# HT400 > Smart thermostat app for remote home temperature control and energy savings. (iPhone/iPad app by ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI.) - Source: https://appshunter.io/ios/app/ht400/id1289067143 (this page in markdown: same URL + `.md`) - Developer: [ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI](https://appshunter.io/developer/1289067142) - Category: Utilities, Lifestyle - Price: Free - Rating: 1.00/5 from 1 App Store ratings · 3 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 28 MB - Languages: American English, Croatian, Czech, Danish, Romanian, Serbian, Turkish - Released: 2017-12-02 - Data updated: 2026-06-01 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/ht400/id1289067143/reviews.md ## What is HT400? How does HT 400 SMART ROOM THERMOSTAT WORKS? HT 400 Smart room thermostat with its 0,1-degree​ measurement accuracy sets your home temperature via application as you desired. You can save up to %30 of your gas bill by preventing boiler work unnecessary. What are the advantages of HT 400 Smart Room Thermostat? - With Smart room thermostat, you can control your home temperature by app wherever you are in the world. - Create daily or weekly programs easily by your Smart Room Thermostat App. - You can choose one of the 6 different modes which suit your situation and control your home temperature. (Home Mode-Sleep Mode-Outside Mode-Program Mode-Location Mode-Manual Mode) - Using Location Mode reduces the temperature of your home when you move away from home or increases the temperature when you approach your home. - Depending on the date range selected from the smart room thermostat's mobile application, you can get a historical report of your heating unit's working hours, the temperature of your home and the outside temperature gracefully. - You can add more than one home to your app and can control all with one app. - You can invite your family members to app and share control of your home. - HT 400 Smart Room Thermostat is only compatible with On/Off boilers. ## Key features - Remote temperature control worldwide - Daily/weekly program creation - Six distinct control modes - Location-based temperature adjustment - Historical heating reports - Multi-home and family sharing ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/ht400/id1289067143/reviews.md ### 1/5 — İnternet bağlantısı hatası *2025-12-30, version 1.1.3* Cihaza bağlanmıyor internet bağlantısı yok diye herselerinde bununla uğraşıyorum başa bela ### 1/5 — Really bad *2025-01-25* The app stopped working and now we have no heating! ### 1/5 — Not working after update *2019-02-02, version 1.0.6* Today update just arrived and thermostat does not work anymore. I can not connect to it. ## Frequently asked questions about HT400 ### How accurate is the HT400 thermostat? The HT400 Smart room thermostat boasts an impressive 0.1-degree measurement accuracy, ensuring precise control over your home's temperature as desired. ### Can I save money on my energy bills with HT400? Yes, by preventing unnecessary boiler work, the HT400 Smart Room Thermostat can help you save up to 30% on your gas bill. ### What modes does the HT400 app offer? The HT400 app provides six different modes to suit your situation: Home Mode, Sleep Mode, Outside Mode, Program Mode, Location Mode, and Manual Mode. ### Does HT400 work with any boiler? The HT400 Smart Room Thermostat is specifically compatible only with On/Off boilers. ### Can I control multiple homes with the HT400 app? Yes, you can add more than one home to your HT400 app and control all of them with a single application. ### Is HT400 available on Android devices? Based on the provided data, HT400 is supported on iPhone and iPod devices. Compatibility with Android is not specified. ### How often is HT400 updated? The latest version of HT400 is 1.1.3, which was last updated on October 25, 2020. This indicates a less frequent update cycle. ### What is the user rating for HT400? HT400 has a rating of 1.0 stars from 1 rating. This suggests a very limited number of reviews and potentially a poor user experience based on the available data. ## Version history (last 5 releases) ### 1.1.3 — 2020-10-25 Performance improvements were made. ### 1.1.2 — 2020-10-12 Performance improvements were made ### 1.1.1 — 2020-05-19 Performance Improvements Made. ### 1.1.0 — 2020-01-16 Czech and Serbian language support added. Performance improvements. ### 1.0.9 — 2019-07-04 Performance issues fix. ## Apps similar to HT400 | App | Rating | Price | Category | | --- | --- | --- | --- | | [InterraX](https://appshunter.io/ios/app/interrax/id6742403750) | 5.0 (1) | Free | Utilities | | [Mars Electric](https://appshunter.io/ios/app/mars-electric/id1544938989) | — | Free | Utilities | | [Wifi Network Finder](https://appshunter.io/ios/app/wifi-network-finder/id6744857179) | — | Free | Utilities | | [AlpSmart](https://appshunter.io/ios/app/alpsmart/id1364722837) | 5.0 (3) | Free | Utilities | | [Recowa](https://appshunter.io/ios/app/recowa/id1473732465) | — | Free | Utilities | | [oinvo](https://appshunter.io/ios/app/oinvo/id1619740680) | — | Free | Utilities | ## More apps by ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI - [AC400](https://appshunter.io/ios/app/ac400/id1381528106) - [MOTAN](https://appshunter.io/ios/app/motan/id1451422303) - [Conter Smart](https://appshunter.io/ios/app/conter-smart/id1483921322) - [mC HT500SET](https://appshunter.io/ios/app/mc-ht500set/id1489433682) - [mC HT400](https://appshunter.io/ios/app/mc-ht400/id1490120462) All apps by ISIPARK IC VE DIS TICARET INSAAT ISITMA SISTEMLERI OTOMOTIV SANAYI ANONIM SIRKETI: https://appshunter.io/developer/1289067142 ## Related topics [ht400](https://appshunter.io/ios/topics/ht400) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*