Tom's Guide90est.
The Levoit Core 400S is an effective, quiet, and stylish air purifier that impresses with its smart features, responsive auto mode, and intuitive app control.
Levoit Core 400S
6 expert reviews#2 in air purifiersChecked 1 Nov 2026
Quick answer
The Levoit Core 400S has a critic score of 84 out of 100 from 6 professional reviews, and 5 of them recommend it. It ranks #2 of 2 air purifiers we score. Critics praise its air cleaning and app and smart features. The most common complaint is filter cost.
Reviews checked 1 Nov 2026
Image: LevoitIf you want an app
Our verdict
The Levoit 400S matches the Coway on air cleaning and adds a good app with live air-quality readings, plus a quiet sleep mode. Critics' main complaints are the price of replacement filters and an app that shows ads.
The catch: Pricey filters, and ads in the app.
Critic agreement: High
Scores run from 73 to 90
5 of these 6 outlets print no score. We estimated theirs from the review text and corrected for the known tendency of estimates to run high.
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What do critics say about the Levoit Core 400S?
Good Housekeeping85est.
The Levoit Core 400S is an innovative and effective air purifier that stands out for its strong particulate cleaning, quiet operation, and convenient smart app controls.
The Independent85est.
The Levoit Core 400S offers impressive filtration performance, a helpful app, and smart features at a competitive price point, though its design is somewhat utilitarian.
Architectural Digest85est.
The Levoit Core 400S is a high-tech air purifier praised for effectively reducing dust and improving sleep quality, though buyers should note the brand dropped its True HEPA designation.
Bob Vila85est.
The Levoit Core 400S is an effective and user-friendly air purifier that quickly clears pet dander, hair, and odors while operating quietly on auto mode.
TechGearLab73
The Levoit Core 400S-P is a powerful, ozone-free air cleaner that excels at removing particles, odors, and VOCs while offering great smart features.
Scores are converted to 0–100. "est." means the outlet gave no number, so we estimated one from its verdict. How we score
What critics praise most
Air cleaning5 of 6
App and smart features5 of 6
Quiet4 of 6
What critics dislike most
Filter cost3 of 6
Price3 of 6
Noise on high2 of 6
Alternatives
Not sure about the Levoit Core 400S?
Common questions
Is the Levoit Core 400S worth it?
Most critics think so: 5 of 6 recommend it. Pricey filters, and ads in the app.
What do critics dislike about the Levoit Core 400S?
Filter cost (3 of 6 reviews), Price (3 of 6 reviews), Noise on high (2 of 6 reviews).
What is the best alternative to the Levoit Core 400S?
The Coway Airmega AP-1512HH Mighty (critic score 84), best overall.