This is a versatile e-book reader app that handles PDF files, with support for annotations and Adobe Content. Bluefire has a clean, customisable viewer that allows you to set text size and margin widths, themes and a night mode, as well as a table of contents and bookmarks. Users can highlight, set annotations, search the text, look up definitions and share excerpts. It has a collection for over 100,000 books fiction or non-fiction with easy display featuring light adjustments, so you can read them without any problem. The iOS version also includes reading location synchronisation, allowing you to switch between devices without losing your reading location.