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Levoit 400S Review: Is It Good Air Purifier?

If you are looking for a smart air purifier, I suggest you check out the Levoit 400S review. This device can cover up to 400 sq ft with a plasma function and has a Vesync App to use its different features with one tap.

Sounds impressive, right? But is it worth buying? Let’s dive into the details and find out.

Quick Answer

The Levoit Core 400S is a great choice for anyone who wants a high-performance air purifier with smart capabilities and a stylish design. It can effectively clean the air in large rooms and offer convenience and customization through its app and voice control.

Its features are:

  • PM 2.5 Display detected by the laser control.
  • Three-stage filter system with true HEPA filter.
  • Air quality sensor and auto mode.                                                                                 

However, there are some things you should know before you decide to buy this air purifier.

Continue reading as I will cover all details about the Levoit Core 400S air purifier like its performance, maintenance, and customer service. I will also cover the expensive costs of filter replacement, accessibility issues, and other downfalls.


Listed below is the evaluation of different specs:




Power Supply:

AC 120V, 60Hz

Rated Power:


Effective Range:

403 ft² / 37 m²


260 CFM / 442 m³/h

Noise Level:



10.8 x 10.8 x 20.5 in / 27.4 x 27.4 x 52 cm


14.12 lb / 6.4 kg

Filter Type:

H13 True HEPA filter with ARC Formula™

Filter Life:

6-8 months

Smart Features:

AirSight™ Plus Technology, VeSync App Control, Voice Control, Auto Mode, Sleep Mode, Timer, Screen Off, Lock Screen

Standby Power:

< 2W

Operating Conditions:

Temperature: 14°–104°F / -10°–40°C

Humidity: < 85% RH


1 year, 2 years with registrations


Levoit Core 400S Upsides and Downsides

Levoit Core 400S Smart Air Purifier
18,518 Reviews
Levoit Core 400S Smart Air Purifier

Here are some of the pros and cons of this purifier


  • An Integrated PM2.5/ timer display.
  • Great CADR and performance with 3-stage filtration technology for optimal air.
  • You can set it up without any hassle.
  • Easy to use and change an air filter.
  • Low power use and simple design.
  • Easy on the purse (affordable air purifier)


  • Original filters are pricey and hard to find.
  • It’s a little oversized for small rooms.
  • Sometimes the app doesn’t work properly.

An Insight Into the Room Coverage & CADR

The Levoit Core 400S is rated for rooms up to 400 square feet in size and has a CADR (clean air delivery rate) of 260 cubic feet per minute. This means it can clean the air in a 400-square-foot room four times per hour on the highest setting.

According to independent testing, the device improved the PM2.5 by 97.3% and reduced the air particulates from 839 to 44 in a 12 x 10-foot room.

Three-Stage Filtration System Explained

Below are all the details on filtration you should know:

Levoit 400S review: Filters

1. Pre-filter

This is a washable filter that traps large particles such as

  • Hair,
  • Fur,
  • Lint, and
  • Dust.

It also helps extend the life of the other filters by reducing their workload.

2. True HEPA Filters

This is the main filter that captures 99.98% of airborne particles as small as 0.3 microns, such as

  • Pollen,
  • Mold spores,
  • Pet dander,
  • Dust mites,
  • Bacteria,
  • Viruses, and
  • Smoke.

It also helps reduce allergens and improve indoor air quality.

3. Activated Carbon Filter

This is a filter that absorbs gases, VOCs (volatile organic compounds), and other chemicals from the air. It also helps freshen up the air and eliminate unpleasant smells.

How Loud is the 400S When it is Running?

Well, according to the manufacturer, this air purifier has a noise range of 24-52 dB, depending on the fan speed.

  • It has five fan speeds, including a sleep mode that is extremely quiet and emits a sound of only 24 dB.
  • To put that into perspective, 20 dB is equivalent to whispering, which is barely audible.
  • Even at the highest speed, the Levoit Core 400S is not too noisy, as it produces a sound of only 52 dB. That is comparable to the noise level of a quiet conversation or a humming refrigerator.

