# HDL On vs Salus 4.0

The clearest difference is update cadence: HDL On at every 2 weeks against Salus 4.0's every 6 weeks. HDL On also leads on iOS requirement (9.1 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.

HDL On ships an update every 2 weeks, Salus 4.0 every 6 weeks. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | HDL On | Salus 4.0 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (9 ratings)](https://appshunter.io/ios/app/hdl-on/id1029839624/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Free | — |
| Size | 128 MB | 33 MB |
| Requires iOS | **9.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [HDL Automation Co., Ltd](https://appshunter.io/developer/1256347409) | [Qbler Technolabs](https://appshunter.io/developer/1463382503) |

## What reviewers say

### HDL On

[App page](https://appshunter.io/ios/app/hdl-on/id1029839624)

This utility app allows users to search for and control various network equipment, including lighting, curtains, and HVAC systems. It offers a centralized platform for managing smart home devices.

**Highlights:** Search network equipment, Control lighting, Manage curtains, HVAC system control, Panel equipment management

**Features:** macOS Compatibility

**In-app purchases:** none


### Salus 4.0

[App page](https://appshunter.io/ios/app/salus-40/id6670528994)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HDL On free?

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

### Is Salus 4.0 free?

Salus 4.0 is free to download, with no in-app purchases.

### Do HDL On or Salus 4.0 have ads?

Neither HDL On nor Salus 4.0 shows ads.

### Which is updated more often, HDL On or Salus 4.0?

HDL On ships an update every 2 weeks, and Salus 4.0 every 6 weeks. Most recently, HDL On was updated on November 1, 2026 and Salus 4.0 on October 30, 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.*