Our Verdict
BLUEAIR BLUEAIR Wins

It offers vastly superior coverage at 3385 sq ft and a CADR smoke of 2163.2, far exceeding Coway's 650 sq ft and 416.0 CADR. Choose Coway for a lower noise level (22 dB) and a 5-year warranty.
Bottom Line: BLUEAIR BLUEAIR is the better choice. It offers vastly superior coverage at 3385 sq ft and a CADR smoke of 2163.
Key Differences
The most significant spec differences at a glance
Cadr Smoke
420% moreCoverage Sq Ft
421% moreAdvantages
Where each product wins
BLUEAIR
- Cadr Smoke: 420% higher (2163.2 vs 416.0)
- Coverage Sq Ft: 421% higher (3385.0 vs 650.0)
Who Should Buy Which?
Find the right product for your needs
Buy BLUEAIR if...
BLUEAIR Air Purifier for
If you have a truly massive space, such as an open-concept home, a large basement, or even a small commercial area, the BLUEAIR Blue Signature is your ideal choice. With a remarkable 3385 sq ft coverage and a high smoke CADR of 2163.2, it's perfect for tackling severe odors, pet dander, or wildfire smoke quickly and efficiently. Its dual function as a side table also appeals to those seeking integrated, discreet home appliances.
Buy Coway if...
COWAY Air Purifiers for
The Coway 400G is best suited for individuals prioritizing the removal of the absolute finest airborne particles in medium-sized rooms (up to 650 sq ft). If you suffer from severe allergies, asthma, or are particularly concerned about ultrafine pollutants down to 0.01 microns, Coway's advanced True HEPA filtration is a key benefit. Its Smart and Eco modes offer convenient, energy-efficient operation, backed by a reassuring 5-year warranty, making it a reliable, long-term investment for a cleaner home environment.
Spec Comparison
8 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $450 | $649 |
| Rating | 4.6(177) | 4.4(6.5k) |
| Cadr Smoke | 2163.2 | 416 |
| Coverage Sq Ft | 3385 | 650 |
| Noise Level db Min | — | 22 dB |
| Filter Type | HEPASILENT | True HEPA |
| Smart Sensor | Yes | Yes |
| WiFi | Yes | — |
| Weight | — | 3.05 lbs |
| Energy Star | — | Yes |
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Pros & Cons
Quick overview of strengths and weaknesses
BLUEAIR Air Purifier
- Covers large areas up to 3385 sq ft.
- Removes 99.97% of particles down to 0.1 microns.
- High CADR of 2163.2 for smoke removal.
- OdorFence technology removes strong odors.
- Interactive display animations offer no utility.
- Requires recurring purchase of replacement filters.
- Optimal performance relies on WiFi connectivity.
Coway Air Purifiers
- Removes 99.999% of 0.01-micron particles.
- Covers 780 sq ft with 4 air changes per hour.
- Smart Mode adjusts fan speed based on air quality.
- Eco Mode shuts off fan when air is clean.
- Stated 3,120 sq ft coverage misleading for 4 ACH.
- True HEPA filters require periodic replacement.
- No remote control listed in features.
Frequently Asked Questions
Common questions about this comparison
Which air purifier is more effective for large rooms and heavy smoke?
The BLUEAIR BLUEAIR is superior, covering 3385 sq ft with a smoke CADR of 2163.2. Coway covers 650 sq ft with a CADR of 416.0, making BLUEAIR ideal for demanding environments.
What is the main difference in their particle filtration capabilities?
Coway removes 99.999% of 0.01-micron particles with True HEPA. BLUEAIR, with HEPASILENT, removes 99.97% of 0.1-micron particles. Coway filters finer particles, while BLUEAIR focuses on large room coverage.
How do the two purifiers compare in terms of noise output?
Coway explicitly states a minimum noise level of 22.0 dB, suggesting it is designed for quiet operation. The specifications for the BLUEAIR BLUEAIR air purifier do not include a minimum noise level.
Is there a significant difference in smart features or warranty?
Both offer smart sensors and auto modes. Coway includes a 5-year warranty. BLUEAIR is WiFi enabled and functions as a side table. Coway prioritizes warranty, while BLUEAIR emphasizes smart integration and dual functionality.
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