To Do Calendar - Schedule SD is an iPhone app developed by Daisuke Suzuki. It falls under the category of Business & Productivity and is available for free. This app offers a unique approach to managing your to-do list by integrating it with a vertical calendar.

The main feature of To Do Calendar - Schedule SD is its vertical calendar, which allows you to view your to-do list in a calendar format. This makes it easy to visualize and plan your tasks for the day, week, or month. Additionally, the app offers a widget that can be placed on your home screen, providing quick access to your to-do list.

To help you stay organized, To Do Calendar - Schedule SD also includes features such as reminders and a lock screen option. The reminder feature ensures that you never miss an important task, while the lock screen option adds an extra layer of security to keep your to-do list private.

One unique feature of this app is the switch auto sleep functionality. This allows you to control when the app goes into sleep mode, ensuring that it is always available when you need it.

Overall, To Do Calendar - Schedule SD provides a convenient and visually appealing way to manage your to-do list. Its integration with a vertical calendar and additional features make it a useful tool for staying organized and productive.