Supported Contents
Oboku use https://prose-reader.com/ which is a flexible engine made to support any kind of contents. There is no hard limitations on what can be supported and if your book does not work let us know.
Currently known supported formats
Section titled “Currently known supported formats”.ziparchives (comics, audiobooks, etc).cbzarchives (this is a zip archive).rararchives (same support as zip).epubfiles (they are zip archives, commonly used for regular books).pdffiles.txtfiles