# Việt MOS vs Retudy

The clearest difference is update cadence: Retudy at fortnightly against Việt MOS's every 8 months. Retudy also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.

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

Việt MOS ships an update every 8 months, Retudy fortnightly. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Việt MOS | Retudy |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Size | 84 MB | 42 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | — | **iPhone, iPad** |
| Age rating | 17+ | 17+ |
| Developer | [Tho Trong Nguyen](https://appshunter.io/developer/1093690555) | [DIGITAL FIDELITY VIETNAM JOINT STOCK COMPANY](https://appshunter.io/developer/1839866645) |

## What reviewers say

### Việt MOS

[App page](https://appshunter.io/ios/app/viet-mos/id6503328201)

**In-app purchases:** none


### Retudy

[App page](https://appshunter.io/ios/app/retudy/id6746403711)

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

**In-app purchases:** none


## Frequently asked questions

### Is Việt MOS free?

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

### Is Retudy free?

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

### Which is updated more often, Việt MOS or Retudy?

Việt MOS ships an update every 8 months, and Retudy fortnightly. Most recently, Việt MOS was updated on November 4, 2026 and Retudy 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.*