Winner
Updated September 2026
Data from Amazon and official Aranet and Sonoff sites.
2026 verdict
Basement radon or bedroom CO2? The Aranet Radon Plus is the stronger monitor of the pair, a radon detector with a 7-year battery that also reads air pressure.
It updates radon every 10 minutes on an E-Ink screen, carries a 2-year warranty, and works with Home Assistant over Bluetooth. The SONOFF SAWF-08P Air Quality Monitor is the lower priced option and measures a different gas, CO2, with native Matter over Wi-Fi that brings Apple Home, Alexa, Google Home, SmartThings and Home Assistant, plus a year of history. Neither measures what the other does. Buy the Aranet Radon Plus to watch radon in a basement or radon-prone home, and the SONOFF SAWF-08P Air Quality Monitor to track ventilation in a Matter smart home.
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| Feature | Aranet Radon Plus | SONOFF SAWF-08P Air Quality Monitor | Winner |
|---|---|---|---|
| Price | $209.00 | $49.90 | SONOFF SAWF-08P Air Quality Monitor |
| Rating | 4.8 | 4.3 | Aranet Radon Plus |
| Integrations | Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | SONOFF SAWF-08P Air Quality Monitor |
| Sensors | Radon, Temperature, Humidity, Atmospheric Pressure | CO2, Temperature, Humidity | Aranet Radon Plus |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts | Aranet Radon Plus |
| Weather Resistance | IP20 | NO | Different strengths |
| Connectivity | Bluetooth | 2.4 GHz WiFi | Tie |
| Screen | YES | YES | Tie |
What the differences mean
What it measures
The Aranet Radon Plus measures radon, temperature, humidity and pressure. The SONOFF SAWF-08P Air Quality Monitor measures CO2, temperature and humidity. The choice comes down to which gas you need to watch.
Smart home
The SONOFF SAWF-08P Air Quality Monitor supports Matter over Wi-Fi, so it works with Apple Home, Alexa, Google Home, SmartThings and Home Assistant. The Aranet Radon Plus is Bluetooth only and works with Home Assistant alone.
Power
The Aranet Radon Plus runs on two AA batteries rated for 7 years, so it can sit in a basement corner with no outlet. The SONOFF SAWF-08P Air Quality Monitor is mains powered.
Automations
The SONOFF SAWF-08P Air Quality Monitor supports automations on any Matter platform. The Aranet Radon Plus has no automation support of its own; owners build radon alerts through Home Assistant.
Which one to buy if
- you need to know your radon level
The Aranet Radon Plus measures radon every 10 minutes; the SONOFF does not measure it.
- your home office gets stuffy
The SONOFF SAWF-08P Air Quality Monitor tracks CO2, the gas that builds up in closed rooms.
- Apple Home or another Matter controller runs your home
The SONOFF joins any Matter platform without a hub.
- there is no outlet where it needs to sit
The Aranet Radon Plus runs for years on two AA batteries.
Winner
$209.00
- + Rating: 4.8
- + Sensors: Radon, Temperature, Humidity, Atmospheric Pressure
- + Alerts: Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts
- - Price: $209.00 vs $49.90
- - Integrations: Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
- + Price: $49.90
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
- - Rating: 4.3 vs 4.8
- - Sensors: CO2, Temperature, Humidity vs Radon, Temperature, Humidity, Atmospheric Pressure
What owners say
Owners of both monitors say setup was easy and that the readings hold up against a lab test or a reference meter, and both groups mention that the sensor needs time or fresh air to settle. Aranet Radon Plus owners use it to see radon respond to windows and HVAC and to confirm a mitigation system works, and praise the multi-year battery and Home Assistant support; their caveats are the price, Bluetooth range from a basement and no cloud sync. SONOFF SAWF-08P Air Quality Monitor owners single out quick commissioning into Matter, a large, fast display and mains power, and complain about a rear USB-C socket that rules out flat wall mounting, no manual calibration and a screen hard to read at an angle.
Price history compared
Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.
- Aranet Radon Plus
- SONOFF SAWF-08P Air Quality Monitor
Loading price history...
Frequently Asked Questions
Which is better overall: Aranet Radon Plus or SONOFF SAWF-08P Air Quality Monitor?