Here is a table that shows the noise levels of the Levoit Core 400S at different fan speeds:


Value (dB)

Sleep Mode

24 dB

Low Mode

28 dB

Medium Mode

35 dB

High Mode

46 dB

Turbo Mode

52 dB

As you can see, the 400S is one of the quietest air purifiers on the market, especially at lower speeds. It is ideal for bedrooms, living rooms, offices, or any other place where you want to enjoy clean and fresh air without being disturbed by loud noises.

Now let’s head towards the other features.

Exploring the Controls and Display

The Levoit 400s has a sleek and intuitive touchscreen control panel on the top of the device. You can easily adjust the settings and monitor air quality with a simple tap.

levoit 400s display

The display shows the following:



On/Off Button

Turns on/off the air purifier

Fan Speed Button

Adjusts the fan speed from low to turbo

Wi-Fi® Indicator

Shows the pairing status with Wi-Fi

Sleep Mode Button

Activates or deactivates Sleep Mode

Air Quality Indicator Rings

Shows the air quality level with different colors

Timer Button

Set a timer for the air purifier to run for up to 12 hours

Display Lock Button

Locks or unlocks the current settings

Auto Mode Button

 Activates or deactivate Auto Mode

Check Filter Indicator Reset Button

Resets the Check Filter Indicator

Display Off Button

Turns off the display

1. Timer

Here are all the details you should know about setting the timer of the device:

  • You can set a timer for the Levoit 400s air purifier to run for a specific duration, from 1 to 12 hours.
  • You can monitor the timer setting via the Levoit app.
  • It is useful if you want to save energy or schedule the air purifier to turn off automatically when you are away or asleep.
  • It is also shut down by itself once it reaches the time set to clean air.

2. Screen Off

You also have the option to turn off the display screen of the Levoit 400S air purifier. This will also disable the Wi-Fi function and the voice control feature.

  • To turn off the screen, press and hold the moon icon on the control panel for 3 seconds.
  • To turn it back on, press and hold the moon icon again for 3 seconds.

3. Lock Screen

The lock screen function of the medium-sized air purifier prevents accidental changes to the settings or unwanted access by children or pets. When it is activated, the touch screen will not respond to any commands.

To activate the lock screen,

  • Press and hold the lock icon on the control panel for 3 seconds.
  • A lock symbol will appear on the display to indicate that the lock screen is on.
  • To deactivate the lock screen, press and hold the lock icon again for 3 seconds.

Check out this video for a better understanding of the controls.

A Glimpse of Important Features

The Levoit 400S is a smart device that can help you breathe easier and healthier in your home. It also has a built-in humidifier that adds moisture to the air and prevents dryness. You can control it with your voice, the purifier’s app, or the touch panel on the device.

Let’s see what it has got under the hood:

levoit 400s A Glimpse of Important Features

1. Sensor and Indicators To Monitor Air Quality:

It has a PM2.5 laser dust sensor that monitors air quality in real-time and displays it on the LED ring on the device.

The LED ring changes color according to the air quality level:

  • Blue for good,
  • Green for moderate,
  • Yellow for unhealthy,
  • Red for very unhealthy, and
  • Purple for hazardous.
levoit 400s air quality

You can also check the PM2.5 value and the humidity level on the app or the touch panel.

2. Auto Mode

Following are the details about this mode:

  • It has an auto mode that automatically adjusts the fan speed and the humidifier level.
  • This way, you don’t have to worry about manually setting the device and enjoy optimal performance and energy efficiency.
  • You can also set a timer or a schedule on the app or the touch panel to turn on or off the device at your preferred time.

I have explained how to use this function in the above-mentioned timer section.

3. Sleep Mode

Here’s what you need to know:

  • The 400S has a sleep mode that turns off the LED ring and reduces the fan speed to the lowest level.
  • This creates a quiet and dark environment for you to sleep better at night.
  • It also disables the voice control and the app control, so you won’t be disturbed by any notifications or commands.
  • You can activate or deactivate the sleep mode by pressing the moon button on the touch panel.

