Sv. Kalender is a free Android app developed by Tollgate 3 AB that provides three widget options: a month calendar, a day calendar, and a week number. The calendars display Swedish holidays and name days according to Swedish standards. Users can customize the background color, text size, and date format according to their preferences.

The month calendar widget displays the date, weekday, week number, Swedish holidays (by clicking on the corresponding day), and Swedish name days (by clicking on the corresponding day). Users can navigate to the previous or next month by clicking on the corresponding arrow or return to the current month by clicking on the month's name.

The day calendar widget displays the date, weekday, week number, and Swedish name day.

The week number widget simply displays the current week number.

To install the widget, users need to go to the Android widget screen, scroll to Sv. Kalender, and drag and drop the widget. Users can adjust the widget's size by long-pressing on it and dragging its edges. To customize the widget's settings, users need to click on the widget's top row and adjust the text size, date format, and background color.

Overall, Sv. Kalender is a useful and customizable widget for those who want to keep track of Swedish holidays and name days on their Android device.