# Twinkle Clock vs Astral Book

The clearest difference is update cadence: Astral Book at weekly against Twinkle Clock's every 3 weeks. Astral Book also leads on iOS requirement (15.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Twinkle Clock sells 1 one-off in-app purchase and Astral Book sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Twinkle Clock ships an update every 3 weeks, Astral Book weekly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Twinkle Clock | Astral Book |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 23 MB | 55 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | **iPhone, iPad, Mac, Vision Pro** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyasu Hirai](https://appshunter.io/developer/455568461) | [kazuki korenori](https://appshunter.io/developer/1884835388) |

## What reviewers say

### Twinkle Clock

[App page](https://appshunter.io/ios/app/twinkle-clock/id6467501688)

**Features:** iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Twinkle Clock Pro | $24.99 | one-time |


### 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 Twinkle Clock free?

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

### Is Astral Book free?

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

### Do Twinkle Clock or Astral Book have ads?

Neither Twinkle Clock nor Astral Book shows ads.

### Which is updated more often, Twinkle Clock or Astral Book?

Twinkle Clock ships an update every 3 weeks, and Astral Book weekly. Most recently, Twinkle Clock was updated on October 27, 2026 and Astral Book on October 24, 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.*