# Amazon Kindle vs KyBook 3 Ebook Reader

The clearest difference is in-app purchases: Amazon Kindle at none against KyBook 3 Ebook Reader's 4. Amazon Kindle also leads on ratings volume (5.9M vs 4.7K) and chart position (#4 vs unranked). KyBook 3 Ebook Reader's advantage is update cadence (every 5 days vs fortnightly) and iOS requirement (11.0 vs 17.0). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. KyBook 3 Ebook Reader sells 4 in-app purchases, starting at $4.49 per 3 months. Amazon Kindle asks for nothing beyond the download.

Amazon Kindle holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Amazon Kindle has 5.9M ratings behind it against 4.7K, so its average is the more settled of the two. Written reviews point the same way: 68% of Amazon Kindle's written reviews are positive against 61% of KyBook 3 Ebook Reader's.

Amazon Kindle ships an update fortnightly, KyBook 3 Ebook Reader every 5 days. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Amazon Kindle | KyBook 3 Ebook Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (5.9M ratings)](https://appshunter.io/ios/app/amazon-kindle-reading-app/id302584613/reviews)** | [4.7 (4.7K ratings)](https://appshunter.io/ios/app/kybook-3-ebook-reader/id1348198785/reviews) |
| Number of ratings | **5.9M** | 4.7K |
| Positive reviews | **67.6% of reviews** | 61.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 5 days** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#4** | — |
| Size | 206 MB | 53 MB |
| Requires iOS | 17.0 | **11.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [AMZN Mobile LLC](https://appshunter.io/developer/297606954) | [Konstantin Bukreev](https://appshunter.io/developer/547576207) |

## What reviewers say

### Amazon Kindle

[App page](https://appshunter.io/ios/app/amazon-kindle-reading-app/id302584613)

**Currently charting:** #4 Top Free · Book (US App Store)

Access and read millions of ebooks, magazines, and comics on your device. Customize your reading experience with adjustable text, brightness, and layout. Sync your progress, notes, and highlights across all your devices seamlessly.

**Highlights:** Access millions of ebooks, magazines, and comics, Customize text size, font, and layout, Adjustable brightness and background colors, Built-in dictionary and Wikipedia lookup, Track reading progress with page numbers, Sync reading progress across devices, Seamlessly switch between reading and listening

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 📚 Huge library of books
- 📱 Portable and convenient
- 🔍 Useful features like dictionary lookup and highlighting
- 🌙 Adjustable reading settings (font, brightness, etc.)
- 🔁 Seamless syncing across devices

**What reviewers complain about**

- 🛒 Cannot purchase books directly in the app
- 🗂️ Difficulty organizing and managing large book libraries
- 🔍 Inconsistent behavior when highlighting/taking notes
- 🔄 Unreliable syncing between devices
- 🔌 Drains device battery quickly

**Reported bugs**

- App crashes or freezes when switching between apps
- Incompatibility issues with newer iOS versions
- Dictionary lookup feature not working reliably

**Requested features**

- Ability to create and manage collections/folders for books
- Option to easily see which books have been read vs unread
- Improved highlighting and note-taking functionality
- Better syncing between Kindle devices and apps
- Dark mode and other customization options


### KyBook 3 Ebook Reader

[App page](https://appshunter.io/ios/app/kybook-3-ebook-reader/id1348198785)

This app is a versatile e-book reader and cataloger supporting numerous formats like EPUB, MOBI, and PDF. It offers a comfortable reading experience with customizable options, powerful annotation tools, and seamless cloud storage integration. Organize your library with tags, collections, and a handy cataloguer.

**Highlights:** Supports all major e-book formats, OPDS catalog access, Comfortable reading mode with themes, Powerful annotations and summary editor, Handy cataloguer with tagging, Cloud storage integration

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 months subscription | $4.49 | per 3 months |
| Yearly subscription | $14.99 | per year |
| Upgrade to Pro (Discount) | $2.99 | one-time |
| Upgrade to Pro | $4.99 | one-time |

**What reviewers like**

- 🚀 Excellent design, close to no ads
- 🚀 Handles various file formats well
- 👍 Customizable, lots of features
- 👍 Stable and fast
- 👍 Good for reading comics/manga

**What reviewers complain about**

- 🐛 Sync and account issues
- 🐛 Crashes, bugs, and compatibility problems
- 🔍 Confusing interface, hard to use
- 💰 Paid features and subscription model
- 🔍 Missing key features like page turn animation

**Reported bugs**

- Inability to open/read certain file formats
- Sync and account creation issues
- Problems with PDF and image display
- Crashes and compatibility problems
- Duplication of books in library

**Requested features**

- Left alignment option
- Dark mode/OLED black theme
- Improved image handling
- Better support for Chinese language
- Vertical page flip


## Frequently asked questions

### Is Amazon Kindle free?

Amazon Kindle is free to download, with no in-app purchases.

### Is KyBook 3 Ebook Reader free?

KyBook 3 Ebook Reader is free to download, with in-app purchases available.

### Which has better reviews, Amazon Kindle or KyBook 3 Ebook Reader?

Amazon Kindle is rated higher. Amazon Kindle averages 4.9 out of 5 from 5.9M ratings, while KyBook 3 Ebook Reader averages 4.7 from 4.7K ratings.

### Do Amazon Kindle or KyBook 3 Ebook Reader have ads?

Neither Amazon Kindle nor KyBook 3 Ebook Reader shows ads.

### Which is updated more often, Amazon Kindle or KyBook 3 Ebook Reader?

Amazon Kindle ships an update fortnightly, and KyBook 3 Ebook Reader every 5 days. Most recently, Amazon Kindle was updated on November 6, 2026 and KyBook 3 Ebook Reader on November 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*