# Bookshelf vs Sixti

The clearest difference is in-app purchases: Bookshelf at none against Sixti's 3. Bookshelf also leads on chart position (#90 vs unranked). Sixti's advantage is update cadence (weekly vs every 6 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Sixti sells 3 one-off in-app purchases. Bookshelf asks for nothing beyond the download.

Bookshelf ships an update every 6 weeks, Sixti weekly. The most recent releases landed on November 4, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | Bookshelf | Sixti |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (80K ratings)](https://appshunter.io/ios/app/bookshelf/id389359495/reviews)** | — |
| Number of ratings | **80K** | — |
| Positive reviews | 21.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | — |
| Best chart rank | **#90** | — |
| Size | 185 MB | 47 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [VitalSource Technologies, Inc.](https://appshunter.io/developer/333263745) | [Gavin Hart](https://appshunter.io/developer/6773541395) |

## What reviewers say

### Bookshelf

[App page](https://appshunter.io/ios/app/bookshelf/id389359495)

**Currently charting:** #90 Top Free · Education (US App Store)

Access and study your digital textbooks on your iPad or iPhone. This app allows for offline reading, note-taking, flashcard creation, and customizable reading settings. Sync your progress across devices for a seamless study experience.

**Highlights:** Offline reading, Customizable highlighters and notes, Flashcard creation, Personalized reading settings, Read Aloud feature, Cross-device syncing

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 📚 Convenient access to textbooks
- 🔍 Useful search functionality
- 📚 Offline reading capability
- 🔖 Bookmark and note-taking features
- 🔊 Text-to-speech option

**What reviewers complain about**

- 🐛 Buggy highlighting and annotation tools
- 🖋️ Lack of Apple Pencil support
- 📚 Restricted functionality compared to other e-book apps
- 🔍 Inconsistent search and navigation experience
- 🔋 High battery consumption

**Reported bugs**

- Frequent crashes and freezes
- Issues with page loading and scrolling
- Inconsistent behavior when switching between devices
- Unreliable text-to-speech functionality

**Requested features**

- Improved highlighting and annotation tools
- Apple Pencil support for note-taking
- More customization options (e.g., font, layout, night mode)
- Seamless cross-device synchronization
- Enhanced search and navigation features


### Sixti

[App page](https://appshunter.io/ios/app/sixti/id6801658787)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Energy drink | $1.99 | one-time |
| Gold | $4.99 | one-time |
| Table | $9.99 | one-time |


## Frequently asked questions

### Is Bookshelf free?

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

### Is Sixti free?

Sixti is free to download, with in-app purchases available.

### Do Bookshelf or Sixti have ads?

Neither Bookshelf nor Sixti shows ads.

### Which is updated more often, Bookshelf or Sixti?

Bookshelf ships an update every 6 weeks, and Sixti weekly. Most recently, Bookshelf was updated on November 4, 2026 and Sixti on October 11, 2026.

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