# DOS Focus vs Markdown Viewer

The clearest difference is in-app purchases: Markdown Viewer at none against DOS Focus's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. DOS Focus sells 2 in-app purchases, starting at $17.99 per year. Markdown Viewer asks for nothing beyond the download.

DOS Focus ships an update every 3 months, Markdown Viewer every 2 months. The most recent releases landed on September 18, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | DOS Focus | Markdown Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/dos-focus/id6754083210/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Freemium | — |
| Size | 105 MB | 2 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Nguyen Vu Thai](https://appshunter.io/developer/1626985836) | [Mircules](https://appshunter.io/developer/595659821) |

## What reviewers say

### DOS Focus

[App page](https://appshunter.io/ios/app/dos-focus/id6754083210)

Enhance concentration with nostalgic computer sounds and a distraction-free environment. Customize focus sessions, track progress, and personalize your interface with classic DOS themes for improved productivity.

**Highlights:** Retro soundscapes, Customizable focus sessions, Focus progress reports, Classic DOS themes, Offline and minimal design

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Try DOS FOCUS PRO | $17.99 | per year |
| Try DOS FOCUS PRO | $8.99 | one-time |


### Markdown Viewer

[App page](https://appshunter.io/ios/app/markdown-viewer-md-reader/id6760256766)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DOS Focus free?

DOS Focus is free to download, with in-app purchases available.

### Is Markdown Viewer free?

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

### Do DOS Focus or Markdown Viewer have ads?

Neither DOS Focus nor Markdown Viewer shows ads.

### Which is updated more often, DOS Focus or Markdown Viewer?

DOS Focus ships an update every 3 months, and Markdown Viewer every 2 months. Most recently, DOS Focus was updated on September 18, 2026 and Markdown Viewer on October 12, 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.*