Levoit Core 600S Vs Alen FLEX – Side-by-side Comparison!

The Alen FLEX and Levoit Core 600S are top-tier air purifiers designed to remove pollutants, allergens, and other harmful particles from your home’s air.

However, the Levoit focuses on delivering more advanced features alongside high-quality filtration performance. The Alen, on the other hand, stands out for its sleek design, premium build quality, and excellent filtration technology.

Both devices use three-stage filtration systems that ensure outstanding performance and cleaner air.

When it comes to features and smart options, the Levoit Core 600S clearly offers more. It includes an air quality sensor, color indicator, auto mode, smart app connectivity, and several additional features. The Alen FLEX, in contrast, lacks these advanced options.

Keep reading to find out whether the Levoit Core 600S’s smart features might be the deciding factor in choosing the better air purifier for your needs!

Specs: Levoit Core 600S Vs Alen FLEX

Performance Test – Comparison

As I mentioned earlier, the Alen FLEX and Levoit Core 600S are almost equally powerful. The FLEX uses a 50W motor, while the Core 600S uses a 49W motor.

However, the main difference lies in their room coverage. The Alen FLEX covers up to 300 sq. ft. (28 m²), while the Levoit Core 600S can purify twice as large a space, up to 635 sq. ft. (59 m²).

What’s interesting is that both models delivered nearly identical results in performance tests, even though they’re designed for rooms of different sizes.

In the first test, performed in a 560 sq. ft. (52 m²) room, the Alen FLEX improved air quality by about 94%, while the Levoit Core 600S achieved the same 94% improvement.

In the second test, this time in a room larger than recommended for both models (730 sq. ft. / 68 m²), they again performed exceptionally well. The Alen FLEX improved air quality by 89%, while the Levoit Core 600S improved it by 93%.

Both air purifiers ran for 60 minutes at their maximum speeds.

It’s clear that the Levoit achieved slightly better results in these tests, which is why I declared it the more efficient and better-performing device overall.

Smoke Box Test – Comparison

We tested both air purifiers in our smoke removal test, measuring how quickly each could remove smoke from a glass box.

I strongly believe that the higher CADR is the main reason the Levoit Core 600S performed much faster in this test. It needed only 9 seconds to remove all the smoke, while the Alen FLEX took 32 seconds.

However, the Alen FLEX features a superior pellet-based carbon filter that contains significantly more carbon than the Levoit’s, making it a better long-term option for neutralizing odors.

Noise Level Test – Comparison

To begin with, the Alen FLEX has three basic fan speeds plus an additional Turbo mode. Although it lacks a dedicated Sleep Mode, this air purifier is SleepScore certified.

This means that the sound it produces, known as “pink noise”, can actually help users sleep better without disturbing their rest. With noise levels ranging from 41.2 dBA to 53.7 dBA, it’s one of the quietest air purifiers I’ve ever tested.

The Levoit Core 600S, on the other hand, offers low, medium, and high fan speeds, along with separate Sleep and Turbo modes.

In Sleep Mode, the Levoit Core 600S produces 43.9 dBA, which is slightly louder than the Alen FLEX, but still quiet enough to use comfortably in a bedroom. As the fan speed increases, so does the noise level, reaching up to 68.5 dBA in Turbo Mode. However, this mode also delivers the highest airflow, so it’s a reasonable trade-off.

While the Levoit Core 600S is an excellent air purifier, I was impressed by the Alen FLEX’s quiet motor. It’s so silent that you’ll hardly notice it running in the same room.

Operating Costs – Comparison

When two air purifiers have almost identical motor power, it’s not always easy for users to make the right choice. In such cases, other factors come into play, such as price, which this time doesn’t favor the Alen FLEX.

Replacing the filters is also more affordable with the Levoit Core 600S. This is exactly why I like testing devices, to see whether they’re truly over or underrated.

If you were to use both air purifiers at their maximum speeds, 24h daily, for one month, your electric power bill would increase by about $2.13 in the case of the Alen FLEX and by about $4.22 in the case of the Levoit Core 600S.

