# Book Towers vs 사보 원자력연료

The clearest difference is in-app purchases: 사보 원자력연료 at none against Book Towers's 10. 사보 원자력연료 also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.0). Book Towers's advantage is update cadence (every 2 weeks vs every 16 months). On price and device support there is nothing between them.

Both are free to download. Book Towers sells 10 in-app purchases, starting at $1.99 per month. 사보 원자력연료 asks for nothing beyond the download.

Book Towers ships an update every 2 weeks, 사보 원자력연료 every 16 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Book Towers | 사보 원자력연료 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (274 ratings)](https://appshunter.io/ios/app/book-towers-reading-tracker/id1472538417/reviews)** | — |
| Number of ratings | **274** | — |
| Positive reviews | 87.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 16 months |
| Monetization | Free with in-app purchases | — |
| Size | 161 MB | 16 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sungeun Park](https://appshunter.io/developer/1406693209) | [soluwin corporation](https://appshunter.io/developer/747540016) |

## What reviewers say

### Book Towers

[App page](https://appshunter.io/ios/app/book-towers-reading-tracker/id1472538417)

Track your reading progress by stacking virtual books to reach a height goal. Log finished, current, and desired reads with ratings and notes. Unlock and customize collectible characters as your tower grows.

**Highlights:** Stack virtual books to reach height goals, Track reading status (Finished, Current, Want to Read, Stopped), Add ratings, reviews, and notes, Unlock and customize over 60 characters, View monthly reading statistics, Export reading logs, Customize app appearance

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Yearly | $14.99 | per year |
| 레벨2 | $0.99 | one-time |
| 3단계 캐릭터 | $0.99 | one-time |
| 4단계 캐릭터 | $0.99 | one-time |
| 5단계 캐릭터 | $0.99 | one-time |
| 6단계 캐릭터 | $0.99 | one-time |
| 코인 100 | $1.49 | one-time |
| 코인 150 | $2.79 | one-time |
| 코인 300 | $4.99 | one-time |


### 사보 원자력연료

[App page](https://appshunter.io/ios/app/id1550920161)

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

**In-app purchases:** none


## Frequently asked questions

### Is Book Towers free?

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

### Is 사보 원자력연료 free?

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

### Do Book Towers or 사보 원자력연료 have ads?

Book Towers shows ads; 사보 원자력연료 does not.

### Which is updated more often, Book Towers or 사보 원자력연료?

Book Towers ships an update every 2 weeks, and 사보 원자력연료 every 16 months. Most recently, Book Towers was updated on November 6, 2026 and 사보 원자력연료 on November 3, 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.*