The Levoit Core 400S is a mid-range air purifier with a three-stage filtration system. It's larger than the Levoit Core 300S and uses a more powerful motor. It boasts a similar range of automation features, with a built-in air quality sensor, smartphone app integration, and compatibility with Amazon Alexa and Google Assistant devices, allowing you to change settings with voice commands.
Our Verdict
The Levoit 400S air purifier is an excellent fit for pet owners. It's effective in trapping finer particles like pet dander, and you can use its companion app to have it run while you're away from home. That being said, it's a little louder than some alternatives, with a somewhat higher-pitched tone than other Levoit Core models, which is far from ideal if your pet is sensitive to louder noises.
- Wide assortment of convenience features.
- Excellent overall filtration performance.
- Companion app integration.
- Noisy at higher fan speeds.
- Somewhat large footprint.
The Levoit 400S is very good for bedrooms. It features a 'Display Off' function, so there are no bright lights you need to cover. While it's a little loud at higher fan speeds, with a slightly higher-pitched tone than alternatives, it's thankfully much quieter at lower speeds. It also offers amazing overall filtration performance. It's fairly large, and you can't rest it on a shelf or dresser.
- Wide assortment of convenience features.
- Excellent overall filtration performance.
- Display light shutoff.
- Companion app integration.
- Noisy at higher fan speeds.
- Somewhat large footprint.
- Wide assortment of convenience features.
- Excellent overall filtration performance.
- Companion app integration.
- Noisy at higher fan speeds.
- Somewhat large footprint.
- Wide assortment of convenience features.
- Excellent overall filtration performance.
- Companion app integration.
- Noisy at higher fan speeds.
- Somewhat large footprint.
Performance Usages
Changelog
- Updated Nov 04, 2025: Version 1.0.2 of our Air Purifier Test Bench rectifies calculation errors in our existing Particle Filtration Rate test to provide more representative results of some units. For a more detailed breakdown of the changes made, see our full changelog.
- Updated Oct 31, 2024: Converted to Test Bench 1.0.1.
- Updated Jun 25, 2024: Following user feedback, we've updated the text in the 'Filter Configuration' section of the review to remove any mention of HEPA filtration, as the manufacturer no longer advertises this unit's main filter as being HEPA-rated.
- Updated May 13, 2024: Review published.
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Differences Between Sizes And Variants
This air purifier is available in three color variants: 'Black,' 'Gray,' and 'White.' We tested the 'Black' model.
Let us know in the comments if you come across another variant.
Popular Air Purifier Comparisons
This is a mid-range air purifier with a three-stage filtration system. The Core 400S is a better option than the cheaper Levoit Core 300S in most ways; while it has a much bigger overall footprint, it's far more effective in larger areas and boasts a similar range of convenience features. Its somewhat high-pitched operating noise can be annoying, especially when running the device at higher fan speeds.
The Levoit Core 400S and Levoit Vital 200S are somewhat evenly matched machines, though we'd give the edge to the Vital 200S for most uses. Both machines deliver near-identical air purification performance and have similar smart features, but only the Vital 200S has a washable pre-filter and a U-shaped air inlet that's intended to resist clogs from pet hair.
Test Results
The ring of lights around the power button changes color based on current air quality:
- Blue: Very good
- Green: Good
- Yellow: Moderate
- Red: Bad
Tapping the 'Display Off' button turns off all of the device's indicator lights and the night light. On that subject, the night light features two levels of brightness.
The VeSync companion app also allows you to remotely adjust the fan speed, set operating schedules, and send filter replacement reminders. It also can be used to view a real-time estimate of air quality.
This air purifier has a three-stage filter system comprised of a pre-filter for trapping larger airborne particles, a primary filter for trapping dust and mold particles, and an Activated Carbon filter for minimizing odors. You'll only need to clean the pre-filter with a soft-bristle dusting brush or a vacuum every two to four weeks, but make sure not to damage any other parts of the filter system when doing so.
You'll need to replace this filter assembly every six to eight months, and you can find a replacement here.