Aranet Aranet4 Pro vs Airthings Space Pro: Which Should You Buy?
A spec-by-spec comparison of the Aranet Aranet4 Pro ($250) and the Airthings Space Pro ($300) — accuracy, sensors, connectivity, and which one fits your situation.
Quick Verdict
The Aranet Aranet4 Pro is $50 cheaper; the Aranet Aranet4 Pro has the tighter stated CO2 accuracy (±30 ppm); the Airthings Space Pro tracks more parameters (8 vs 4); only the Airthings Space Pro offers WiFi for remote monitoring; the Aranet Aranet4 Pro is the portable option.
Choose the Aranet Aranet4 Pro if you want to spend less, or measurement accuracy is your priority, or you will carry it between rooms or when travelling, or you want readings at a glance without an app.
Choose the Airthings Space Pro if you want the fuller picture (CO2, Temperature, Humidity, VOC, PM2.5, Atmospheric Pressure, Light, Noise), or you need remote access and history in an app.
Specs Side by Side
| Feature | Aranet Aranet4 Pro | Airthings Space Pro |
|---|---|---|
| Price | $250 | $300 |
| Sensors | CO2, Temperature, Humidity, Atmospheric Pressure | CO2, Temperature, Humidity, VOC, PM2.5, Atmospheric Pressure, Light, Noise |
| Sensor Type | NDIR | NDIR |
| CO2 Accuracy | ±30 ppm | ±50 ppm |
| CO2 Range | 0-9999 ppm | 400-5000 ppm |
| Connectivity | Bluetooth | WiFi |
| Display | Yes | No |
| Portable | Yes | No |
| Battery Life | 2+ years | USB powered |
Green highlights the stronger spec where there is a clear winner.
Frequently Asked Questions
Which is better, the Aranet Aranet4 Pro or the Airthings Space Pro?+
The Aranet Aranet4 Pro is $50 cheaper; the Aranet Aranet4 Pro has the tighter stated CO2 accuracy (±30 ppm); the Airthings Space Pro tracks more parameters (8 vs 4); only the Airthings Space Pro offers WiFi for remote monitoring; the Aranet Aranet4 Pro is the portable option. Choose the Aranet Aranet4 Pro if you want to spend less, or measurement accuracy is your priority, or you will carry it between rooms or when travelling, or you want readings at a glance without an app. Choose the Airthings Space Pro if you want the fuller picture (CO2, Temperature, Humidity, VOC, PM2.5, Atmospheric Pressure, Light, Noise), or you need remote access and history in an app.
Is the Aranet Aranet4 Pro or Airthings Space Pro cheaper?+
The Aranet Aranet4 Pro is the more affordable option at $250, versus $300 for the Airthings Space Pro.
Do both use real CO2 sensors?+
The Aranet Aranet4 Pro uses a NDIR sensor; the Airthings Space Pro uses a NDIR sensor. NDIR and photoacoustic sensors measure CO2 directly, unlike eCO2 estimators.
Which measures more air quality parameters?+
The Airthings Space Pro tracks more, with 8 parameters (CO2, Temperature, Humidity, VOC, PM2.5, Atmospheric Pressure, Light, Noise), compared with 4 for the Aranet Aranet4 Pro.
Neither One Quite Right? Consider These
Other monitors in the same class, ranked on sensor accuracy first.
Aranet Aranet4 Home
$200NDIR sensor · ±50 ppm · Built-in display
Research-grade ±50 ppm accuracy and runs 2+ years on a charge.
AirGradient ONE
$150NDIR sensor · ±50 ppm · Built-in display
Research-grade ±50 ppm accuracy and tracks 6 metrics in one unit.
Airthings View Plus
$300NDIR sensor · ±50 ppm · Built-in display
Research-grade ±50 ppm accuracy and tracks 7 metrics in one unit.
Browse the full monitor directory →
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