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Unity 2D was a set of individual applicationscite-ref-2d-components-35-0[35] developed for environments that Compiz does not run on, such as when graphics card does not support OpenGL. They were written in the GUI building language QML from the widespread Qt framework.cite-ref-2d-qml-36-0[36] By default Unity 2D used the Metacity window managercite-ref-2d-components-35-1[35] but could also use accelerated window managers like Compiz or KWin. In Ubuntu 11.10, Unity 2D used Metacity's XRender-based compositor to achieve transparency effects. Starting with Ubuntu 11.10, Unity 2D replaced the classic GNOME Panel as the fall-back for users whose hardware could not run the Compiz version of Unity.cite-ref-omg27may11-37-0[37]

Unity 2D was discontinued for the release of Ubuntu 12.10 in October 2012, as the 3D version became more capable of running on lower-powered hardware.cite-ref-38[38]

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