# UnderBooks vs Astrolabium

The clearest difference is rating: UnderBooks at 4.8 against Astrolabium's 4.0. UnderBooks also leads on ratings volume (19 vs 1) and iOS requirement (15.6 vs 17.0). Astrolabium's advantage is ads (none vs shown) and update cadence (every 2 weeks vs monthly). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. UnderBooks sells 10 in-app purchases, starting at $2.99 per 7 days and Astrolabium sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UnderBooks holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: UnderBooks has 19 ratings behind it against 1, so its average is the more settled of the two.

UnderBooks ships an update monthly, Astrolabium every 2 weeks. Both last shipped on November 12, 2026.

## The numbers

| Metric | UnderBooks | Astrolabium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (19 ratings)](https://appshunter.io/ios/app/underbooks/id1670343606/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/astrolabium/id6739530280/reviews) |
| Number of ratings | **19** | 1 |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 84 MB | 67 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Hryhorii Cherkaskyi](https://appshunter.io/developer/1670343608) | [ASTROLABE PUBLISHING LLC](https://appshunter.io/developer/1785849674) |

## What reviewers say

### UnderBooks

[App page](https://appshunter.io/ios/app/underbooks/id1670343606)

Discover a curated collection of Ukrainian audiobooks featuring classic and contemporary authors. Enjoy professionally narrated literary works and unique illustrations, perfect for busy individuals seeking quality literature on the go.

**Highlights:** Ukrainian audiobooks, Classic and contemporary literature, Professional narration, Original illustrations, Curated literary collection, Offline listening

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UnderBooks Pro 1 Week | $2.99 | per 7 days |
| UnderBooks Pro | $7.99 | per month |
| UnderBooks Pro 6 months | $12.99 | per 6 months |
| UnderBooks Pro Annual | $24.99 | per year |
| UnderBook "Medium" | $2.99 | one-time |
| UnderBook "Big" | $3.99 | one-time |
| UnderBook "Big+" | $5.99 | one-time |
| 1 month subscription | $7.99 | one-time |
| Підписка на 6 місяців | $12.99 | one-time |
| 1 year subscription | $24.99 | one-time |


### Astrolabium

[App page](https://appshunter.io/ios/app/astrolabium/id6739530280)

This app offers a vast library of e-books and audiobooks across various genres. Enjoy reading or listening offline, with customizable reading and playback options. Discover new ideas and immerse yourself in literature at your own pace.

**Highlights:** E-book and audiobook reader in one app, Offline access to downloaded content, Customizable reading and playback settings, Diverse library of fiction and non-fiction, Progress saving across formats, Personalized recommendations

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audio and e-book | $6.49 | one-time |
| Audio and e-book | $15.49 | one-time |
| Audio and e-book | $16.99 | one-time |
| Audio and e-book | $17.99 | one-time |
| Audio and e-book | $18.49 | one-time |
| Audio and e-book | $18.99 | one-time |
| Audio and e-book | $19.49 | one-time |
| Audio and e-book | $19.99 | one-time |
| Audio and e-book | $20.49 | one-time |
| Audio and e-book | $20.99 | one-time |


## Frequently asked questions

### Is UnderBooks free?

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

### Is Astrolabium free?

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

### Which has better reviews, UnderBooks or Astrolabium?

UnderBooks is rated higher. UnderBooks averages 4.8 out of 5 from 19 ratings, while Astrolabium averages 4.0 from 1 ratings.

### Do UnderBooks or Astrolabium have ads?

UnderBooks shows ads; Astrolabium does not.

### Which is updated more often, UnderBooks or Astrolabium?

UnderBooks ships an update monthly, and Astrolabium every 2 weeks. Most recently, UnderBooks was updated on November 12, 2026 and Astrolabium on November 12, 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.*