# i3 KNX vs ST4U

The clearest difference is update cadence: ST4U at every 3 weeks against i3 KNX's every 2 months. i3 KNX's advantage is iOS requirement (11.0 vs 15.1). 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.

i3 KNX ships an update every 2 months, ST4U every 3 weeks. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | i3 KNX | ST4U |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 53 MB | 35 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iRidium Ltd.](https://appshunter.io/developer/1050642680) | [HePoJ](https://appshunter.io/developer/1596658297) |

## What reviewers say

### i3 KNX

[App page](https://appshunter.io/ios/app/i3-knx/id1497857592)

Control your KNX smart home, office, or hotel automation system from a single interface. Integrate cameras, intercoms, and multimedia for comprehensive management. Create timers, schedules, and utilize voice control for seamless automation.

**Highlights:** KNX system integration, Camera and intercom integration, Timer and schedule creation, Voice control capabilities, Secure remote access, Fast project setup

**Features:** macOS Compatibility

**In-app purchases:** none


### ST4U

[App page](https://appshunter.io/ios/app/st4u/id1596658055)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is i3 KNX free?

i3 KNX is free to download, with no in-app purchases.

### Is ST4U free?

ST4U is free to download, with no in-app purchases.

### Do i3 KNX or ST4U have ads?

Neither i3 KNX nor ST4U shows ads.

### Which is updated more often, i3 KNX or ST4U?

i3 KNX ships an update every 2 months, and ST4U every 3 weeks. Most recently, i3 KNX was updated on October 16, 2026 and ST4U on October 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.*