# TBB BM500 vs Zeliox ZAI4

TBB BM500 and Zeliox ZAI4 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

TBB BM500 ships an update every 6 months, Zeliox ZAI4 every 7 months. The most recent releases landed on May 17, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | TBB BM500 | Zeliox ZAI4 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 7 months |
| Size | 31 MB | 34 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [TBB Power Co., Ltd](https://appshunter.io/developer/1089239531) | [Zeliox](https://appshunter.io/developer/1478320738) |

## What reviewers say

### TBB BM500

[App page](https://appshunter.io/ios/app/tbb-bm500/id1628058089)

**Features:** macOS Compatibility

**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 TBB BM500 free?

TBB BM500 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 TBB BM500 or Zeliox ZAI4 have ads?

Neither TBB BM500 nor Zeliox ZAI4 shows ads.

### Which is updated more often, TBB BM500 or Zeliox ZAI4?

TBB BM500 ships an update every 6 months, and Zeliox ZAI4 every 7 months. Most recently, TBB BM500 was updated on May 17, 2026 and Zeliox ZAI4 on September 7, 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.*