notes - Weekly graphs to check subject balance (bar chart & donut chart) - Calendar to visualize study days with color-coding - Display of consecutive study days (streaks) - Daily study reminder - Backup and data export functions [Stackd Pro (One-time purchase)] - Monthly graphs and cumulative line graphs - Setting weekly goals and checking achievement rates - 9 color themes - Home screen and lock screen widgets

Screenshots

순공시간4 screens
Stackd4 screens

Verdict

The call

The clearest difference is update cadence: Stackd at fortnightly against 순공시간's every 2 months. 순공시간's advantage is iOS requirement (15.1 vs 18). On price, ads, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. 순공시간 sells 2 in-app purchases, starting at $1.99 per month and Stackd sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

순공시간 ships an update every 2 months, Stackd fortnightly. The most recent releases landed on October 5, 2026 and October 1, 2026 respectively.

Scorecard2 real differences · 6 level
순공시간 versus Stackd: the parameters behind the verdict, then further details
Parameter순공시간Stackd
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 2 monthsFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better18
Further details — not scored
Size34 MB3 MB
Age rating4+4+
Developeryerin leeNene Nakagawa

In-app purchases

2 purchases

순공시간

Subscriptions2
  • 순공시간 프리미엄 (월간 구독)$1.991 Month
  • PureFocus Premium (Yearly)$14.991 Year
1 purchases

Stackd

One-time1
  • Stackd Pro$1.99

Questions

Is 순공시간 free?
순공시간 is free to download, with in-app purchases available.
Is Stackd free?
Stackd is free to download, with in-app purchases available.
Do 순공시간 or Stackd have ads?
Neither 순공시간 nor Stackd shows ads.
Which is updated more often, 순공시간 or Stackd?
순공시간 ships an update every 2 months, and Stackd fortnightly. Most recently, 순공시간 was updated on October 5, 2026 and Stackd on October 1, 2026.

Other comparisons