GCU Taskon vs Sumbi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
GCU Taskon
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Taskon is an assignment, timetable, and academic planner for Gachon University students. Automatically import Cyber Campus assignments, track deadlines and submission status, organize your timetable, and review grades, academic calendar events, and graduation credit progress in one place. [Key Features] Automatic assignment sync Sign in with your portal account to import assignments, quizzes, and video lectures from your enrolled courses. Search by title, course, or note, and filter by course. Organized task tabs Sort your work into New, Upcoming, Past, and Completed tabs. See remaining time, due dates, and submission status at a glance. Quiz and submission tracking Check whether assignments and quizzes have been submitted, and keep completed work out of your active task list. Taskon now reads key Cyber Campus information even when the web language is Korean, English, Japanese, or Chinese. Timetable Build a timetable from Cyber Campus lecture information, including class times and rooms. Manual edits and deleted imported entries are preserved when you sync again. My tab Import academic information from the Gachon portal and view your GPA calculator, graduation GPA forecast, current academic year adjusted for leave of absence, academic calendar, and graduation credit requirements. Curriculum information is shown for students admitted in 2025 or later. Grade planning Calculate your current GPA and earned credits from imported grades, then estimate how many future credits you need to reach a target GPA. Personal tasks and notes Keep your own to-dos, like exam prep or offline homework, alongside school assignments, and add a note to any item. Widgets, Lock Screen, and Apple Watch See your nearest deadline and next class on Home Screen and Lock Screen widgets and Live Activities, and mark work done without opening the app. Apple Watch complications are supported too. iCloud sync and reminders Keep assignment status synced across iPhone, iPad, and Mac. Deadline reminders and background refresh help you stay on top of new work. [Demo] No Gachon University account? Sign in with ID: test / PW: test to try the app with sample data. Taskon is an independent app and is not affiliated with Gachon University.
Sumbi
This app encourages users to spend less time on their phones by gamifying digital detox. Users engage in timed "dives" away from their devices, earning virtual sea creatures based on their focus duration. It offers a peaceful, non-punitive approach to building healthier digital habits.
- Timed phone-free dives
- Unlock virtual sea creatures
- Personalized ocean environment
- Buddy dive feature
- Night sea creatures
- Diary-like dive log
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The longer you put your phone down, the deeper your life gets. Start the timer, set your phone down, and sea creatures come to your ocean. From exam prep to digital detox, dive with Sumbi. Sumbi is a study focus timer and digital detox app named after the "sumbisori," the whistling breath of Jeju haenyeo, Korea's legendary free-diving women. Start a dive when you want time away from your phone. While your phone rests, your ocean deepens, and sea creatures come to live in it. Who dives with Sumbi - Students who need a study timer for exams and deep focus - Anyone fighting phone addiction or doomscrolling - People who want to cut screen time and rebuild concentration - ADHD brains that need a gentle, visual reason to stay off the phone - Anyone who just wants to watch a calm ocean and breathe What makes Sumbi different 1. One dive = one focus session. Keep your phone down while the timer runs, and the dive succeeds. If you fail, nobody scolds you. 2. Your focus time becomes an ocean. Successful dives bring creatures from shallow water, deep water, even the abyss. 3. Collect and raise your sea creatures. The more you dive, the wider and deeper your ocean grows. 4. Gift creatures to your dive buddies. Focus is deeper together. 5. No ads, no noise. Sumbi never drags you back with notifications. Coming back is your choice. Study timer, pomodoro, or deep work Pick any length with the dial: a short pomodoro-style session or hours of exam prep. Every dive adds to your daily focus record. When haenyeo divers surface, they release a long whistling breath: "hooo-ee." Your day deserves a breath that deep. Have a good dive. Hoo-ee! Contact: sumbi@niceday.io
Screenshots
Verdict
The clearest difference is in-app purchases: GCU Taskon at none against Sumbi's 3. GCU Taskon also leads on device support (3 vs 1). Sumbi's advantage is iOS requirement (16.4 vs 26.0). On price, update cadence and ads 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. Sumbi sells 3 one-off in-app purchases. GCU Taskon asks for nothing beyond the download.
GCU Taskon ships an update every 4 days, Sumbi weekly. The most recent releases landed on November 9, 2026 and November 6, 2026 respectively.
| Parameter | GCU Taskon | Sumbi |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 4 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, Apple Watch — better | iPhone |
| Requires iOS | 26.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 16 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Shin Geonu | 나이스데이 |
In-app purchases
GCU Taskon
No in-app purchases
Sumbi
- Shallow Sea Creature$0.99
- Deep Sea Creature$1.99
- Abyssal Creature$2.99









