: Kobo offers a dedicated iOS app and a massive catalog. Like other third-party retailers, purchases must be made through their website in a browser before they sync to the app. Specialized and Niche Retailers
: While you cannot purchase books directly inside the Kindle app due to Apple's in-app purchase commissions, you can buy them via Amazon's website in Safari. Once purchased, they instantly appear in your Kindle app library.
: This is the built-in storefront on every iPhone. You can browse the "Book Store" tab to purchase ebooks and audiobooks directly using your Apple ID. It offers seamless integration, allowing you to sync progress across all your Apple devices automatically.
: If you prefer the B&N ecosystem, you can buy books on the NOOK website and read them via the free NOOK app for iOS. Free and Public Domain Resources
Buying books on an iPhone is primarily handled through Apple's native ecosystem, though several third-party alternatives offer vast libraries and specialized reading experiences. Primary Digital Bookstores