Best Reading Apps for iPhone (2026)
The best reading app for iPhone depends on what you read. Full-book readers, summary readers, and people saving long articles have different needs. Compare source coverage, sync, accessibility, privacy, and current plan terms instead of assuming one app fits every workflow.
The shortlist
Summio
AI-native reading companion: turns eligible catalogue books, public YouTube videos with usable transcript context, compatible public articles, and compatible text-based PDFs into structured summaries with source-context chat.
Apple Books
A full-work reading provider in Apple's ecosystem; verify its current store, sync, audio, platform, and regional availability details with Apple.
Kindle for iOS
A full-work reading provider in Amazon's ecosystem; verify its current store, sync, feature, platform, and regional availability details with Amazon.
Readwise Reader
A provider in the read-later category; verify its current input, highlight, AI, sync, and plan details on the provider site.
Common questions
Is there a free reading app for iPhone?
App access, content purchases, trials, and free allowances differ. Check the current App Store listing and provider checkout; Summio shows its current free-tier limits in the product.
Which reading app has AI chat with books?
Summio offers chat with the summary and available source context for eligible catalogue books, public YouTube videos with usable transcript context, compatible public articles, and compatible text-based PDFs. Other products change over time; verify their current AI and source-support details on the provider site.
Can I sync my reading across iPhone, iPad, and web?
Summio provides Web and iOS access for a signed-in account. Cross-device behavior varies by provider, platform, region, and content type; verify the current details before choosing.
Start reading with Summio
Use Summio in your browser, or get the iOS app from the App Store.