My Check Box

Never miss a lunar birthday or a memorial day again.
Write a task on the calendar, check it off when it's done. That's all My Check Box is.
A warm, hand-drawn screen that makes your day feel like a paper diary.


■ Lunar dates, calculated correctly

Register a lunar date once and the app remembers it every year.

· Yearly lunar repeat — birthdays, memorial days, anniversaries
· Lunar dates corrected against Korea Astronomy and Space Science Institute (KASI) data
· Leap months and Lunar New Year land on the right day
· Show lunar dates on the calendar (can be turned off in settings)

Common lunar calculation methods drift from the Korean lunar calendar on certain days. My Check Box ships correction data to solve that.


■ One calendar for the whole day

· Tap a date and that day's checklist appears immediately
· Move unfinished tasks to today or tomorrow with a single tap
· Repeats — weekly, monthly, yearly, yearly (lunar)
· National holidays and substitute holidays shown on the calendar
· Reminders at the time you choose (on time, 5 min, 30 min, 1 hour, 1 day before, and more)
· Task count on the app icon badge


■ Home screen widgets — the small one is free

· Small widget: today's tasks (free)
· Medium widget: tasks with no date
· Large widget: this month's calendar with tasks and holidays
· Tap a widget to jump straight to that screen


■ Change phones, or share with an iPhone

· Google Drive backup and restore
· Automatic sync across your devices
· Exchange data with the iOS version — handy when family members use iPhones, or when you switch phones


■ The feel of a paper diary

· 7 handwriting fonts to choose from
· Warm, hand-drawn design
· Sort tasks into 8 color categories and filter by them


■ Light on your phone

About 14MB installed. Comfortable even on older devices.


■ Pro upgrade (optional)

Every core feature is available for free. Pro adds:
· No ads
· Medium and large widgets
· Unlimited categories


■ A good fit if you

· Track lunar birthdays and memorial days every year
· Don't want to miss anniversaries or D-days
· Find full calendar apps more complicated than you need
· Like the feel of a paper diary
· Want your calendar and your to-do list on one screen


My Check Box first launched on iOS in 2013 and has been used around the world since. Available in 15 languages.
Questions and suggestions are always welcome.

Recent changes:
• Tasks now sort automatically by priority, scheduled time, then creation time.
• Your custom order stays in place after editing tasks or restarting the app.
• Improved ordering when adding tasks, changing dates, or marking tasks complete.
• Consistent task order across lists, calendars, and home screen widgets.