The Coway Airmega 400S and Airmega ProX are both designed for large indoor spaces and feature Coway’s HyperCaptive filtration system. While they share a focus on clean air, they differ in coverage, price, and smart features. Here’s a straightforward look at both models, based only on product descriptions and user reviews.
Coverage
The product description states that the Airmega 400S is designed to clean spaces up to 1,560 square feet in 30 minutes.
The product description states that the Airmega ProX covers up to 2,126 square feet and lists CADR ratings of Dust 580 / Pollen 450 / Smoke 567.
Filtration
The product description states that the Airmega 400S uses a HyperCaptive filtration system made up of a pre-filter, deodorization filter, and True HEPA filter. It reduces 99.999% of 0.01-micron particles and 99% of VOCs and odors.
The product description states that the Airmega ProX also uses Coway’s HyperCaptive system, combining activated carbon and a True HEPA filter. It reduces 99.999% of particles down to 0.01 microns, more than 99% of VOCs, and additionally reduces fumes such as NH3 and CH3CHO.
Smart Features and Controls
The product description states that the Airmega 400S includes the IoCare mobile app, which provides indoor and outdoor air quality monitoring, filter notifications, scheduling, and speed/smart mode control. It is also compatible with Amazon Alexa and Dash Replenishment.
The product description for the Airmega ProX does not mention app support, voice control, or third-party integration. It instead highlights on-device Auto Mode and Eco Mode.
Auto Modes and Energy Use
The product description states that the Airmega 400S has Smart Mode, which adjusts fan speed based on air quality, Eco Mode, which turns off the fan after 30 minutes of clean air, and Sleep Mode, which lowers noise and power use when the room is dark and clean.
The product description states that the Airmega ProX has Auto Mode, which adjusts the fan speed between three levels, and Eco Mode, which stops the fan after 30 minutes with no detected pollution. The description does not mention a Sleep Mode.
Fan Control
The product description for the Airmega 400S highlights app-based speed and smart-mode control but does not specify the number of manual speed stages.
The product description for the Airmega ProX states that manual fan speeds can be set at three levels.
Indicators and Maintenance
The product description states that the Airmega 400S provides filter alerts, a 24/7 air quality indicator, and a timer with options for 1, 4, or 8 hours.
The product description states that the Airmega ProX has a filter replacement indicator for both the pre-filter and the HEPA filter, along with real-time air quality monitoring.
Warranty
The product description states that the Airmega 400S comes with a 5-year limited manufacturer’s warranty.
The product description for the Airmega ProX does not mention warranty details.
Reviewer Impressions of the Airmega 400S
Reviewers have noted that the smart features of the Airmega 400S are practical in daily life. Some described how the unit automatically increases airflow when it detects contaminants during activities like cooking or vacuuming. Others appreciated the app’s ability to display real-time and past air quality.
Reviewers have also noted noise levels by fan setting. One review described Level 1 as nearly silent, Level 2 as noticeable but manageable, and Level 3 as loud.
Maintenance comments come from reviews, not the product description. Reviewers noted that the pre-filter requires washing every 2–3 weeks. One reviewer stated that the main filters are rated to last around one year, though this was based on their experience rather than official documentation. The product description does not include details about filter lifespan or maintenance costs.
Some reviewers shared personal impressions of improved allergy or respiratory symptoms after using the purifier. These are anecdotal experiences and not product-description claims.
Reviewer Impressions of the Airmega ProX
No user reviews were provided in the source material for the Airmega ProX. All details above about this model come solely from the product description.
Conclusion
The product description shows that the Airmega 400S is the more affordable option with smart features, app control, and integration with Alexa. Reviewers have noted it offers useful automation, though they also described noticeable noise at higher speeds and the need for regular filter maintenance.
The product description shows that the Airmega ProX is designed for larger spaces, with higher listed CADR values and straightforward manual control. It emphasizes coverage and filtration strength but does not include smart-home integration or warranty details in the provided description.
If you want smart features at a lower price, the Airmega 400S is appealing. If you need maximum coverage for a very large room, the Airmega ProX fits better.
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