# HT400 vs E.C.A. Poly Smart

The clearest difference is iOS requirement: HT400 at 8.0 against E.C.A. Poly Smart's 12.0. On price, review sentiment, update cadence and ads 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, E.C.A. Poly Smart every 4 months. The most recent releases landed on October 6, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | HT400 | E.C.A. Poly Smart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/ht400/id1289067143/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 28 MB | 172 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI](https://appshunter.io/developer/1289067142) | [EMAS MAKINA SANAYI ANONIM SIRKETI](https://appshunter.io/developer/1745114760) |

## 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


### E.C.A. Poly Smart

[App page](https://appshunter.io/ios/app/eca-poly-smart/id6476879062)

Control your home's heating remotely with this smart thermostat application. Set custom schedules, monitor temperature with open window detection, and save on energy bills. Manage multiple properties and share access with family members.

**Highlights:** Remote temperature control, Daily and weekly scheduling, Open window detection, Multiple home management, Family sharing, Comfort, Economy, Holiday modes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HT400 free?

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

### Is E.C.A. Poly Smart free?

E.C.A. Poly Smart is free to download, with no in-app purchases.

### Do HT400 or E.C.A. Poly Smart have ads?

Neither HT400 nor E.C.A. Poly Smart shows ads.

### Which is updated more often, HT400 or E.C.A. Poly Smart?

HT400 ships an update every 3 months, and E.C.A. Poly Smart every 4 months. Most recently, HT400 was updated on October 6, 2026 and E.C.A. Poly Smart on October 1, 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.*