Petit Diary is a lifestyle app developed by GalleryApp for Android devices. It is a simple and easy-to-use schedule and plan manager that allows users to manage their daily tasks and events with ease. The app has a clean and intuitive interface, making it user-friendly, even for those who are not tech-savvy.

With Petit Diary, users can register new events and plans by tapping the pencil (event) button on the calendar. They can select an event icon to save the event, add a memo, and set an alarm. The app also allows users to customize the event icon list by creating subcategories and editing the content of the default event icons.

Additionally, Petit Diary enables users to create repeated plans with specific intervals, such as every day or every week. However, it is important to note that the app does not sync with Google Calendar. Overall, Petit Diary is a great option for those looking for a simple and effective way to manage their daily schedule and tasks.