Amazon Kindle

Even if you’ve never owned a physical Kindle e-reader, the Kindle app is still one of the best reading apps on iPhone. Amazon’s ecosystem is massive, and many people already have Kindle books from years ago, which makes this an instant win the moment you sign in.

Kindle’s sync is the main reason people stick with it. You can read a few pages on your iPhone, switch to another device later, and it remembers exactly where you stopped. That sounds basic, but if you’ve been forced to find where you left off manually, you know it’s a huge difference. Plus, the new AI-powered “Story So Far” tool is a lifesaver if you’re returning to a complex novel after a break.

The app also does a great job with highlights and notes, especially if you like saving quotes for later. You can make reading feel more comfortable with font adjustments and themes, and the app usually runs smoothly even with large books and big libraries.

Just like many of the other apps on the list, you can import your own PDFs in case you want to read something that’s not on Amazon. Speaking of Amazon, it constantly has some crazy deals throughout the year, with many books offered entirely free or included with a Prime membership.