# Hatra Doctor vs ClientOS

The clearest difference is update cadence: ClientOS at every 2 days against Hatra Doctor's every 10 days. Hatra Doctor's advantage is iOS requirement (15.6 vs 17.0). 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.

Hatra Doctor ships an update every 10 days, ClientOS every 2 days. The most recent releases landed on October 19, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Hatra Doctor | ClientOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hatra-doctor/id6758518129/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 2 days** |
| Monetization | Free | — |
| Size | 56 MB | 6 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lera](https://appshunter.io/developer/1824699145) | [EASY TECHNOLOGY COMPANY FOR CREATING PHONE AND COMPUTER APPLICATIONS LIMITED](https://appshunter.io/developer/1657980338) |

## What reviewers say

### Hatra Doctor

[App page](https://appshunter.io/ios/app/hatra-doctor/id6758518129)

Explore science and medicine with an app inspired by historical knowledge and modern innovation. It offers tools, resources, and interactive content for students, professionals, and curious minds to make scientific knowledge accessible and engaging.

**Highlights:** Interactive science and medicine content, Tools and resources for learning, Blends traditional and modern knowledge, Accessible scientific information, Engaging learning experience

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

**In-app purchases:** none


### ClientOS

[App page](https://appshunter.io/ios/app/clientos/id6774835354)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hatra Doctor free?

Hatra Doctor is free to download, with no in-app purchases.

### Is ClientOS free?

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

### Do Hatra Doctor or ClientOS have ads?

Neither Hatra Doctor nor ClientOS shows ads.

### Which is updated more often, Hatra Doctor or ClientOS?

Hatra Doctor ships an update every 10 days, and ClientOS every 2 days. Most recently, Hatra Doctor was updated on October 19, 2026 and ClientOS on October 25, 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.*