ICM I3 Thermostat vs Thermostat Controller
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ICM I3 Thermostat
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.
- Remote thermostat monitoring
- HVAC system status verification
- Adjust comfort level remotely
- Weekly scheduling
- Vacation/close date settings
- System malfunction alerts
- Energy saving features
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Monitor and adjust your thermostat while away from home. Verify your heating/cooling system is working when you are on vacation. Adjust your comfort level from across the room. Set weekly schedule. Set annual vacation / close dates for schools and businesses.Receive an alert when thermostat or HVAC equipment is not running right. Save money and protect your property. Monitor rental properties. Save energy and protect our planet.
Thermostat Controller
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.
- View current temperature and humidity
- Adjust set temperature
- Change heating/cooling mode
- Control fan settings
- Monitor daily runtime history
- Optional state change notifications
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This app lets you view the data from and control your Venstar thermostat locally. Note: "Locally" refers to the fact that your Venstar thermostat has a local API. This app is interacting with this local API. Meaning, unless you have remote mode enabled and are running the companion app on a computer, then, if your phone isn't connected to the same Wi-Fi network as your thermostat, you won't be able to read from it or control it. Data you can view: * Current temperature * Set temperature * Humidity * Mode (heat, cool, auto) * Fan state * Today’s runtime * Runtime for each day of the past week * The average daily runtime for the past week What you can control: * Increase/decrease the set temperature * Change the mode (heating, cooling, auto) * Change the fan mode (always on or auto) Optional push notifications are available to let you know when the thermostat state changes from idle to active (e.g. heating or cooling) or vice versa. These push notifications require the companion app to be running on a computer as well as an API key. More info here: https://thermostat-controller.studiojq.io/push An optional remote mode is now also available, which lets you view your thermostat data while not on the same Wi-Fi network as the thermostat (i.e. from anywhere). This remote mode requires the companion app to be running on a computer as well as an API key. The remote mode is view only. You cannot control your thermostat remotely. More info here: https://thermostat-controller.studiojq.io/remote Documentation: https://thermostat-controller.studiojq.io
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ICM I3 Thermostat | Thermostat Controller |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 6 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 7.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 54 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | ICM Controls Corp | JASON QUARTZ |
Customer experience
ICM I3 Thermostat
Thermostat Controller
In-app purchases
ICM I3 Thermostat
No in-app purchases
Thermostat Controller
No in-app purchases
Questions
Is ICM I3 Thermostat free?
Is Thermostat Controller free?
Which has better reviews, ICM I3 Thermostat or Thermostat Controller?
Do ICM I3 Thermostat or Thermostat Controller have ads?
Which is updated more often, ICM I3 Thermostat or Thermostat Controller?
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