KKUK - Lock Screen Habits
Not in any tracked top chart right now.
Updated 22 Oct 2026 · rankings refresh through the day
DeveloperSangcheol Kim
CategoryProductivity
PriceFree
Released
Rating★ 5.0 (2)
Version1.7.1
Age rating4+
First seen by us
21 Oct 2026
Rating
5.0 ★
2 ratings
Measured
KKUK - Lock Screen Habits on the App Store
App details
App ID
6797384948
Publisher
Sangcheol Kim
On the store since
Aug 2026
Under a year
Minimum OS
iOS 18.0+
iPhone XS and later
Devices
iPhone · iPad · Watch
Content rating
4+
Languages
3
EN JA KO
Size
86 MB
Also listed in
Lifestyle
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
5.0 ★
2 ratings
Measured
Ratings
2
Measured
About KKUK - Lock Screen Habits
A to-do list erases what you finish. KKUK does the opposite — every day you follow through leaves one more stamp.
Press one stamp today. Then watch them stack up on the calendar.
■ Press it without opening the app
Open the app once and today's board appears on the Lock Screen and in the Dynamic Island. For a while after that you can press a stamp right there, without going back to the app. You can also press one from a Home Screen widget.
■ A press, not a tap
One quick tap won't do it. Hold your finger until the ink fills all the way, and the stamp lands. Slide your finger aside to cancel a press you didn't mean.
■ Make your own stamp
Build a stamp from 16 colors and an emoji. Which weekdays, how many times a day, which group it belongs to, and when it should remind you — set all of it per stamp.
■ See what you've kept
· Calendar — every stamp you pressed this month on a single board.
· Journal — leave a note and a photo beside the stamp.
· Report — see how well you kept up by week, by month, and by year. The period you're looking at can be exported as a CSV file.
· Monthly review — look back on the month that just ended.
■ Seven Home Screen widgets
Today's Stamps · Recent check-ins · Calendar · Weekly report · Monthly report · Group weekly · Large calendar. Pick any size and keep it on your Home Screen.
■ Make it yours
Twenty bundled typefaces — four drawn for Latin text, sixteen Korean. Light, dark, or follow your device. Portrait only.
■ Free to use
3 stamps, 3 groups, the last 30 days of records, this week's and this month's report, and the Today's Stamps widget. Watch a rewarded ad all the way through to add one more stamp, and the slot you earned stays yours.
■ KKUK Premium unlocks
· Unlimited stamps and groups
· Every record, including anything older than 30 days
· Past reports and past monthly reviews
· All seven widgets
· iCloud sync to continue on another device
· No ads
■ Subscription details
· KKUK Premium Monthly — $1.99 / month
· KKUK Premium Yearly — $12.99 / year
Subscriptions renew automatically. Unless canceled at least 24 hours before the current period ends, a subscription renews at the same price, and payment is charged to your Apple Account at confirmation of purchase. You can manage or cancel subscriptions in Settings > Apple Account > Subscriptions on your device.
Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy https://kkuk-app.web.app/en/privacy/
■ Your records stay on your device
Stamps, notes, and photos are stored on your device. There is no account and no sign-in. iCloud sync is off by default, and when you turn it on, records are copied only to your own private iCloud database. The developer cannot read them and does not keep them on a separate server.
Press one stamp today. Then watch them stack up on the calendar.
■ Press it without opening the app
Open the app once and today's board appears on the Lock Screen and in the Dynamic Island. For a while after that you can press a stamp right there, without going back to the app. You can also press one from a Home Screen widget.
■ A press, not a tap
One quick tap won't do it. Hold your finger until the ink fills all the way, and the stamp lands. Slide your finger aside to cancel a press you didn't mean.
■ Make your own stamp
Build a stamp from 16 colors and an emoji. Which weekdays, how many times a day, which group it belongs to, and when it should remind you — set all of it per stamp.
■ See what you've kept
· Calendar — every stamp you pressed this month on a single board.
· Journal — leave a note and a photo beside the stamp.
· Report — see how well you kept up by week, by month, and by year. The period you're looking at can be exported as a CSV file.
· Monthly review — look back on the month that just ended.
■ Seven Home Screen widgets
Today's Stamps · Recent check-ins · Calendar · Weekly report · Monthly report · Group weekly · Large calendar. Pick any size and keep it on your Home Screen.
■ Make it yours
Twenty bundled typefaces — four drawn for Latin text, sixteen Korean. Light, dark, or follow your device. Portrait only.
■ Free to use
3 stamps, 3 groups, the last 30 days of records, this week's and this month's report, and the Today's Stamps widget. Watch a rewarded ad all the way through to add one more stamp, and the slot you earned stays yours.
■ KKUK Premium unlocks
· Unlimited stamps and groups
· Every record, including anything older than 30 days
· Past reports and past monthly reviews
· All seven widgets
· iCloud sync to continue on another device
· No ads
■ Subscription details
· KKUK Premium Monthly — $1.99 / month
· KKUK Premium Yearly — $12.99 / year
Subscriptions renew automatically. Unless canceled at least 24 hours before the current period ends, a subscription renews at the same price, and payment is charged to your Apple Account at confirmation of purchase. You can manage or cancel subscriptions in Settings > Apple Account > Subscriptions on your device.
Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy https://kkuk-app.web.app/en/privacy/
■ Your records stay on your device
Stamps, notes, and photos are stored on your device. There is no account and no sign-in. iCloud sync is off by default, and when you turn it on, records are copied only to your own private iCloud database. The developer cannot read them and does not keep them on a separate server.
Latest updates
1.7.1
■ A bigger Journal box
The text box in Write Journal is taller now, so you can see more of what you're writing at a glance.