Product catalogue

Independent reviews of 28 smart home products, with links to the Amazon store for your region.

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clean-air
Airthings
8.2 /10

Airthings View Plus Air Quality Monitor

Buy this if radon is a real concern where you live, or you are moving into a home and want to know before you commit. For that job it has almost no rival at this level. If you do not care about radon, a cheaper multi-sensor monitor covers the rest of what it does for a lot less. Two honest catches. The price is high for something that only measures and never cleans the air. And the headline sensor, radon, needs two to three weeks of data before the number is trustworthy, so patience is part of the purchase. Taken for what it is, a careful long-term watch on your indoor air, it is excellent.

Measures
Radon, CO2, PM2.5, VOCs, humidity, temperature, air pressure
Display
2.9-inch e-ink showing four chosen values, with a motion-activated colour indicator (green, amber, red)
Connectivity
2.4 GHz Wi-Fi and Bluetooth Low Energy, using Airthings' own link to the app and hub
Power
Six AA batteries, quoted up to two years, or a USB-C cable for continuous power
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clean-air
LEVOIT
7.9 /10

LEVOIT Core 400S Smart Air Purifier

Buy this if you want to clean the air in a large room and you value smart control and strong particle removal. It is a lot of purifier for the money. The hidden cost is the filter. Plan on replacing it every 6 to 12 months, sooner if you have pets or a smoker in the house, and each one is a genuine Levoit part you keep buying for the life of the unit. The bonded filter is the honest trade-off for the compact cylindrical shape, and it means the odd unnecessary carbon swap. If you mostly run it flat out, the noise at maximum speed will bother you, so size the purifier to the room instead of pushing a small unit hard.

Coverage
Levoit rates it up to 1,980 sq ft once per hour. For the 4 to 5 air changes an hour that actually keep a room clean, plan on a few hundred square feet
CADR
231 CFM smoke, AHAM-verified
Filtration
Three stages in one bonded filter: fine pre-filter, HEPA-grade particle layer, activated carbon for odours
Noise
About 24 dB on the lowest setting, rising to roughly 52 dB at full speed
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clean-air
LEVOIT
7.6 /10

LEVOIT Core 300S Smart Air Purifier

Buy this for a bedroom, a nursery or a small office, where its quiet running and genuine auto mode matter most. Ask it to clean a living room and it will run flat out and still struggle, so match it to the room. The hidden cost is the filter, the same as on every Levoit. Plan on a replacement every 6 to 8 months or so, sooner with pets or smoke, and each one is a genuine Levoit part. Because the carbon and HEPA are a single bonded unit, you sometimes bin a HEPA layer that still had life in it. Within a small room and with that running cost understood, it is very easy to live with.

Coverage
Levoit rates it at 1,051 sq ft once per hour, or about 219 sq ft at the more meaningful 4.8 air changes an hour
CADR
141 CFM smoke (240 m³/h)
Filtration
Three stages in one bonded filter: pre-filter, HEPA-grade particle layer, activated carbon for odours
Noise
22 dB on the lowest setting, rising to about 50 dB at full speed, with QuietKEAP damping
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clean-air
Amazon
6.8 /10

Amazon Smart Air Quality Monitor

Buy this if you already live in an Alexa home and just want a sense of whether your air is clean, without spending much. The missing screen is the defining trade-off. You cannot glance at a wall display, so the numbers stay hidden until you open the app or ask an Echo. It works best as a trigger, kicking off a routine that switches on a purifier when PM2.5 climbs, and less well as an instrument you read off directly. Do not lean on its carbon monoxide reading for safety, because it is not a certified CO alarm. If you want CO2 or a display you can see across the room, spend more and look elsewhere.

Measures
PM2.5, volatile organic compounds (VOC), carbon monoxide (CO), humidity, temperature
Display
None. A single multicolour light shows a rough status. Actual readings come from the Alexa app or an Echo
Connectivity
2.4 GHz Wi-Fi, with Bluetooth used for setup
Ecosystem
Alexa only. Needs an Amazon account and the Alexa app, and an Echo to read values by voice
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