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. Timing ventilation around outdoor conditions can also help you avoid unnecessary heating or cooling.

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 a room and tap through for more detail. Reading ages and unavailable states help you tell recent information from an older observation.

SEE WHAT CHANGED

Compare rooms in separate 24-hour CO₂, IAQ, VOC, and NOx charts. Each room keeps the same color across charts, and gaps remain visible when readings are missing. Open a chart to explore the trend in more detail.

Explore 8h, 24h, or 7d of room history. Inspect actual readings, choose the signals you want to see, and zoom into a change. A weekly heat map helps reveal patterns over time. Notification history brings recent messages together by room and time.

GUIDANCE THAT FOLLOWS THE EVIDENCE

Terrestream connects readings, room differences, and changes over time to explain possible causes and suggest useful actions. It can distinguish a brief rise from continuing accumulation or recovery. 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, PM1.0, PM2.5, PM4.0, PM10, 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.

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. Connected 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 Android.

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.

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