Levoit Core 400S review: an affordable, smart air purifier with HEPA filtration

The Levoit Core 400S is an affordable air purifier that packs a punch performance-wise, with an intuitive Smart interface that’s hard to beat.

Levoit Core 400S being tested in writer's home
(Image: © Future)

Top Ten Reviews Verdict

If you’re looking for an affordable air purifier with all the features and functionality of a top-end model, the Levoit Core 400S is the one for you.


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    Easy to operate

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    Powerful performance


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    The app can be unreliable

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Our deep dive into the Levoit Core 400S will give you the lowdown on everything this affordable air purifier has to offer, from setting up and operating the appliance to its ability to effectively purify your home’s air. We’ll also look at design, features, and functionality, such as its Smart technology and connected app, so you can be certain it’s the right air purifier for your household. And if it’s not, our best air purifier buying guide can direct you to the air purifier you need.  

Levoit Core 400S: Key Specs

Dimensions: H 20.5 in, D 10.8 in

Weight: 11 lbs

Filters: True HEPA 3-stage filter

Max noise: 52 dBs

Max power use: 38 watts

Coverage: 403 sqft

Modes: 4, plus sleep mode and auto mode

Warranty: 2-year limited

Energy Star Certified: Yes

The Levoit Core 400s features a True HEPA 3-stage filtration system to capture airborne particles in the home, including smoke, dust, pollen, and dander from pets. An activated carbon filter also absorbs volatile organic compounds (VOCs) that can cause nasty odors, including cooking, aerosol, and cleaning product fumes. 

What’s great about the Levoit Core 400S is the range of Smart features with this affordable air purifier. A connected app allows you to create a schedule for when you want your air purifier to power on and off, and you can look at what’s being absorbed hour by hour. You can also see historic air quality data and charts when your cleaner is working its hardest. 

The app allows you to connect to and control multiple cleaners around your home. It’s compatible with Alexa and Google Assistant, allowing you to power off and on or change the settings quickly and easily. 

Levoit Core 400S: Price & availability

  • $189.99 / £186.99
  • 2-year limited warranty  

The Levoit Core 400S is available directly from the Levoit website or selected retailers like Amazon, Home Depot, and Walmart. Offers occasionally crop up on other retailers’ sites, so users may want to shop around for the best deal. 

The price point of the Levoit Core 400S places it firmly in the mid-range of the market. But its extra features, Smart, connected technology, and powerful performance set this air purifier apart from other models at the same price. The Levoit Core 400S also consistently performed better in our at-home tests than more expensive devices, such as the Dyson Purifier Cool, which is more than double the price. 

Levoit Core 400S: Setup

It’s quick and easy to set up the Levoit Core 400S. First, unscrew the purifier’s base and remove the plastic packaging around the filter, then replace the filter and base and power it on. 

A QR code is included with the manual that allows users to install the VeSync app if they wish to control their air purifier from their phone, set a daily or weekly schedule, or get a deeper dive into their home’s air quality. It’s intuitive and easy to use, but it can be unreliable. We had to reinstall the app twice when it crashed during set-up.

The Levoit Core 400S features a vented ring at the top of the device, with a touch-sensitive control panel within. This is where users can turn the device on and off and adjust the settings. A series of color-coded indicator rings also tell you how clean your air is right now, from red (bad) to green (good). This is based on particles smaller than 2.5 microns, so you know how clean your air is by glancing at your purifier without logging on to the app. It also lets you know when your filter needs changing. 

You can set the Levoit Core 400S to auto mode, allowing it to work to the required setting depending on your air quality, or override it with your settings. There are four levels to choose from, including the barely audible sleep mode. 

The Levoit 400S covers 402 square feet, making it ideal for the average-sized home or small office. It’s affordable enough that users can buy two or more separate rooms in their homes. 

Levoit Core 400S being tested in writer's home

(Image credit: Future)

Levoit Core 400S: Design

Light enough (11 lbs) to pick up with one hand, the Levoit 400S is a sleek, white cylinder that’s thoughtfully designed. It features two handles on either side of the device for easy moving around the home. 

A futuristic-looking black vented ‘wheel’ sits at the top of the device. Within it, a display screen allows users to view air quality data, fan settings, filter status, auto mode, and sleep mode. You can also lock the display to show data all the time or set it to off. 

