# STJ79 vs Radar Assistant

The clearest difference is update cadence: Radar Assistant at every 4 weeks against STJ79's every 4 months. Radar Assistant also leads on iOS requirement (12.0 vs 15.6). 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.

STJ79 ships an update every 4 months, Radar Assistant every 4 weeks. The most recent releases landed on May 13, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | STJ79 | Radar Assistant |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Size | 14 MB | 50 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [亚男 杨](https://appshunter.io/developer/1485381560) | [荣强 王](https://appshunter.io/developer/1583195280) |

## What reviewers say

### STJ79

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Radar Assistant

[App page](https://appshunter.io/ios/app/radar-assistant/id1540081360)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is STJ79 free?

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

### Is Radar Assistant free?

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

### Do STJ79 or Radar Assistant have ads?

Neither STJ79 nor Radar Assistant shows ads.

### Which is updated more often, STJ79 or Radar Assistant?

STJ79 ships an update every 4 months, and Radar Assistant every 4 weeks. Most recently, STJ79 was updated on May 13, 2026 and Radar Assistant on September 16, 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.*