# Zeliox ZAI4 vs TBB Service

The clearest difference is update cadence: TBB Service at every 5 weeks against Zeliox ZAI4's every 7 months. 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.

Zeliox ZAI4 ships an update every 7 months, TBB Service every 5 weeks. The most recent releases landed on September 7, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Zeliox ZAI4 | TBB Service |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 5 weeks** |
| Size | 34 MB | 30 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Zeliox](https://appshunter.io/developer/1478320738) | [TBB Power Co., Ltd](https://appshunter.io/developer/1089239531) |

## What reviewers say

### Zeliox ZAI4

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

**Features:** macOS Compatibility

**In-app purchases:** none


### TBB Service

[App page](https://appshunter.io/ios/app/tbb-service/id6772071723)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zeliox ZAI4 free?

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

### Is TBB Service free?

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

### Do Zeliox ZAI4 or TBB Service have ads?

Neither Zeliox ZAI4 nor TBB Service shows ads.

### Which is updated more often, Zeliox ZAI4 or TBB Service?

Zeliox ZAI4 ships an update every 7 months, and TBB Service every 5 weeks. Most recently, Zeliox ZAI4 was updated on September 7, 2026 and TBB Service on September 9, 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.*