Winner
Data from Amazon and official AirGradient and Apollo Automation sites.
2026 verdict
Taken as a whole in 2026, AirGradient ONE wins this matchup. Its strongest advantages show up in connectivity, screen, and sensors, with alerts helping widen the gap. Apollo MSR-2 with CO2 can still be the right pick, but only if price outweighs the wider strengths of AirGradient ONE. For the average buyer, AirGradient ONE is the safer choice.
| Feature | AirGradient ONE | Apollo MSR-2 with CO2 | Winner |
|---|---|---|---|
| Price | $195.00 | $56.09 | Apollo MSR-2 with CO2 |
| Connectivity | 2.4 GHz Wifi, Bluetooth | 2.4 GHz Wifi | AirGradient ONE |
| Screen | YES | NO | AirGradient ONE |
| Sensors | TVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, Humidity | CO2, Temperature, Atmospheric Pressure, Ambient Light, UV, Occupancy | AirGradient ONE |
| Alerts | Temperature Alerts, Humidity Alerts, Air Quality Alerts | Temperature Alerts, Air Quality Alerts | AirGradient ONE |
| Weather Resistance | NO | NO | Tie |
| Integrations | Home Assistant | Home Assistant | Tie |
Winner
$195.00
- + Connectivity: 2.4 GHz Wifi, Bluetooth
- + Screen: YES
- + Sensors: TVOC, PM0.3, PM1, PM2.5, PM10, CO2, NOx, Temperature, Humidity
- - Price: $195.00 vs $56.09
$56.09
- + Price: $56.09
- - Connectivity: 2.4 GHz Wifi vs 2.4 GHz Wifi, Bluetooth
- - Screen: NO vs YES
Frequently Asked Questions (FAQ)
- Which is better overall: AirGradient ONE or Apollo MSR-2 with CO2?
- AirGradient ONE has the stronger overall profile in this comparison, especially for connectivity, screen, and sensors.
- What is the biggest difference between AirGradient ONE and Apollo MSR-2 with CO2?
- Price is one of the clearest differences: AirGradient ONE lists $195.00, while Apollo MSR-2 with CO2 lists $56.09.
- Which one looks better on price?
- AirGradient ONE is listed at $195.00, while Apollo MSR-2 with CO2 is listed at $56.09. Apollo MSR-2 with CO2 (better spec).
- Who should buy AirGradient ONE?
- Choose AirGradient ONE if your priority is connectivity and screen and that matters more than price.
- Who should buy Apollo MSR-2 with CO2?
- Choose Apollo MSR-2 with CO2 if your priority is price and that matters more than connectivity.
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