the undo/redo feature of Words and Stage required a partial rewrite and caused a delay. Calligra 2.4 was released on 11 April 2012.

Calligra 2.4 launched with two mobile-oriented user interfaces: Calligra Mobile and Calligra Active. Calligra Mobile's development was initiated in summer 2009 and was first shown during Akademy / Desktop Summit 2009 by KO GmbH as a simple port of KOffice to Maemo. Later Nokia hired KO to assist them with a full-fledged