# Metis OS vs Marko

The clearest difference is update cadence: Marko at every 6 days against Metis OS's fortnightly. Metis OS's advantage is iOS requirement (16.0 vs 18.0). 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.

Metis OS ships an update fortnightly, Marko every 6 days. The most recent releases landed on October 17, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Metis OS | Marko |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 6 days** |
| Size | 1 MB | 19 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Christian Daniel Johnson](https://appshunter.io/developer/1759691186) | [Yash Banka](https://appshunter.io/developer/1458782628) |

## What reviewers say

### Metis OS

[App page](https://appshunter.io/ios/app/metis-os-tactical/id6581486072)

**Features:** macOS Compatibility

**In-app purchases:** none


### Marko

[App page](https://appshunter.io/ios/app/marko-markdown-viewer/id6797180877)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Metis OS free?

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

### Is Marko free?

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

### Do Metis OS or Marko have ads?

Neither Metis OS nor Marko shows ads.

### Which is updated more often, Metis OS or Marko?

Metis OS ships an update fortnightly, and Marko every 6 days. Most recently, Metis OS was updated on October 17, 2026 and Marko on October 19, 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.*