Best Knowledge Reader App

248+ iOS apps curated and reviewed

3.6 avg rating
20 free apps
Updated September 2026

Whether you're new to knowledge reader app or looking for an upgrade, our curated collection of 248+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Compare top Knowledge Reader App (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Amazon Kindle: Reading AppAmazon Kindle: Reading AppFree4.9โ˜… (5.9M)NoNoOct 2026
2Readwise ReaderReadwise ReaderFree4.6โ˜… (584)NoYesOct 2026
3Knowledge from OnlineObjectsKnowledge from OnlineObjectsFree5.0โ˜… (2)NoNoMay 2026
4Reader++Reader++Freeโ€”NoYesOct 2026
5Elsevier eLibrary ReaderElsevier eLibrary ReaderFree1.0โ˜… (79)NoNoMay 2026
6Reader ZoneReader ZoneFree3.4โ˜… (82)NoNoAug 2026
7Recall: Summarize & saveRecall: Summarize & saveFree4.1โ˜… (67)NoNoOct 2026
8Knowledge4AllKnowledge4AllFreeโ€”NoNoMay 2026

Top Picks for Knowledge Reader App

Amazon Kindle: Reading App#1

Amazon Kindle: Reading App by AMZN Mobile LLC

Read books. Millions of ebooks
Editor's Choice
๐Ÿ“š Books
4.9๐Ÿ˜Š(5.9M ratings)
FreeIn-App Purchases
#3in Books
Amazon Kindle: Reading App screenshot 1
Amazon Kindle: Reading App screenshot 2
Amazon Kindle: Reading App screenshot 3
Amazon Kindle: Reading App screenshot 4
Amazon Kindle: Reading App screenshot 5
Amazon Kindle: Reading App screenshot 6

Access a vast library of eBooks, magazines, and comics on your mobile device. Customize your reading experience with adjustable text, brightness, and page-turning options. Look up words, track progress, and sync across devices.

What We Love

  • ๐Ÿ“š Huge library of books
  • ๐Ÿ“ฑ Portable and convenient
  • ๐Ÿ” Useful features like dictionary lookup and highlighting
  • ๐ŸŒ™ Adjustable reading settings (font, brightness, etc.)
  • ๐Ÿ” Seamless syncing across devices
  • ๐Ÿ’ฐ Affordable books and Kindle Unlimited subscription

Room to Improve

  • ๐Ÿ›’ Cannot purchase books directly in the app
  • ๐Ÿ—‚๏ธ Difficulty organizing and managing large book libraries
  • ๐Ÿ” Inconsistent behavior when highlighting/taking notes
  • ๐Ÿ”„ Unreliable syncing between devices
  • ๐Ÿ”Œ Drains device battery quickly
Readwise Reader#2

Readwise Reader by Readwise, Inc

All your reading in one place
Strong Contender
๐Ÿ“Š Productivity
4.6๐Ÿ˜Š(584 ratings)
FreeIn-App Purchases
Readwise Reader screenshot 1
Readwise Reader screenshot 2
Readwise Reader screenshot 3
Readwise Reader screenshot 4
Readwise Reader screenshot 5
Readwise Reader screenshot 6

This app consolidates all your reading content, including web articles, newsletters, and PDFs, into a single, organized platform. It offers advanced highlighting, text-to-speech, and AI-powered assistance to enhance your reading workflow and knowledge retention.

What We Love

  • ๐Ÿš€ Fantastic reading experience
  • ๐Ÿ‘ Seamless integration with Readwise
  • ๐ŸŽจ Beautiful and intuitive UI
  • ๐Ÿ“š All-in-one reading solution
  • ๐Ÿ” Powerful search and organization
  • ๐Ÿ—ฃ๏ธ Excellent text-to-speech capabilities
  • ๐Ÿ’ก Innovative AI-powered features
  • ๐Ÿค– Helpful ChatGPT integration

Room to Improve

  • ๐Ÿ› Occasional crashes and performance issues
  • ๐Ÿ” Cluttered interface for some users
  • ๐Ÿ’ฐ Expensive subscription model
  • ๐Ÿ–ฅ๏ธ Lack of iPad-specific features
  • ๐Ÿ“š Missing basic reader features (e.g., bookmarks)

More Knowledge Reader App apps to explore

FAQ about Knowledge Reader App

What is the best knowledge reader app for iPhone?
Amazon Kindle: Reading App tops our knowledge reader app ranking as of September 2026, with a 4.9-star average from 5.9M App Store ratings, and it's free to download.
Yes โ€” 20 of the top knowledge reader app we rank are free to download, including Amazon Kindle: Reading App and Readwise Reader.
Amazon Kindle: Reading App has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 248+ knowledge reader app on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.