In some embodiments, a system may process a user interface to identify textual or graphical items in the interface, and may prepare a plurality of audio files containing spoken representations of the items. As the user navigates through the interface, different ones of the audio files may be selected and played, to announce text associated with items selected by the user. A computing device may periodically determine whether a cache offering the interface to users stores audio files for all of the interface's textual items, and if the cache is missing any audio files for any of the textual items, the computing device may take steps to have a corresponding audio file created.