Specialist Reader applications focus on the reading process as distinct from the writing or editing process. Author features a Reading Mode since the act of reading does not always require the same toolset and functionality.#
This section focuses on PDF reader since that is the commonly used publication document format used in academia and other fields. PDF is a ‘rendered’ format so there is very little a specific app can do with the appearance of the document, such as re-flow text and change colours, type size and so on. #
The iBooks application on macOS simply sends any PDF to Preview for reading. The Preview application gives the user minimal reading functionality, including a left slide-out menu which can display an interactive table of contents (which I have never seen as text in a PDF document, only as screenshots, even though Preview supports it) and the ability to see Highlighted and Annotated Tex, which does not work consistently but which is a useful addition.