# Z3US vs Kaster

The clearest difference is ads: Z3US at none against Kaster's shown. Z3US also leads on iOS requirement (9.3 vs 12.4). Kaster's advantage is device support (3 vs 1). On price, update cadence 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.

Z3US ships an update every 2 weeks, Kaster every 3 weeks. The most recent releases landed on September 29, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Z3US | Kaster |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Size | 359 MB | 91 MB |
| Requires iOS | **9.3** | 12.4 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GAMA - SOLUCOES EM TECNOLOGIA LTDA - ME](https://appshunter.io/developer/972097065) | [Douglas Villar](https://appshunter.io/developer/1469157492) |

## What reviewers say

### Z3US

[App page](https://appshunter.io/ios/app/z3us/id1409120961)

**Features:** macOS Compatibility

**In-app purchases:** none


### Kaster

[App page](https://appshunter.io/ios/app/kaster-vendas-e-pedidos/id6475139940)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Z3US free?

Z3US is free to download, with no in-app purchases.

### Is Kaster free?

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

### Do Z3US or Kaster have ads?

Kaster shows ads; Z3US does not.

### Which is updated more often, Z3US or Kaster?

Z3US ships an update every 2 weeks, and Kaster every 3 weeks. Most recently, Z3US was updated on September 29, 2026 and Kaster on September 10, 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.*