4. Filter Reset Indicator

It contains a filter reset indicator that reminds you when is time to opt for a new filter.

levoit 400s filter reset indicator

  • The filter should be replaced every 6 to 8 months depending on the usage and the air quality.
  • You will observe a red flash when it’s time to change the filter.
  • You can reset the indicator by pressing and holding it for 3 seconds after replacing the filter.

VeSync Smart App

One of the features that set the Levoit Core 400S apart from other air purifiers is its compatibility with the VeSync smart app. This app allows you to control the device remotely from your smartphone or tablet, as well as integrate it with Alexa or Google Assistant voice commands.

You can also monitor the

  • Air quality level,
  • Filter status, and
  • Usage history on the app.

One of the best features of the 400S is its Wi-Fi connectivity which allows you to control it remotely via the VeSync app on your smartphone.

levoit 400s VeSync Smart App

The app lets you:

  • Turn the device on or off.
  • Adjust the fan speed.
  • Set a timer or schedule.
  • Monitor the air quality level and filter life.
  • Receive notifications and alerts.
  • Control it with voice commands using Alexa or Google Assistant.

Levoit has been launching more state-of-the-art air purifiers that are compatible with the VeSync app. This means that the app is constantly being updated and refined to offer users as many advantages as possible when using the app.

VeSync – Adding a device

The first thing to get started is that you need to download the app from the Android or iOS store. Once downloaded, open the app and register with your authentic email address. Once done, proceed to the next step, which is adding your device to the app.

Follow these steps for a successful connection:

  • Tap on the “+” icon on the top right corner of the app’s home screen and select “Air Purifier”.
  • Follow the instructions on the app to scan the QR code on the back of the Core 400S or enter its serial number manually.
  • Wait for a few seconds until the app confirms that the device is connected.

There is no rocket science involved and the process is pretty much simple. For more details check out this video.

What I Don’t Like About the App:

While exploring the app, I discovered the following things which I don’t like:

  • A community section where users can post statuses or chat with each other. My take is that such an app should be functional and simple, and work smoothly.
  • Many ads pop up and they are too intrusive and simply annoying when using the app daily.

Overall, my experience with the app was nice. It helps in controlling the 400S with simple taps. It would be even better if the interface is simple and it becomes ad-free.

How to View and Control the Air Quality with the VeSync App

Once you have successfully connected the purifier to the app, you can view and control various aspects of the device and the air quality in your home. On the app’s home screen, you will see a card that shows the name of your device, its

levoit 400s vesync air quality

  • Current status (on or off),
  • Fan speed (low, medium, high, or auto),
  • Filter life (in percentage), and
  • The current PM2.5 level (in micrograms per cubic meter).

You can tap on this card to enter the device’s control panel, where you will find more options and information.

For more insights, you can explore the air quality sensor section that I mentioned above.

What is PM2.5 and Why Should You Care?

PM2.5 stands for particulate matter with an aerodynamic diameter of fewer than 2.5 micrometers. These are very small particles that can be found in the air, and they can come from various sources, such as

  • Combustion,
  • Mechanical processes, or
  • Chemical reactions.

PM2.5 can pose serious health risks, as it can penetrate deep into your lungs and even enter your bloodstream. It can also reduce visibility and cause haze. Therefore, it is important to monitor and control the PM2.5 levels in your indoor environment.

A Look at the Design of this Air Purifier

The Levoit Core 400S has a sleek and futuristic design that blends well with any decor.

  • It features a white cylindrical shape along with a black output vent.
  • The control panel is also black with blue and white accents, and it’s touch-sensitive and easy to use.
  • The device is compact and lightweight, measuring 12.6 x 12.6 x 20.5 inches and weighing 13.2 pounds.
  • It also has a handle at the back for easy transport.
levoit 400s design

Airflow of 400S Air Purifiers Explained

Here is what you need to know about the air circulation of the product:

  • The Levoit 400S air purifier circulates and purifies air more effectively with VortexAir™ Technology. It has a round base with intake holes and a top vent with an output hole.
  • The air purifier sucks in air from all directions around the base and filters it through three layers: a washable pre-filter, an activated carbon filter, and a True HEPA filter.
  • The filtered air is then blown out from the top vent in a spiral shape that distributes clean air into the room.
  • The air purifier has five fan speeds, from a silent “sleep” speed to a noisy “turbo” speed. It also has a timer function that lets you set the air purifier to run for up to 12 hours and an Auto Mode that changes the fan speed based on the air quality.
  • The air purifier has a CADR (Clean Air Delivery Rate) of 260 CFM / 442 m3/h, which means it can filter 260 cubic feet or 442 cubic meters of air every minute. It is suitable for rooms of up to 403 ft² / 37 m² in size.

