# STJ79 vs GuardTune

The clearest difference is iOS requirement: GuardTune at 13.0 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, GuardTune every 3 months. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | STJ79 | GuardTune |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Size | 14 MB | 164 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [亚男 杨](https://appshunter.io/developer/1485381560) | [Shenzhen Daozhixing Technology Co., Ltd](https://appshunter.io/developer/1756638336) |

## What reviewers say

### STJ79

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

**Features:** macOS Compatibility

**In-app purchases:** none


### GuardTune

[App page](https://appshunter.io/ios/app/guardtune/id6532589181)

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

**In-app purchases:** none


## Frequently asked questions

### Is STJ79 free?

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

### Is GuardTune free?

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

### Do STJ79 or GuardTune have ads?

Neither STJ79 nor GuardTune shows ads.

### Which is updated more often, STJ79 or GuardTune?

STJ79 ships an update every 4 months, and GuardTune every 3 months. Most recently, STJ79 was updated on October 4, 2026 and GuardTune on October 2, 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.*