Rank 6 of 6 in Air purifiers Sources disagree

Levoit Core 400S

4 tests from 3 countries · 3 of them not from the UK

Score by criterion

Air cleaning 68

Ease of use 78

Running costs 57

Retailers

Particle filtration rate 8.0 out of 10 (RTINGS)
Quiet and frugal: 25 dB(A) in night mode, 43 dB(A) at full power, using 23 W (Trusted Reviews)
Environmental properties and safety very good (Stiftung Warentest 1/2022)

Air cleaning only “sufficient” (4.0) at Stiftung Warentest, plus clear flaws in the app’s data transmission (issue 1/2022)
The European version cleans more slowly than the US version: 30 instead of 24 minutes in the test room (HouseFresh)
Replacement filters are expensive and last about six to eight months (Trusted Reviews)
Loud at high speeds, with a rather high-pitched tone (RTINGS)

Source	Country	Issue	Original verdict	Converted
Stiftung Warentest	Germany	test 1/2022 · as reported by testberichte.de	befriedigend (3,5)	60
Trusted Reviews	United Kingdom	01/2024	4/5	80
HouseFresh	USA	Core 400S [U.S.]	67 %	67
RTINGS	USA	05/2024	Bedroom 7.6 · Pets 7.9 · Particle Filtration Rate 8.0 · Footprint 7.1	–

Each dot is the average test result of one country, converted to 0–100. The further apart the dots, the more it pays to read the individual reports.

Levoit Core 400S ± 10 pts