# Zelty KDS vs Koust

The clearest difference is update cadence: Koust at every 3 weeks against Zelty KDS's every 4 months. Zelty KDS's advantage is iOS requirement (12.0 vs 15.6). 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.

Zelty KDS ships an update every 4 months, Koust every 3 weeks. The most recent releases landed on September 5, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Zelty KDS | Koust |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Size | 29 MB | 134 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zelty SAS](https://appshunter.io/developer/1063979117) | [KOUST](https://appshunter.io/developer/1475608284) |

## What reviewers say

### Zelty KDS

[App page](https://appshunter.io/ios/app/zelty-kds/id1274982026)

**Features:** macOS Compatibility

**In-app purchases:** none


### Koust

[App page](https://appshunter.io/ios/app/koust/id1475620534)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zelty KDS free?

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

### Is Koust free?

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

### Do Zelty KDS or Koust have ads?

Neither Zelty KDS nor Koust shows ads.

### Which is updated more often, Zelty KDS or Koust?

Zelty KDS ships an update every 4 months, and Koust every 3 weeks. Most recently, Zelty KDS was updated on September 5, 2026 and Koust on September 24, 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.*