Overall, the Levoit Core 600S feels like the better and more budget-friendly option.

It’s not just about the lower initial purchase price; over the long run, you’ll also spend less on replacement filters.

Features Overview

Straight at first, the obvious difference between Alen FLEX and Levoit Core 600S reflects in the number of features available. The said difference works in favor of the Core 600S, which has more to offer. Let me show you. Keep reading. 

Air quality sensor and Air Quality Indicator

Since Alen FLEX doesn’t have the air quality sensor or the air quality indicator installed, I have to point out the awesome AirSight Plus laser particle sensor Core 600S has. If you have read some of my previous comparisons, you are probably familiar with this feature. Its main job is to track the real-time air quality and send the information to other parts of the device.

For example, the sensor collects data on the current amount of PM2.5 particles in the air and communicates with the indicator placed on top of the air purifier. The indicator will light up in various colors, showing real-time pollution.

The great thing is these two features are running even when the device is in standby mode, and you can always monitor through the app. 

Auto Mode

Another feature available only within Levoit Core 600S is Auto Mode. There is a sort of joint action between the Auto mode and the Air quality sensor. Once you turn this mode ON, the air purifier will be set to the optimal operating level. This means that, depending on the data collected by the sensor, the air purifier will adjust its operating speed. That way you will never have to worry if you are protected enough. 

Since this feature is also available through the VeSync app, you get a little bit more from it. By more, I mean three specific operating modes such as the Quiet, the ECO, and the Efficient Auto Mode. I am sure you want more info on these options so go ahead and find it in the Core 600S standalone review, but do come back later. 

Filter Reset Indicator

Before you start thinking that there is no single feature in common, I am here to prove you wrong. Both FLEX and Core 600S have this option. The filter reset indicator turned out to be one of the essentials since it gives one of the most important information that affects the overall air purifier operating system. 

As you may know, that information keeps you updated on how far are you from replacing the air purifier’s filter. Whether you like to keep track by yourself or not, this feature will be nothing but of help. 

Sleep Mode

Having a Sleep mode feature, a little less a stand-alone one puts the air purifier in a competing position. In this case, only Levoit Core 600S has this speed level. Too bad for the Alen FLEX air purifier. You can turn it ON through the app too, and it instantly switches the air purifier to your bedroom’s best friend. It also turns OFF all the indicators within a few seconds. 

Timer

Having a Timer is always a plus for any air purifier and it comes almost as a pure must. Keeping your air purifier under control can save you time and money. Since Alen FLEX doesn’t have the Smart App available, you can only set the Timer manually. You get to choose between 2, 4 or 8 hours. 

As for the Levoit Core 600S, you can set the Timer either manually through the Control Panel or the VeSync app. The first option lets you set the time between 1-12 hours, but the latter one gives you additional 12 hours, meaning the time range is 1-24h. 

Display off and Display Lock

To show that Alan FLEX is not just a simplified air purifier, the producer gave it some extra features. 

For example, if you wish to use the FLEX in a bedroom during the night, you can easily turn off the indicators by pressing the power button once. Assuming the air purifier is turned ON previously. The next button press will turn OFF the device.

Display or Control Panel Lock serves to protect your air purifier mainly from curious children and pets, as well. A simple 5 seconds button press is enough to activate this option but also to deactivate it. 

Levoit Core 600S also has these two features, only named differently, but the purpose is the same. Only thing is, once you turn ON the Display off feature, the indicators will only be dimmed. 

Smart App

Being able to connect to a Smart app is still a privilege for most air purifiers, even though we’re living in an AI era. However, for the purpose of this comparison, it is important to signify why Levoit Core 600S had the advantage. The VeSync smart app gives so much more options if you wish to entirely use all that this air purifier has to offer. Most features are either unavailable directly on the Control Panel or can’t be entirely controlled. 