For radon, the Aranet Radon Plus, the better rated of the two with a 7-year battery and an E-Ink screen. The SONOFF SAWF-08P Air Quality Monitor is the lower priced choice for CO2 in a Matter smart home.
What is the biggest difference between the Aranet Radon Plus and the SONOFF SAWF-08P Air Quality Monitor?
The gas they measure. The Aranet Radon Plus measures radon, and the SONOFF SAWF-08P Air Quality Monitor measures CO2. Both also read temperature and humidity.
Does the SONOFF SAWF-08P measure radon?
No. The SONOFF SAWF-08P Air Quality Monitor measures CO2, temperature and humidity. For radon you need a monitor like the Aranet Radon Plus.
Which works with Apple Home?
The SONOFF SAWF-08P Air Quality Monitor, through Matter over Wi-Fi. The Aranet Radon Plus works only with Home Assistant over Bluetooth.
Who should buy the Aranet Radon Plus?
Homeowners with a basement or in a radon-prone area who want fast, accurate radon readings on a battery that lasts years.
Who should buy the SONOFF SAWF-08P Air Quality Monitor?
Matter and Home Assistant households that want a mains-powered CO2, temperature and humidity monitor with a large display and a year of history.
Full comparison table
Compare all 32 Air Quality Monitors side by side
You are looking at two of them. The full table lines up all Air Quality Monitors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 32 Air Quality Monitors
- 54 specs compared
- 50 filters
- Aranet
Radon Plus
$209.00 
AranetAranet4 HOME
€199.00
AranetRadon One
$179.00
AranetRadiation
$139.00
EcobeeSmart Thermostat Premium
27% OFF$204.97$149.63
Airthings325 Corentium Home 2
$179.99
GoveeSmart Air Quality Monitor CO2 H5140
22% OFF$89.99$69.99
Third RealitySmart Air Quality Sensor
$49.99
Airthings2950 Wave Radon
$109.15
X-SenseXR0A-iR Wi-Fi Radon Detector
$99.99
GoveeSmart Air Quality Monitor
13% OFF$45.99$39.98
SonoffSAWF-08P Air Quality Monitor
$49.90
AmazonSmart Air Quality Monitor
33% OFF$69.99$46.99
AirthingsWave Plus
$249.99
Airthings2989 View Radon
$219.99
AirthingsWave Enhance
16% OFF$159.99$134.43
AirthingsView Plus
$329.99
AirthingsWave Mini
$89.99
IQAirAirVisual Pro
$329.99
EveRoom
$109.95
Air Quality MonitorsSonoffSAWF-07P Air Quality Monitor
3.7(192)$39.90- Air Quality MonitorsSonoff
SAWF-08P Air Quality Monitor
4.3(168)$49.90 
CamerasSonoffCAM GlassView
4.6(19)$34.90
CamerasSonoffCam Outdoor DUO
$79.90
CamerasSonoffCam Slim Gen2
4.4(172)$19.90
CamerasSonoffGK-200MP2-B
4.0(149)30% OFF$9.99$6.99
DisplaysSonoffNSPanel Pro Gen2
3.4(11)€149.90
DisplaysSonoffNSPanel Pro
4.1(73)$129.90
DonglesSonoffDongle Lite MG21
4.5(444)$24.90
DonglesSonoffDongle Max
4.3(603)
DonglesSonoffDongle Plus MG24
4.7(680)$35.90
DonglesSonoffDongle Plus PP10
4.6(95)$35.90
DonglesSonoffDongle-PZG23
4.6(174)$39.90
DonglesSonoffZ-Wave 800 PoE Dongle Max
4.4(22)$44.90
DonglesSonoffZBDongle-E
4.6(3,731)$24.90
DonglesSonoffZBDongle-P
4.6(5,668)17% OFF$39.99$33.39
Door & Window SensorsSonoffDW2-WIFI
3.8(1,057)$12.23
Door & Window SensorsSonoffSNZB-04 ZigBee Wireless Door/Window Sensor
3.7(101)$17.99
Door & Window SensorsSonoffSNZB-04P ZigBee Door/Window Sensor
4.0(13)$18.99
Door & Window SensorsSonoffSenseGuard DW Gen2
4.4(195)