Cue

Cue is an app that can display important matters such as to-do items, memos, and schedules on the lock screen. You can add them with a single tap, and they are visible at any time without having to open the app. It has functions such as real-time, calendar, focus mode, and timeline, allowing you to view schedules, focus on tasks, and display them cumulatively or by appointment according to time. It supports automatic backup via iCloud, and the data is only stored on the device and in iCloud. It is suitable for people who tend to forget things they've noted or only keep to-do items in a list and want to focus on one thing. It is not an app for managing the whole day, but rather highlights and shows the one thing that mustn't be forgotten at the moment.