The Android application uses an Action bar across the top of the screen. Since commonly used actions such as “Load” and “Subtract” are always visible, the user can quickly control the application. However, because of the Action bar, the application is only supported on devices that have Android 3.0 and above. Less common actions such as logging into Dropbox or peak selection are accessed through the “action overflow” button of the Action bar, so not to overwhelm the user. Touch, pinch and pan gestures allow the user to select and manipulate spectra. However, when labelling peaks, the user must use the zoom toolbar to vary the number of annotations displayed