Jednoduchý kalendář is a Czech calendar application available on Android. It offers weekly and monthly views, including state holidays and name days. The app allows users to easily and quickly add their own events, tasks, and reminders without unnecessary details. It also allows users to create their own anniversaries and holidays, highlighting important names. Events can be moved by dragging with a finger, and upcoming events are highlighted on the home screen widgets.

The app offers a variety of features, including color coding for events, a wide selection of color palettes, and customization of colors. Users can also sync their data with other devices via a synchronized calendar (such as Google account) and filter events by color or multiple days. The absence of ads and respect for privacy without sending data outside the device are additional benefits. Jednoduchý kalendář is an ideal choice for anyone seeking a simple and efficient calendar app with all essential features.