# ICM I3 Thermostat vs Thermostat Controller

The clearest difference is rating: Thermostat Controller at 5.0 against ICM I3 Thermostat's 3.0. Thermostat Controller also leads on update cadence (weekly vs every 6 weeks). ICM I3 Thermostat's advantage is ratings volume (4 vs 1) and device support (3 vs 1). On price, review sentiment, 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.

Thermostat Controller holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

ICM I3 Thermostat ships an update every 6 weeks, Thermostat Controller weekly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | ICM I3 Thermostat | Thermostat Controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (4 ratings)](https://appshunter.io/ios/app/icm-i3-thermostat/id879929074/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/thermostat-controller/id6502414185/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 54 MB | 5 MB |
| Requires iOS | **7.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ICM Controls Corp](https://appshunter.io/developer/879929077) | [JASON QUARTZ](https://appshunter.io/developer/1745379151) |

## What reviewers say

### ICM I3 Thermostat

[App page](https://appshunter.io/ios/app/icm-i3-thermostat/id879929074)

Remotely monitor and control your home's heating and cooling system. Schedule temperature changes, receive alerts for system malfunctions, and save money on energy bills. Ideal for vacation homes or rental properties.

**Highlights:** Remote thermostat monitoring, HVAC system status verification, Adjust comfort level remotely, Weekly scheduling, Vacation/close date settings, System malfunction alerts, Energy saving features

**Features:** macOS Compatibility

**In-app purchases:** none


### Thermostat Controller

[App page](https://appshunter.io/ios/app/thermostat-controller/id6502414185)

Monitor and adjust your Venstar thermostat's temperature, humidity, and fan settings directly from your phone. View current and historical runtime data. Receive optional notifications for state changes.

**Highlights:** View current temperature and humidity, Adjust set temperature, Change heating/cooling mode, Control fan settings, Monitor daily runtime history, Optional state change notifications

**In-app purchases:** none


## Frequently asked questions

### Is ICM I3 Thermostat free?

ICM I3 Thermostat is free to download, with no in-app purchases.

### Is Thermostat Controller free?

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

### Which has better reviews, ICM I3 Thermostat or Thermostat Controller?

Thermostat Controller is rated higher. ICM I3 Thermostat averages 3.0 out of 5 from 4 ratings, while Thermostat Controller averages 5.0 from 1 ratings.

### Do ICM I3 Thermostat or Thermostat Controller have ads?

Neither ICM I3 Thermostat nor Thermostat Controller shows ads.

### Which is updated more often, ICM I3 Thermostat or Thermostat Controller?

ICM I3 Thermostat ships an update every 6 weeks, and Thermostat Controller weekly. Most recently, ICM I3 Thermostat was updated on November 1, 2026 and Thermostat Controller on November 4, 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.*