For a detailed review, I recommend you check out this video.

Setting Up the 400S: Sharing From the Experience

In this part, I will share my experience with setting up and using the Levoit Core 400S.

How Did It Go?

Setting up the 400S was very easy. I just had to remove the plastic wrap from the filter, plug in the device, and turn it on. The touchscreen display on the top of the device showed me the current air quality level, which was green (good) in my case. For more insights on colors and quality, check out the above indicator section.

How to Actually Setup?

To connect the device to Wi-Fi:

  • I had to download the VeSync app on my phone and follow the instructions.
  • The app scanned a QR code on the device and asked me to enter my Wi-Fi password.
  • It took less than a minute to complete the connection.
  • The app then showed me the device status, air quality level, filter life, and other settings.
Setting Up the 400S

My Overall Experience

One of the benefits of having a Wi-Fi connection is that I can control the device remotely from anywhere. I can also use voice commands with Alexa or Google Assistant to turn it on or off, change the fan speed, or check the air quality. The app also lets me set schedules, timers, and reminders for the device.

Operating Costs

Here is the rundown of how much it will cost you to use this product:

  • The filters need to be replaced every 6 to 8 months, depending on the usage and air quality.
  • The replacement filter costs $50, which is a bit pricey, but worth it for the air cleaning performance test.
  • The device also has an energy-saving mode that adjusts the fan speed according to the air quality level, which can help reduce electricity costs.

Levoit Support and Warranty

Here is what you need to know about the return policy of the Levoit.

  • The Levoit Core 400S comes with a one-year warranty.
  • It can be extended to two years if you register the product online.
  • The customer service is responsive and helpful.
  • They offer free shipping and returns within the US.

Verdict: Is it Worth the Money?

After going through specs, features, and pricing, my say is that the 400S is a solid investment. Not only it has a great design but also possesses all the must-have features. Just keep in mind that the app can be unreliable sometimes. But, it is still worth it making it an ideal air purifier.

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Frequently Asked Questions

How long does the Levoit 400S filter last?

The Levoit 400S filter lasts for about 6 to 8 months, depending on the air quality and usage frequency. You can check the filter status on the display or the app, and replace the filter when it turns red.

What is the coverage of the Levoit Core 400s?

The Levoit Core 400s can cover up to 400 square feet of space, making it suitable for medium to large rooms, such as living rooms, bedrooms, offices, or studios. It can also circulate the air up to five times per hour, ensuring fresh and clean air throughout the room.

Is Levoit a reliable brand?

Levoit is a reliable brand that specializes in the best air purifiers and humidifiers. It has been in the market since 2017 and has gained popularity for its stylish, efficient, and affordable products. Levoit also offers a one-year warranty and lifetime customer support for its products.

Does Levoit Core 400s produce ozone?

No, Levoit Core 400s do not produce ozone or any harmful byproducts. It uses a mechanical filtration system that consists of a pre-filter, a true HEPA filter, and an activated carbon filter. It does not use any ionizers or UV lights that may generate ozone or other pollutants.


The Levoit Core 400S is a smart and powerful air purifier that can improve your indoor air quality and health. It is also energy-efficient with a PM 2.5 laser dust sensor and is easy to maintain the device.

If you are looking for a mid-sized compact air purifier that offers great performance, easy operation, and smart connectivity, you may want to consider this purifier.

Levoit Core 400S Smart Air Purifier
18,518 Reviews
Levoit Core 400S Smart Air Purifier

This air purifier is small and economical. It can purify the air with 99.97% effectiveness in rooms up to 400 sq ft. It has a smart sensor with voice control and silent operation. It also has a sleep mode and off display option for a restful sleep.