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Pros & Cons
Pros
The coway pro is very very quiet and has yet to increase the fan in auto mode it works so well. I like the double sided filter feature and the noise level that this machine produces. Air quality automatically adjusts fan speed based on air quality.
The airmega 400 purifier runs odor-free. It has a true hepa filter. The main screen filter is washable.
This prox unit is so efficient that in turbo mode the air has been cleaned in about five minutes. Easy to disassemble for cleaning.
Air filters for each vent. Works for 4,000 sq ft house. Great room/kitchen/livingroom is one large continuous space.
Cons
Account registration and login integration is completely jacked. App is terribly slow and unreliable, and google assistant integration is far worse. The app is a travesty.
Each unit is about six feet from the wi-fi router. It's not like it had poor reception or anything, it's like it would just erase the wifi link randomly. Not sure paying for the wifi/connected version of this os worth it.
My house is smelly dusty and dirty. Other than the abysmal application, the device works fine if you're ok with $50 every year for charcoal carbon filters. And it's profoundly disturbing that a company who predicates the value of their product on the ... Read More
The app is utterly worthless. I have a houseful of ‘smart’ devices, and nothing else gives me this level of grief. The purifier itself is good quality but the'smart' aspect of it is nothing but a * migraine all the time.
The fan on 2 is still obnoxious, but on 1 is virtually silent. Anything over level 1 is noticeable, and you’ll have to speak louder or turn the tv up. It's unfortunate since i have been loyal to coway - having purchased a total of 5 units (mostly dire... Read More

Highlights
Quality
Good quality, responds automatically to changes in air quality (like when someone’s cooking) and is quiet in everyday low mode.
Obviously a top quality product, glad to have purchased it
It is very sensitive to changes in the air and kicks on quickly when i am cooking in the kitchen something that becomes airborn... Read More
Low setting is so quiet that i can't hear it, middle setting is pretty quiet and high setting is a little loud but it moves a lot of air.
Price
I got it on sale when it was about $400 to the door, and i loved it so much that i bought one for my parents!
This is the real deal, true hepa with carbon.
Years ago, i had a sub $100 unit and it was pretty useless.
It is one of those self care things you would never really buy for yourself due to the cost, but once you have it you will never go back.
Shipping
First shipment was damaged, so it was returned.
Competitiveness
I liked it so much that i replaced the levoit 300 in my bedroom with an airmega 100, and i like it very much too.
The filter media is much better made than the levoit units, having much more activated carbon, and much more surface area.
Overall, the coway airmega 400s is a powerful and smart air purifier ideal for large living rooms, though it comes with a higher price tag.
Overview
- How are reviewers describing this item?
quality, quiet, good and great. - Our engine has profiled the reviewer patterns and has determined that there is minimal deception involved.
- Our engine has detected that Amazon has altered, modified or removed reviews from this listing. We approximate total reviews altered up to 1875.
- Our engine has discovered that over 90% high quality reviews are present.
- This product had a total of 6,304 reviews as of our last analysis date on Feb 18 2025.
Helpful InsightsBETA
Posted by a reviewer on Amazon
I always thought air purifiers were scams
Posted by a reviewer on Amazon
Years ago i had a sub 100 unit and it was pretty useless
Posted by a reviewer on Amazon
But i saw this pop up on a deals site and everyone was raving about it so i took a chance
Posted by a reviewer on Amazon
I figured if it was junk science i would send it back after a week
Posted by a reviewer on Amazon
I couldnt believe my nose
Posted by a reviewer on Amazon
It is one of those self care things you would never really buy for yourself due to the cost but once you have it you will never go back
Posted by a reviewer on Amazon
No more hacking up dust or who knows what that is floating around these days
Posted by a reviewer on Amazon
I bought 2 they suck out any smell in the air and all of the dust
Review Count History
Price History
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