# Lunea Observatory vs Astral Book

The clearest difference is in-app purchases: Lunea Observatory at none against Astral Book's 1. Astral Book's advantage is ads (none vs shown) and iOS requirement (15.0 vs 18.5). On price and device support there is nothing between them.

Both are free to download. Astral Book sells 1 one-off in-app purchase. Lunea Observatory asks for nothing beyond the download.

## The numbers

| Metric | Lunea Observatory | Astral Book |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 5 days |
| Size | 79 MB | 54 MB |
| Requires iOS | 18.5 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Marlin Mack](https://appshunter.io/developer/1822862783) | [kazuki korenori](https://appshunter.io/developer/1884835388) |

## What reviewers say

### Lunea Observatory

[App page](https://appshunter.io/ios/app/lunea-observatory/id6747781460)

**Features:** macOS Compatibility

**In-app purchases:** none


### Astral Book

[App page](https://appshunter.io/ios/app/astral-book/id6764449141)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Astral Book Pro | $5.99 | one-time |


## Frequently asked questions

### Is Lunea Observatory free?

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

### Is Astral Book free?

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

### Do Lunea Observatory or Astral Book have ads?

Lunea Observatory shows ads; Astral Book does not.

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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.*