Winner
Updated October 2026
Data from the official Airthings and Aranet sites.
2026 verdict
Portable CO2 meter or whole-home air station?
The Airthings View Plus is the more complete air quality monitor here, adding radon, PM2.5 and VOCs plus Wi-Fi to the CO2 both measure. It also works with Google Home and Alexa as well as Home Assistant, and carries a 5-year warranty against 2. The Aranet4 HOME is the focused alternative: a small, light E-Ink meter for CO2, temperature, humidity and pressure, rated for 4 years on two AA batteries against 2 years on six for the Airthings View Plus, with owners who rank its CO2 sensor among the most trustworthy. Both have E-Ink screens. Choose the Airthings View Plus to watch a whole home's air remotely, and the Aranet4 HOME to track ventilation wherever you carry it.
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| Feature | Airthings View Plus | Aranet4 HOME | Winner |
|---|---|---|---|
| Price | $329.99 | $189.00 | Aranet4 HOME |
| Rating | 4.0 | 4.7 | Aranet4 HOME |
| Warranty | 5 years | 2 years | Airthings View Plus |
| Battery Life | 2 years | 4 years | Aranet4 HOME |
| Connectivity | 2.4 GHz WiFi, Bluetooth, Other | Bluetooth | Airthings View Plus |
| Integrations | Google Home, Alexa, Home Assistant | Home Assistant | Airthings View Plus |
| Sensors | TVOC, PM2.5, CO2, Radon, Temperature, Humidity, Atmospheric Pressure | CO2, Temperature, Humidity, Atmospheric Pressure | Airthings View Plus |
| Weather Resistance | NO | NO | Tie |
| Screen | YES | YES | Tie |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Tie |
What the differences mean
What it measures
Both track CO2, temperature, humidity and air pressure. The Airthings View Plus adds radon, PM2.5 and TVOC, so it also catches a radon problem, wildfire smoke and cooking fumes that the Aranet4 HOME cannot see.
Remote access
The Airthings View Plus is on Wi-Fi and sends alerts anywhere. The Aranet4 HOME is Bluetooth only, so you read its history with a phone nearby, or through Home Assistant.
Size and power
The Aranet4 HOME weighs 104 g and runs up to 4 years on two AA cells, which makes it a travel companion. The Airthings View Plus weighs 360 g, takes six AA cells for about 2 years or USB-C power, and is meant to stay on a shelf or wall.
Smart home
Google Home, Alexa and Home Assistant all work with the Airthings View Plus. The Aranet4 HOME connects to Home Assistant only.
Which one to buy if
- you live in a radon-prone area
The Airthings View Plus measures radon; the Aranet4 HOME does not.
- you want a CO2 meter to carry to work or on trips
The Aranet4 HOME is small, light and lasts years on two AA batteries.
- smoke, dust or cooking fumes are a concern
Only the Airthings View Plus has PM2.5 and VOC sensors.
- you want alerts while you are away
The Airthings View Plus is on Wi-Fi; the Aranet4 HOME needs a phone within Bluetooth range.
Winner
$329.99
- + Warranty: 5 years
- + Connectivity: 2.4 GHz WiFi, Bluetooth, Other
- + Integrations: Google Home, Alexa, Home Assistant
- - Price: $329.99 vs $189.00
- - Rating: 4.0 vs 4.7
$189.00
- + Price: $189.00
- + Rating: 4.7
- + Battery Life: 4 years
- - Warranty: 2 years vs 5 years
- - Connectivity: Bluetooth vs 2.4 GHz WiFi, Bluetooth, Other
What owners say
Owners of both use them to see CO2 build up in a closed room and to decide when to air it out. Airthings View Plus owners single out getting radon, PM2.5 and VOCs in the same unit, Wi-Fi alerts and a dashboard with exportable history, and their complaints are a CO2 sensor that drifts high without fresh air, fixed alert thresholds and an unlit screen. Aranet4 HOME owners describe CO2 readings close to reference instruments, a crisp display and batteries that last years in a device small enough for a pocket, and they mention a few minutes to settle after moving, the occasional one-time calibration and Bluetooth range with no remote access.
Frequently Asked Questions
Airthings vs Aranet: is the Airthings View Plus or the Aranet4 HOME better?
The Airthings View Plus for whole-home monitoring, since it adds radon, PM2.5, VOCs and Wi-Fi. The Aranet4 HOME is the better pick if all you need is accurate, portable CO2 tracking.
What is the biggest difference between the Airthings View Plus and the Aranet4 HOME?
Scope. The Airthings View Plus is a seven-sensor Wi-Fi station covering radon, PM2.5, CO2, VOCs, temperature, humidity and pressure. The Aranet4 HOME is a Bluetooth CO2 meter that also reads temperature, humidity and pressure.
Which has the longer battery life, the Airthings View Plus or the Aranet4 HOME?
The Aranet4 HOME, rated for 4 years on two AA batteries. The Airthings View Plus is rated for 2 years on six AA batteries, and can also run from USB-C.
Who should buy the Airthings View Plus?
Homeowners who want radon and full indoor air quality in one Wi-Fi device, with alerts anywhere and support for Google Home, Alexa and Home Assistant.
Who should buy the Aranet4 HOME?
Anyone focused on CO2 and ventilation who wants trusted readings on a screen and a meter light enough to move from room to room or take travelling.
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