# W vs Zark Update

The clearest difference is iOS requirement: Zark Update at 13.0 against W's 15. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 11, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | W | Zark Update |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 45 MB | 27 MB |
| Requires iOS | 15 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LumenRadio AB](https://appshunter.io/developer/1443137236) | [SEC of America Incorporated](https://appshunter.io/developer/894019771) |

## What reviewers say

### W

[App page](https://appshunter.io/ios/app/w-modbus/id6472275984)

**Features:** macOS Compatibility

**In-app purchases:** none


### Zark Update

[App page](https://appshunter.io/ios/app/zark-update/id6673909377)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is W free?

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

### Is Zark Update free?

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

### Do W or Zark Update have ads?

Neither W nor Zark Update shows ads.

### Which is updated more often, W or Zark Update?

W ships an update every 2 months, and Zark Update every 2 months. Most recently, W was updated on September 11, 2026 and Zark Update on September 17, 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.*