超シンプルならくらくカレンダー (Super Simple and Easy-to-Use Calendar) is a free iPhone app developed by Masaya Kato. This calendar app is designed to be user-friendly and straightforward, making it accessible to everyone. It not only serves as a calendar but also allows users to take notes.

The app features a minimalist design, ensuring that there is no unnecessary clutter or distractions. Users can easily navigate through different months by swiping left or right on the calendar screen. Additionally, the app includes support for Japanese holidays, making it convenient for users in Japan.

With its simplicity and intuitive interface, 超シンプルならくらくカレンダー is a great choice for those who prefer a straightforward and easy-to-use calendar app on their iPhone. Whether you need to keep track of important dates or jot down quick notes, this app has got you covered.