ThailandAirGradient builds open-source indoor and outdoor air quality monitors that track PM2.5, CO2, temperature, humidity and other pollutants. The company is known for its open hardware and firmware, letting users build, repair and integrate the monitors with platforms like Home Assistant and its own dashboard. AirGradient appeals to people who want transparent, data-driven air quality monitoring rather than a closed black box.
View AirGradient
ChinaThird Reality, often styled THIRDREALITY, makes affordable Zigbee and Matter smart home accessories such as smart switches, plugs, motion and contact sensors, and night lights. Its devices are popular with SmartThings, Hubitat and Home Assistant users looking for low-cost Zigbee gear. Third Reality focuses on simple, budget-friendly automation building blocks.
View Third RealityEvery product, compared
Switch between each brand's full lineup, tap any product for specs, compatibility and pricing.
Air Quality MonitorsThird RealitySmart Air Quality Sensor
$49.99
DonglesThird RealityUSBC-Dongle
3.1(72)$19.99
Garage Door OpenersThird RealitySmart Garage Door Opener
4.2(85)$49.99
LED BulbsThird RealitySmart Color Bulb ZL2
$15.99
Presence SensorsThird RealitySmart Presence Sensor R2
3.2(12)25% OFF$39.99$29.99
Presence SensorsThird RealitySmart Presence Sensor R3
3.5(59)20% OFF$49.99$39.99
Vibration SensorsThird RealityVibration Sensor
4.1(602)$19.99
Wall OutletsThird RealitySmart Wall Outlet ZW1
3.5(13)$29.99
Water Leak SensorsThird RealitySmart Water Leak Sensor WL2
3.9(41)22% OFF$17.99$13.99
Water Leak SensorsThird RealityWater Leak Sensor
4.1(351)$20.99
Window CoveringsThird RealitySmart Blind
4.0(108)$158.99