Sumbi Downloads & RevenueSumbi - Study Focus Timer · App Store
Sumbi - 공부 집중 타이머 & 디지털 디톡스
47 days old
Sumbi - Study Focus Timer is #77 in Productivity Free in South Korea and charting in 1 of 30 countries we track.
Updated 8 Nov 2026 · rankings refresh through the day
Developer나이스데이
CategoryProductivity
PriceFree
Released
Rating★ 5.0 (58)
Version1.2.1
Age rating4+
First seen by us
2 Oct 2026
2 Oct 2026Installs (est.)1k+ worldwide
Sumbi - Study Focus Timer update history & changes
Last change · 11 events since 22 Sep 2026Full timeline ↓⭐Ratings taking off in South Korea📦Updated to version 1.2.1📦Now updating weekly✏️Description updated✏️Renamed📈Entered the top 100🆕First spotted by AppInsider🆕Released on the App Store
Full timeline · 11 events
- 📦Sumbi - Study Focus Timer updated to version 1.2.1바다가 조금 더 잔잔해졌어요
· 내 바다와 해녀 꾸미기에서도 바다를 톡 누르면 물방울이 올라와요
· 안드로이드에서 화면을 오갈 때 끊기던 불편함을 없앴어요
· 자잘한 다듬기와 수정들 - 📦Sumbi - Study Focus Timer: now updating weekly4 updates in 30 days, after a quiet two months
- ✏️Sumbi - Study Focus Timer: description updated· KR
- ✏️Sumbi - Study Focus Timer: renamedSumbi - 집중 타이머 & 디지털 디톡스 → Sumbi - 공부 집중 타이머 & 디지털 디톡스 · KR
- 📦Sumbi - Study Focus Timer updated to version 1.2.0이제 함께 잠수해요
· 함께 잠수 : 버디와 함께 내려가요. 먼저 떠오르면 함께 올라오고, 끝까지 머물면 각자의 조개를 열어요
· 내 숨비 : 해녀의 잠수복 색을 고를 수 있어요
· 버디 연결과 선물, 이제 링크로도 보내요
· 숨고르기가 설정으로 이사했어요. 심해에서도 숨을 골라요
· 기본 잠수가 20분이 되고, 바다를 확대·축소하며 둘러볼 수 있어요
· 바다에 새 음악이 흘러요.(Sunlight Through Water)
· 자잘한 다듬기와 수정들… more - 📦Sumbi - Study Focus Timer updated to version 1.1.1· Text now keeps the same size regardless of your device's text size setting, so screens stay tidy
· Minor fixes - 📈Sumbi - Study Focus Timer entered the top 100Top Free · Productivity · KR
- 🆕Sumbi - Study Focus Timer first spotted by AppInsider#71 in Top Free · Productivity · South Korea
- 📦Sumbi - Study Focus Timer version 1.1.0You can now gift creatures from My Ocean.
- 🆕Sumbi - Study Focus Timer released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
5.0 ★
58 ratings
Measured
Best rank now
#77
Productivity FreeMeasured
New ratings a week
10
▲ +158% vs the 2 weeks before
Measured
Sumbi - Study Focus Timer on the App Store
App details
App ID
6802502926
Publisher
niceday Co.,Ltd.
On the store since
Sep 2026
Under a year
Minimum OS
iOS 16.4+
iPhone 8 and later
Devices
iPhone · iPad
Content rating
4+
Languages
3
EN JA KO
Size
99 MB
Also listed in
Health & Fitness
Sumbi - Study Focus Timer downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. App Store downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where Sumbi - Study Focus Timer's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
Retention · share of new users still active
Day 1
Day 7
Day 30
Time spent · per daily user
Average time spent Pro
min a day
Sessions a day Pro
Time per session Pro
min
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| South Korea | ProductivityFree | #77 |
Apps near Sumbi - Study Focus Timer on the chart
Productivity Free, around #77.
Ratings
App Store, worldwide.
Rating
5.0 ★
58 ratings
Measured
Ratings
58
Measured
Review momentum
ⓘ How we measure thisNew ratings a week
10
▲ +158% vs the 2 weeks before
Recent ratings
5.0★
vs 5.0★ lifetime
Review momentum
88/100
faster than 81% of Productivity apps
Review momentum (0-100) blends how fast the app collects ratings compared with other apps in its category (60%), whether that pace is speeding up (25%) and what recent raters give it (15%; recent stars well below lifetime pull it down). Ratings counts are read daily. A jump usually means a launch, a feature, ads or a new review prompt.
About Sumbi - Study Focus Timer
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: [email protected]
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: [email protected]
Latest updates
1.2.1
바다가 조금 더 잔잔해졌어요
· 내 바다와 해녀 꾸미기에서도 바다를 톡 누르면 물방울이 올라와요
· 안드로이드에서 화면을 오갈 때 끊기던 불편함을 없앴어요
· 자잘한 다듬기와 수정들
1.2.0
이제 함께 잠수해요
· 함께 잠수 : 버디와 함께 내려가요. 먼저 떠오르면 함께 올라오고, 끝까지 머물면 각자의 조개를 열어요
· 내 숨비 : 해녀의 잠수복 색을 고를 수 있어요
· 버디 연결과 선물, 이제 링크로도 보내요
· 숨고르기가 설정으로 이사했어요. 심해에서도 숨을 골라요
· 기본 잠수가 20분이 되고, 바다를 확대·축소하며 둘러볼 수 있어요
· 바다에 새 음악이 흘러요.(Sunlight Through Water)
· 자잘한 다듬기와 수정들
1.1.1
· Text now keeps the same size regardless of your device's text size setting, so screens stay tidy
· Minor fixes
Store changes
What Sumbi - Study Focus Timer changed on its store page: name, icon, screenshots, price, size, languages, requirements.
Description updated
Renamed
Sumbi - 집중 타이머 & 디지털 디톡스 → Sumbi - 공부 집중 타이머 & 디지털 디톡스
