Take notes with search and folder organization. Change font, size, and main color. Set password lock. Access premium features for 280 yen per month with automatic renewal. Manage subscriptions through Apple ID settings.
Calendar allows users to customize icons and backgrounds with illustrations. Set different colors for events. View 3-day or 4-7-day calendars. Scroll vertically to navigate dates. Tap a date to see event details.
Create and manage shared checklists with multiple users. Add tasks, set due dates, and mark items as complete. Customize themes with dark mode support. Access premium features without ads by linking a phone number. Backup data automatically.
![checka! [チェッカ] app icon](https://is1-ssl.mzstatic.com/image/thumb/Purple116/v4/c2/50/42/c250427f-4c3c-2f73-f466-6131ff29c3f6/AppIcon-0-0-1x_U007emarketing-0-7-0-85-220.png/512x512bb.jpg)