And, if you wish to use some of the available online assistants such as Alexa or Google Assistant, you can do it through the VeSync app. Don’t be afraid to use it, you will surely like it as much as I did. 

Control Panel

Positioned at the top of both appliances, Control Panel consists of the most relevant control buttons for each air purifier. I must note that Alen FLEX does have far fewer buttons than Levoit Core 600S. Besides the Power button, there are the filter replacement button, the timer, the speed level, and the lock button. I will be writing about each one of them in this comparison. 

The Core 600S has a kind of futuristic control panel, yet somehow I find it difficult to handle due to light reflections that can be quite annoying. In addition to all the buttons that FLEX has, the Core 600S has the Auto and the Sleep mode, air quality, and Wi-Fi indicator, plus the PM2.5 display.

Need I say that all these buttons are also available through the VeSync app? Yes, they are. 

Airflow

Another obvious fact is the difference in shapes between Alen FLEX and Levoit Core 600S. The first is flat and rectangular, while the other one is cylindrical. Hence the difference in the airflow. The FLEX air purifier has suction holes placed upfront, on both sides, and at the bottom. The air runs through the filters and gets dispersed into the room through the upperside holes. 

On the other hand, Core 600S has air inlets all over the bottom part of the appliance, after which the air gets filtered and released through the grills on top.  

Warranty

Sometimes, it is not the years of warranty that count, but the quality of the product itself and the producer’s reliability. Levoit company has a verified and proven quality, which is why I believe they might prolong the warranty life from the initial two years. 

On the other side, wish you become an Alen FLEX owner, you will be protected only for a year. However, if you subscribe to an annual filter replacement from this producer, you will be provided with a lifetime warranty. Hint, more data is available on the alen.com website. 

Filtration Technology

I am glad to notice that both FLEX and Core 600S share the best possible and optimal combination of filters. Hollow on the inside, Core 600S has a large filter situated at the bottom of the device. And, since this air purifier is CARB certified, it is 100% safe to use. 

The Alen FLEX air purifier has filters positioned frontally. Since filters are not physically attached one to another, you can easily change various available types of filters. There is a basic Dust, Mold, and Pet odors version available. But you can also upgrade it to additional Smoke or Heavy Smoke versions. 

If you wish for ultimate protection from excessive pollution, this is the combo you need. Let’s see why.

Pre-filter

First comes the first, a pre-filter. It is the number one filter that will stop all the larger allergens like dust, lint, fiber, pet hair, and pet dander from penetrating deep into the air purifier. That way a pre-filter also protects the True HEPA filter and allows it to shine. 

True HEPA filter

Being the crucial link in the filtration process it is essential to keep this filter protected from all the large particles that could harm it long term. It is capable of capturing 99.97% of airborne particles, such as dust, smoke particles, and allergens such as pollen and pet hair. 

Activated carbon filter

Coming up as a third in a row, an activated carbon filter is responsible for keeping all the unpleasant and everyday smells coming from your kitchen or pets. For this comparison, I used the second version of the Alen FLEX filter mentioned above, which contains 0.66 lbs of activated carbon and does a great job of neutralizing odors. 

Contrary, Levoit Core 600S has an exclusive ARC formula, that results in outstanding purifying results. The producer claims that this formula is effective with formaldehyde, benzene, ammonia, hydrogen sulfide, and volatile organic compounds (VOCs).

How to replace filters on both of these devices?

Before I get any deeper into the explanation, remember that both Alen FLEX and Levoit Core 600S have a Filter reset indicator, which will be an important assistant in maintaining your air purifier. 

If you pay close attention to the photos I posted here, you will notice the order of filters within Alex FLEX and the fact that it’s no big deal to replace any of the filters. It will take you from 9-12 months before this process is needed, but if you regularly clean and maintain it, the filter can last for a full year. 

Levoit Core 600S has quite a larger filter than some other air purifiers, so the producer usually recommends replacing it within 6-12 months in order not to affect the performance. Of course, keep it clean and do some vacuuming from time to time and your air purifier will be good to go.