# Tousek TST100 vs Zeliox ZAI4

The clearest difference is iOS requirement: Zeliox ZAI4 at 12.0 against Tousek TST100's 15.0. 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.

Tousek TST100 ships an update every 4 months, Zeliox ZAI4 every 7 months. Both last shipped on October 27, 2026.

## The numbers

| Metric | Tousek TST100 | Zeliox ZAI4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Size | 36 MB | 34 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [tousek Ges.m.b.H](https://appshunter.io/developer/1599726875) | [Zeliox](https://appshunter.io/developer/1478320738) |

## What reviewers say

### Tousek TST100

[App page](https://appshunter.io/ios/app/tousek-tst100/id6448426822)

**In-app purchases:** none


### Zeliox ZAI4

[App page](https://appshunter.io/ios/app/zeliox-zai4/id6737747373)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Tousek TST100 free?

Tousek TST100 is free to download, with no in-app purchases.

### Is Zeliox ZAI4 free?

Zeliox ZAI4 is free to download, with no in-app purchases.

### Do Tousek TST100 or Zeliox ZAI4 have ads?

Neither Tousek TST100 nor Zeliox ZAI4 shows ads.

### Which is updated more often, Tousek TST100 or Zeliox ZAI4?

Tousek TST100 ships an update every 4 months, and Zeliox ZAI4 every 7 months. Most recently, Tousek TST100 was updated on October 27, 2026 and Zeliox ZAI4 on October 27, 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.*