# STJ79 vs 雷达助手

The clearest difference is iOS requirement: 雷达助手 at 11.0 against STJ79's 15.6. 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.

STJ79 ships an update every 4 months, 雷达助手 every 2 months. The most recent releases landed on October 29, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | STJ79 | 雷达助手 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Size | 14 MB | 2 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [亚男 杨](https://appshunter.io/developer/1485381560) | [泽枫 刘](https://appshunter.io/developer/1662046423) |

## What reviewers say

### STJ79

[App page](https://appshunter.io/ios/app/stj79/id1485381561)

**Features:** macOS Compatibility

**In-app purchases:** none


### 雷达助手

[App page](https://appshunter.io/ios/app/id1618737665)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is STJ79 free?

STJ79 is free to download, with no in-app purchases.

### Is 雷达助手 free?

雷达助手 is free to download, with no in-app purchases.

### Do STJ79 or 雷达助手 have ads?

Neither STJ79 nor 雷达助手 shows ads.

### Which is updated more often, STJ79 or 雷达助手?

STJ79 ships an update every 4 months, and 雷达助手 every 2 months. Most recently, STJ79 was updated on October 29, 2026 and 雷达助手 on November 3, 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.*