KKUK - Lock Screen Habits
Stamp it, keep it
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
■ We've improved the availability of small bugs and apps.
■ Pick a widget color from the widget
Touch and hold the Recent check-ins widget on the Home Screen, open Edit Widget, and pick one of 16 colors. Each widget can keep its own, and leaving it alone follows the color in app settings as before.
The developer, Sangcheol Kim, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Sangcheol Kim
- Size
- 82.4 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English and Korean
- Age Rating
4+
- 4+
- Contains
Advertising
- In-App Purchases
Yes
- KKUK Premium Yearly $12.99
- KKUK Premium Monthly $1.99
- Copyright
- © 2026 Sangcheol Kim