# HT400 vs Airfel Scala

The clearest difference is review sentiment: Airfel Scala at 19% against HT400's 0%. HT400's advantage is iOS requirement (8.0 vs 15.1). 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.

HT400 ships an update every 3 months, Airfel Scala every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | HT400 | Airfel Scala |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/ht400/id1289067143/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | **19.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 28 MB | 109 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI](https://appshunter.io/developer/1289067142) | [Daikin Turkiye](https://appshunter.io/developer/1438731783) |

## What reviewers say

### HT400

[App page](https://appshunter.io/ios/app/ht400/id1289067143)

This smart thermostat app allows you to remotely control your home's temperature with precise accuracy. Save on energy bills by creating custom schedules and utilizing intelligent modes. Monitor historical data and manage multiple homes or family members from a single application.

**Highlights:** Remote temperature control worldwide, Daily/weekly program creation, Six distinct control modes, Location-based temperature adjustment, Historical heating reports, Multi-home and family sharing

**Features:** macOS Compatibility

**In-app purchases:** none


### Airfel Scala

[App page](https://appshunter.io/ios/app/airfel-scala/id1503147060)

Control compatible Airfel combi boilers remotely using your smart device. Adjust settings and manage your home's heating system from anywhere.

**Highlights:** Remote boiler control, Smart device integration, Heating system management, Adjustable settings

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

**In-app purchases:** none


## Frequently asked questions

### Is HT400 free?

HT400 is free to download, with no in-app purchases.

### Is Airfel Scala free?

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

### Do HT400 or Airfel Scala have ads?

Neither HT400 nor Airfel Scala shows ads.

### Which is updated more often, HT400 or Airfel Scala?

HT400 ships an update every 3 months, and Airfel Scala every 2 months. Most recently, HT400 was updated on November 3, 2026 and Airfel Scala 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.*