With CheckBox, you can manage your tasks in a simple way.

CheckBox offers you a simple task list.
A task can have sub tasks.
You can edit sub tasks in the task list view.

Tasks are shared with Reminder, and changes are reflected immediately.

You can select a theme, and make your list what you like.

The text size is changed by the system settings.
Tasks are displayed with the text size you prefer.

You can send a task with Mail or Messages.

This app supports Apple Watch.
You can manipulate reminders and add a new reminder on your Apple Watch.