AC Infinity vs Terrestream
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AC Infinity
Control and monitor your smart ventilation systems for HVAC or grow projects. Access advanced programming, track environmental data like temperature and humidity, and receive customizable alerts. Seamlessly pair with compatible devices for comprehensive environmental management.
- Advanced programming (timers, schedules, triggers)
- Real-time temperature and humidity monitoring
- Customizable alarms and push notifications
- Data logging and export
- Wireless control of fan settings
- Scheduled fan automation
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The AC Infinity app enables you to connect with the next generation of our intelligent controllers, giving you access to advanced programs and environmental data. Take control of your next HVAC or grow project using a smart ventilation system and data monitoring. Easily pair this app with one of our compatible devices, available through our website: www.acinfinity.com ADVANCED PROGRAMMING • Get wireless access to essential programming controls including ON and OFF modes, timers, cycles, schedules, and temperature and humidity triggers. • Scheduled fan automation programs enable utmost control over how your fan runs during the day. • Customizable alarms and push notifications help you stay on top of your fan and environment. • Other settings include convertible temperature scales, device brightness, fan speed transitions, and reading calibrations. ENVIRONMENTAL DATA • Gain insight on your space’s temperature and humidity levels using the bar graph distribution view. • The fluctuation charts help you identify extreme high or low points and adjust your fan accordingly. • Climate conditions are regularly tracked by your controller even while you step out, updating this app when you return within its range. • This app records all fan mode activations, alarms, and notifications and logs them in filterable history logs. • Export your temperature and humidity data to your spreadsheet application for greater tracking of your environment.
Terrestream
Monitor your home's indoor air quality and receive actionable guidance. Understand how outdoor conditions impact your air and make informed decisions about ventilation and filtration.
- Real-time indoor air quality readings
- Outdoor condition integration
- Actionable ventilation guidance
- Home screen widgets
- Apple Watch companion app
- Historical air quality data
- Notification history
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UNDERSTAND YOUR AIR. KNOW WHAT TO DO NEXT. Terrestream is the companion app for Terrestream indoor-air sensors. See what is changing in your home, understand the outdoor conditions that matter, and get a practical next step. Before you open a window, Terrestream considers both sides of it. Indoor readings and outdoor air quality, smoke, pollen, and weather help you decide when to ventilate, run filtration, investigate a possible indoor source, or keep watching. YOUR HOME, AT A GLANCE Today brings together your home's Air Index, the room that needs attention, and current guidance. Home Screen widgets put room air, whole-home conditions, window guidance, and comfort within easy reach. Choose the sizes and rooms that suit you, then tap through for more detail. Reading ages and unavailable states help you tell recent information from an older observation. AIR INSIGHTS ON YOUR WRIST The Apple Watch companion makes it easy to check your home and rooms, review window guidance, and follow an airing session. Add Terrestream to your Smart Stack or a supported watch face for quick access. The Watch app works with Terrestream on your iPhone. SEE WHAT CHANGED Compare rooms and explore 8h, 24h, or 7d of history. Inspect actual readings, choose the signals you want to see, and zoom into a change. Air-quality signals and temperature, humidity, and pressure share one timeline, with separate scales. A weekly heat map opens at the latest available reading and helps reveal patterns over time. Notification history brings your recent messages together by room and time. Review the original message and its recorded follow-up without confusing an earlier alert with today's conditions. GUIDANCE THAT FOLLOWS THE EVIDENCE Terrestream connects readings, room differences, and changes over time to explain possible causes and suggest useful actions. It distinguishes a brief rise from continuing accumulation or recovery, and builds ventilation history from independent CO₂ declines. These patterns help guide investigation; they do not identify a specific chemical or prove a ventilation fault. Use the Air view to compare outdoor conditions and forecast windows before bringing outside air in. Temperature and humidity are considered alongside air quality. Wildfire-smoke information and indoor particle readings help inform advice about closing windows and running filtration. READINGS THAT MATTER Follow CO₂, calculated IAQ, particles, VOC and NOx indices, temperature, humidity, pressure, and ambient light. VOC and NOx are relative indices that show changes over time; they do not identify individual chemicals. Pair a compatible sensor over Bluetooth, connect it to Wi-Fi, organize your rooms, and manage notification preferences and device controls. Home Assistant and MQTT integrations connect your sensor with compatible local dashboards and automations. The basic mobile app is included with your sensor. An optional Pro subscription adds longer history and advanced insights. YOUR PRIVACY Location access is optional. See our Privacy Policy for details about the information we collect, how service providers help operate Terrestream, and your privacy choices. WHAT YOU NEED Indoor readings require a compatible Terrestream sensor, sold separately, and a Terrestream account. Cloud features require internet access; the sensor uses 2.4 GHz Wi-Fi and Bluetooth during setup. Outdoor information varies by location, availability, and freshness. Widget refresh timing is managed by the operating system. Terrestream is informational, not a medical or life-safety device. It is not a smoke, fire, carbon monoxide, radon, or gas-leak detector. Keep your required alarms and do not rely on Terrestream in an emergency. Terms & Conditions: https://terrestream.com/legal/terms Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is rating: Terrestream at 5.0 against AC Infinity's 4.2. Terrestream also leads on update cadence (every 3 days vs monthly). AC Infinity's advantage is ratings volume (859 vs 1) and iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and monetization model 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.
Terrestream holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: AC Infinity has 859 ratings behind it against 1, so its average is the more settled of the two.
AC Infinity ships an update monthly, Terrestream every 3 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | AC Infinity | Terrestream |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (859 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 79.4% of reviews | — |
| Number of ratings | 859 — better | 1 |
| Update frequency | Monthly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, Mac, Apple Watch — better |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 377 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | AC Infinity | Terrestream |
Customer experience
AC Infinity
Terrestream
Bugs and requests
AC Infinity
Reported bugs
4 issues- App crashes after firmware updates
- Devices randomly disconnecting from app
- Incorrect data reporting on the app
- Automation settings being reset unexpectedly
Requested features
5 requests- Add Wi-Fi connectivity for remote control
- Improve data visualization and graphing
- Implement more advanced automation options
- Allow custom fan speed and light intensity control
- Add support for day/night mode settings
Terrestream
Not enough reviews yet to summarise bugs or requests.
In-app purchases
AC Infinity
No in-app purchases
Terrestream
No in-app purchases









