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Same five topics on every shelf, so Kindle and Kobo are easy to compare. Open a shelf for formats, sideloading, library loans, buying rules, and reading setup.
Start with the app you already use. If you only have a pile of EPUB files, open EPUB or Calibre. If the book came from a library card, open Libby first and only then ask whether Kindle fulfillment exists in your country.
kindleKindleStore books and personal documents are two different piles.koboKoboEPUB-first readers. OverDrive is built into many e-ink models.apple-booksApple BooksEPUB and PDF on iPhone, iPad, and Mac, tied to your Apple ID.google-playGoogle Play BooksAndroid and web reader, with a separate stack for files you upload.libbyLibbyLibrary loans. The book leaves on the due date.epubEPUBThe open reflowable format most stores use, except Amazon purchases.pdfPDFFixed pages. Fine for papers and textbooks, clumsy for novels on e-ink.calibreCalibreA desktop library for DRM-free files. Not a store and not a pirate tool.