Best Reading Apps for iPhone (2026)
The best reading app for iPhone depends on what you read. For full books, Apple Books or Kindle. For book summaries with AI chat, Summio. For long articles saved across devices, Pocket or Instapaper. The right answer is rarely a single app — most readers run two or three for different jobs.
The shortlist
Summio
AI-native reading companion: turns books, YouTube videos, articles, and PDFs into structured summaries; chat with any source you saved.
Apple Books
Built-in iPhone reader with iCloud sync, an integrated bookstore, and audiobook support — free and well-designed.
Kindle for iOS
Largest e-book catalogue, X-Ray for character notes, Whispersync between devices.
Readwise Reader
Read-later app with highlights, AI-assisted notes, and an integrated RSS reader.
Common questions
Is there a free reading app for iPhone?
Yes — Apple Books is free and pre-installed. Summio has a generous free tier for AI summaries. Kindle for iOS is also free if you already buy books on Amazon.
Which reading app has AI chat with books?
Summio has chat with the full source for books, videos, articles, and PDFs you summarise. Readwise Reader has AI-assisted highlights but not full chat.
Can I sync my reading across iPhone, iPad, and web?
Apple Books and Kindle sync across iPhone and iPad natively. Readwise Reader and Summio sync across iPhone and iPad; web access is on the roadmap.
Try Summio free on iPhone
Open input — paste any book, YouTube video, article, or PDF. 27 languages. Free tier, no credit card to start.
Download Summio →