Winner
Updated September 2026
Data from Amazon and official Aranet and Sonoff sites.
2026 verdict
Battery CO2 meter or Matter sensor? The Aranet4 HOME is the better CO2 monitor of these two, with a 4-year battery, an air pressure reading and owners who call it the most accurate they have used.
It also brings a clear E-Ink screen and a 2-year warranty, and it fits in a pocket. The SONOFF SAWF-08P Air Quality Monitor is the lower priced and far better connected option: mains powered, on Wi-Fi with native Matter, so it works with Apple Home, Alexa, Google Home, SmartThings and Home Assistant, and it keeps a year of history. Choose the Aranet4 HOME for accuracy and portability, and the SONOFF SAWF-08P Air Quality Monitor for a fixed spot wired into a Matter smart home.
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| Feature | Aranet4 HOME | SONOFF SAWF-08P Air Quality Monitor | Winner |
|---|---|---|---|
| Price | €199.00 | $49.90 | SONOFF SAWF-08P Air Quality Monitor |
| Rating | 4.7 | 4.3 | Aranet4 HOME |
| Integrations | Home Assistant | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | SONOFF SAWF-08P Air Quality Monitor |
| Sensors | CO2, Temperature, Humidity, Atmospheric Pressure | CO2, Temperature, Humidity | Aranet4 HOME |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts | Aranet4 HOME |
| Weather Resistance | NO | NO | Tie |
| Connectivity | Bluetooth | 2.4 GHz WiFi | Tie |
| Screen | YES | YES | Tie |
What the differences mean
Smart home
The SONOFF SAWF-08P Air Quality Monitor speaks Matter over Wi-Fi, so it joins Apple Home, Alexa, Google Home, SmartThings and Home Assistant without a hub. The Aranet4 HOME is Bluetooth only and works with Home Assistant alone.
Power
The Aranet4 HOME runs on two AA batteries rated for 4 years and goes anywhere. The SONOFF SAWF-08P Air Quality Monitor is mains powered, so there are no batteries to swap but it stays by an outlet.
Sensors
Both read CO2, temperature and humidity. The Aranet4 HOME adds atmospheric pressure; neither measures particulates or VOCs.
Display
The Aranet4 HOME uses an E-Ink screen that reads well in any light. The SONOFF SAWF-08P Air Quality Monitor has a larger LCD that owners find clear head on but hard to read from off angles.
History
The SONOFF SAWF-08P Air Quality Monitor keeps a year of exportable history. The Aranet4 HOME keeps history in its Bluetooth app, synced when the phone is in range.
Which one to buy if
- your home runs on Apple Home or Matter
The SONOFF SAWF-08P Air Quality Monitor joins Apple Home and every other Matter controller directly.
- you want to carry it between rooms or on trips
The Aranet4 HOME is battery powered and pocket-sized.
- accuracy matters more than connectivity
Owners describe the Aranet4 HOME's NDIR sensor as reading close to reference instruments, and it can be recalibrated.
- you want a fan to switch on when CO2 rises
The SONOFF SAWF-08P Air Quality Monitor reports to any Matter platform, so automations are easy to build.
Winner
- + Rating: 4.7
- + Sensors: CO2, Temperature, Humidity, Atmospheric Pressure
- + Alerts: Temperature Alerts, Humidity Alerts, Air Quality Alerts, Low Battery Alerts
- - Price: €199.00 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 4.7
- - Sensors: CO2, Temperature, Humidity vs CO2, Temperature, Humidity, Atmospheric Pressure
What owners say
Owners of both CO2 monitors bought them to watch ventilation, and both groups report readings that track well against reference meters, with fresh-air exposure used to reset a drifting baseline. Aranet4 HOME owners praise a crisp E-Ink screen, batteries that last years and a pocketable size, and complain about the price, Bluetooth-only range and a few minutes of settling after moving it. SONOFF SAWF-08P Air Quality Monitor owners single out painless setup through the eWeLink app or Matter, a large display that updates fast and mains power that means no batteries, and their complaints are a USB-C socket on the back that makes wall mounting impractical, no manual calibration control, a screen hard to read from an angle and occasional trouble joining a Matter network.
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.
- Aranet4 HOME
- SONOFF SAWF-08P Air Quality Monitor
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Frequently Asked Questions
Which is better overall: Aranet4 HOME or SONOFF SAWF-08P Air Quality Monitor?
The Aranet4 HOME, for its trusted accuracy, 4-year battery, pressure sensor and E-Ink screen. The SONOFF SAWF-08P Air Quality Monitor is the lower priced option and the one to buy for Matter, Apple Home or Alexa.
Which is more precise, the Aranet4 HOME or the SONOFF SAWF-08P?
Both use NDIR CO2 sensors. The SONOFF SAWF-08P Air Quality Monitor is rated at plus or minus 50 ppm plus 5 percent, and owners found it tracks a reference well. Aranet4 HOME owners describe it as the most trustworthy CO2 monitor they have used and can recalibrate it, while the SONOFF has no manual calibration control.
What is the biggest difference between the Aranet4 HOME and the SONOFF SAWF-08P Air Quality Monitor?
Connection and power. The Aranet4 HOME is a battery-powered Bluetooth device, and the SONOFF SAWF-08P Air Quality Monitor is a mains-powered Wi-Fi device with native Matter.
Do both work with Home Assistant?
Yes. The Aranet4 HOME connects over Bluetooth, and the SONOFF SAWF-08P Air Quality Monitor over Wi-Fi and Matter, which also brings Apple Home, Alexa, Google Home and SmartThings.
Who should buy the Aranet4 HOME?
Anyone who wants a portable, accurate CO2 monitor that runs for years on batteries, reads well in any light and also tracks air pressure.
Who should buy the SONOFF SAWF-08P Air Quality Monitor?
Matter and Home Assistant households that want a mains-powered CO2 monitor with a large display, a year of history and automations on any platform.
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
AranetRadon Plus
$209.00- Aranet
Aranet4 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)