Mood-Tracker is an iPhone app developed by Kei Suefuji that allows users to conveniently record and track their daily mood. With just a few taps, users can select their mood from a scrollable list or by using the arrows on the home screen. Once the mood is selected, simply tap the Save button to record it.

The app also provides a memo column where users can fill in the situation and reason behind their mood, allowing for a more detailed analysis.

The "Yearly" screen displays the average daily mood in a list format, providing users with an overview of their mood patterns over time.

On the "History" screen, users can view their recorded moods for any selected date on the calendar. The data can be modified using the edit button on the top right of the screen, and users can also add data that they may have forgotten to record using the "Add" button.

For a deeper analysis, the "Analytics" screen offers graphs that visualize mood changes over the course of a week, month, and year.

Customization options are available on the "Settings" screen, where users can choose the first day of the week for the calendar, starting from either Monday or Sunday.

The free version of Mood-Tracker allows users to check their history for up to one week. For unlimited access to all history, users can consider purchasing the premium version within the app.