# Parallel Books vs Glassboxx

The clearest difference is rating: Parallel Books at 5.0 against Glassboxx's 3.1. Parallel Books also leads on review sentiment (40% vs 28%). Glassboxx's advantage is ratings volume (75 vs 1) and update cadence (every 6 weeks vs every 3 months). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Parallel Books holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Glassboxx has 75 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 40% of Parallel Books's written reviews are positive against 28% of Glassboxx's.

Parallel Books ships an update every 3 months, Glassboxx every 6 weeks. The most recent releases landed on October 21, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Parallel Books | Glassboxx |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/parallel-books/id1045596664/reviews)** | [3.1 (75 ratings)](https://appshunter.io/ios/app/glassboxx/id1464705712/reviews) |
| Number of ratings | 1 | **75** |
| Positive reviews | **40.0% of reviews** | 27.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 2 MB | 35 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [High Tea IT Limited](https://appshunter.io/developer/1045596663) | [Glassboxx Limited](https://appshunter.io/developer/1547970169) |

## What reviewers say

### Parallel Books

[App page](https://appshunter.io/ios/app/parallel-books/id1045596664)

Learn a new language by reading books with side-by-side translations. This app keeps translations synchronized as you read, allowing for full immersion. Easily switch between display modes and add notes for a personalized learning experience.

**Highlights:** Dual language display, Synchronized translations, Adjustable display modes, Searchable notes, Day/night themes, Highlighting

**Features:** macOS Compatibility

**In-app purchases:** none


### Glassboxx

[App page](https://appshunter.io/ios/app/glassboxx/id1464705712)

Access your purchased eBooks and audiobooks from affiliated stores in one secure app. No passwords needed, just your email and a verification code. Enjoy offline reading and listening with advanced playback and reading features.

**Highlights:** Unified eBook and audiobook library, No password login, Offline reading and listening, Auto-save reading/listening position, Customizable reader (font, background), Audio playback controls (sleep timer, skip), Full text search

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

**In-app purchases:** none

**What reviewers like**

- ✨ Streamlined and elegant reading app
- 👍 User-friendly interface
- 💡 Font size customization
- 💡 Background customization
- 👍 Seamless transaction

**What reviewers complain about**

- 🐛 Frequent crashes
- 🐛 Books not downloading
- 🐛 Verification code issues
- 🐛 Poor customer support response
- 🐛 Unusable app experience

**Reported bugs**

- App crashes on startup
- App crashes when loading downloaded book
- App crashes between chapters
- App freezes
- App won't open

**Requested features**

- Bookmark feature
- See time remaining in entire audiobook
- Pagination via cursor keys on iPad Magic Keyboard
- Dark mode option
- Advanced analytics dashboard


## Frequently asked questions

### Is Parallel Books free?

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

### Is Glassboxx free?

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

### Which has better reviews, Parallel Books or Glassboxx?

Parallel Books is rated higher. Parallel Books averages 5.0 out of 5 from 1 ratings, while Glassboxx averages 3.1 from 75 ratings.

### Do Parallel Books or Glassboxx have ads?

Neither Parallel Books nor Glassboxx shows ads.

### Which is updated more often, Parallel Books or Glassboxx?

Parallel Books ships an update every 3 months, and Glassboxx every 6 weeks. Most recently, Parallel Books was updated on October 21, 2026 and Glassboxx on October 26, 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.*