The casing is smooth and matte with no shine or gloss, giving this purifier a more expensively designed, sleek look and feel. 

Levoit Core 400S: Performance

  • Powerful performance 
  • Super quiet at lowest settings 
  • Higher absorption rate than more expensive models 

Levoit claims its Core 400S can purify your air in minutes. We tested this claim with a series of home-based trials, testing its performance on ambient air quality, a match smoke test, and an incense smoke test. We also compared how it performed at a setting lower than 50 decibels (level 3) to its highest setting of 52 decibels (level 4). 

It’s worth pointing out that even at its highest setting, the Levoit Core 400S doesn't rise above the volume level of normal conversation, while its quietest fan speed (level 1) is barely audible, at just 37 decibels. 

During our ambient air quality test at a setting lower than 50 decibels (level 3), we found that the Levoit 400S absorbed an impressive 99.5% of particles smaller than 0.3 microns and 100% smaller than 2.5 microns and smaller than 10 microns. We then re-ran the test on the highest setting of level 4 and got the same results. So, there didn’t appear to be much difference between the two highest settings regarding performance.

Our match test assessed how well the purifier absorbed harmful 0.3-micron particles. Again, even at a lower setting, the Levoit Core 400S performed much better than expected, absorbing 99.8% of particles smaller than 0.3 microns, 99.6% smaller than 2.5 microns, and 100% smaller than 10 microns. This was slightly improved at the higher setting, with an absorption rate of 99.9% on particles smaller than 0.3 microns, 99.9% on particles smaller than 2.5 microns, and 100% on particles smaller than 10 microns.

Our final test examined how well the purifier absorbed the particles released from incense cones. At level 3, it eliminated 99.9% of particles smaller than 2.5 microns and 100% smaller than 10 microns. At level 4, the highest setting, it absorbed almost 100% of particles smaller than 2.5 microns and 100% smaller than 10 microns. 

Using the same trials, we have tested several air purifiers at home and can confidently say that the Levoit Core 400S is one of the most powerful in its price bracket. It also outperformed much more expensive air purifiers, including the Dyson Purifier Cool.

Levoit Core 400S: User reviews

The Levoit Core 400S scores an impressive five stars out of 5 on Amazon, with 85% of reviewers giving it the full five stars. It also scores 4.9 stars out of 5 on Walmart’s site. 

People who purchased this air purifier say it is excellent at tracking and absorbing harmful particles. Many also say it helps to rid their homes of unpleasant smoke and pet odors. They also enjoy how quiet the purifier runs on its lowest settings and in sleep mode. 

Negative reviews, of which there are few, tend to mention the VeSync app’s unreliability, and some criticize the air purifier’s lack of stability (which is not something we noticed during testing). Others say the air purifier is too big and bulky for their homes. 

Should you buy the Levoit Core 400S?

If you’re looking for an affordable air purifier that meets and surpasses the performance of some top-end purifiers, the Levoit Core 400S could be the right fit for you.

Sleek, well-designed, and with a host of Smart features and functionality, the Levoit Core 400S has more going for it than most other similarly priced air purifiers. And it’s cheap enough to buy two or more for a large home or office space. 

However, if you want to only control your purifier via an app, you may be put off by the fact that some users find the companion VeSync app unreliable. 

How does the Levoit Core 400S compare?

If money’s no option and you want an air purifier with the wow factor, check out the Dyson Purifier Cool. Sleek and stylish, it’s certain to be a talking point in any home. 

If you like what Levoit offers but need a more compact air purifier, why not consider the Levoit H132? It’s smaller and lighter than the Core 400S and around two-thirds the price.

If you’re looking for an air purifier that can handle larger rooms, the Blue Pure 211+ could be the one. It's ideal for homes and office spaces with a floor area of up to 540 square feet. 

Joanne Lewsley
Customer Advisor, Vacuums, Cleaning and Air Quality

Joanne Lewsley is a UK-based freelance writer and editor, covering health and lifestyle news and features. She creates evidence-based health and parenting content and has worked with some of the world’s best-known brands and websites, including BabyCentre UK and Medical News Today. 

You can read more of Joanne's work and get in touch via her website: https://www.joannelewsley.co.uk/