: A classic choice with a clean interface specifically designed for this format. How to Download and Open FB2 Books
Since iPhones primarily support EPUB and PDF, you need a third-party app to open FB2 files:
: Once downloaded, tap the "Downloads" icon in Safari, select the file, and choose "Open in..." or the Share icon . Select your preferred reader app (e.g., KyBook or PocketBook) from the list.
: A free app that handles almost any format, including FB2, and offers cloud synchronization.