# CloudLabs Circulatory system vs Astro Viewer

The clearest difference is update cadence: Astro Viewer at every 4 months against CloudLabs Circulatory system's every 21 months. CloudLabs Circulatory system's advantage is iOS requirement (9.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

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

CloudLabs Circulatory system ships an update every 21 months, Astro Viewer every 4 months. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | CloudLabs Circulatory system | Astro Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 4 months** |
| Size | 116 MB | 20 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Jiovany Orozco](https://appshunter.io/developer/1114670847) | [Heebok Lee](https://appshunter.io/developer/1855773499) |

## What reviewers say

### CloudLabs Circulatory system

[App page](https://appshunter.io/ios/app/cloudlabs-circulatory-system/id1635767989)

**Features:** macOS Compatibility

**In-app purchases:** none


### Astro Viewer

[App page](https://appshunter.io/ios/app/astro-viewer/id6755899238)

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

**In-app purchases:** none


## Frequently asked questions

### Is CloudLabs Circulatory system free?

CloudLabs Circulatory system is free to download, with no in-app purchases.

### Is Astro Viewer free?

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

### Do CloudLabs Circulatory system or Astro Viewer have ads?

Neither CloudLabs Circulatory system nor Astro Viewer shows ads.

### Which is updated more often, CloudLabs Circulatory system or Astro Viewer?

CloudLabs Circulatory system ships an update every 21 months, and Astro Viewer every 4 months. Most recently, CloudLabs Circulatory system was updated on October 27, 2026 and Astro Viewer on October 28, 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.*