How can I use advanced task features like subtasks?

DAVx⁵ stores all task information in the database (content provider) of a supported app. Currently, these task apps are supported:


The OpenTasks app is not only a content provider, but also provides a graphical user interface (GUI) for manipulating tasks (see illustration above). However, the GUI currently doesn't implement all things which are supported by the content provider, like

  • subtasks,
  • recurring tasks, and
  • task categories.

To view and edit these advanced things on your Android device, you need (additionally to OpenTasks) an app that provides a GUI for them.

At the moment, the only app we know for that is aCalendar+, which provides a GUI for subtasks support. If you know other apps, please let us know.


The Tasks app ( is supported since DAVx⁵ 3.3.2.

There's a list of supported features at

Last updated: 29 Sep 2020