Head-to-head · Best Air Purifiers

Blueair Blue Pure 211+ vs Coway Airmega 400S

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

The short answer

Coway Airmega 400S comes out ahead by a narrow margin (4.4 vs 4.5). The gap is mostly about Owners of large open-concept living areas — read the strengths below before deciding.

Ranked #2 in Best Air Purifiers

Blueair Blue Pure 211+

4.4

$319as of Apr 22

The Blueair Blue Pure 211+ is a powerful and stylish air purifier that excels in cleaning large rooms quickly while operating quietly on lower settings. Its simple one-button design and washable pre-filter offer convenience and long-term value, though the unit is heavy and lacks portability features. A significant drawback for some users is the inability to disable the built-in ionizer, and filter costs are notably higher than competitors.

Strengths

— Delivers 350 CFM CADR for dust, smoke, and pollen, effectively cleaning rooms up to 540 sq. ft.
— Operates quietly at 37.2 dB on low speed, which is quieter than a whisper or refrigerator hum.
— Features a washable, customizable fabric pre-filter that captures large particles like pet hair and lint.

Watch-outs

— The built-in ionizer cannot be disabled, which may be a concern for users avoiding ionization technology.
— The unit is bulky and lacks handles or wheels, making it difficult to move between rooms.
— Filter replacement costs are higher compared to other air purifiers with similar performance.

$319 · Check Price on Amazon Full review →

Higher ratedRanked #1 in Best Air Purifiers

Coway Airmega 400S

4.5

$749as of Apr 22

The Coway Airmega 400S is a powerful air purifier designed for large spaces, capable of cleaning up to 3,120 sq. ft. with exceptional speed and low noise in sleep mode. While it excels in air cleaning performance and offers convenient smart controls, its high operating costs and large physical footprint are notable drawbacks for potential buyers.

Strengths

— Covers spaces up to 3,120 sq. ft. with high efficiency
— Removes 100% of particulates in 45 minutes during testing
— Operates at whisper-quiet 22 dB in sleep mode

Watch-outs

— High operating cost due to expensive replacement filters
— Bulky dimensions (14.8" x 22.8" x 14.8") occupy significant floor space
— Requires a mobile app to access certain smart features

$749 · Check Price on Amazon Full review →

How they stack up

Blueair Blue Pure 211+

The Blueair Blue Pure 211+ stands out with its washable fabric pre-filter and minimalist one-button control, offering a simpler user experience than the app-dependent Coway Airmega 400S or Levoit Core 400S. However, it forces users to accept a built-in ionizer that cannot be disabled, a feature absent in the Coway and Levoit models, and it is less portable than the compact Levoit.

Coway Airmega 400S

The Coway Airmega 400S dominates in raw coverage power, cleaning spaces up to 3,120 sq. ft., which far exceeds the 540 sq. ft. limit of the Blueair Blue Pure 211+ and the 99 sq. ft. limit of the Dyson TP07. While it shares smart features with the Levoit Core 400S, the Coway is physically much bulkier and incurs higher long-term filter costs than the Levoit.

Specs side-by-side

Spec	Blueair Blue Pure 211+	Coway Airmega 400S
CADR	350 CFM	328 cfm
Room Coverage	540 sq. ft.	3,120 sq. ft.
Noise Level	37.2 dB	22 dB
Filtration System	HEPASilent + Ionizer	HyperCaptive (Pre-filter, Carbon, HEPA)
Dimensions	20H x 13W x 13D inches	14.8 x 22.8 x 14.8 inches
Weight	12.98 lbs	—
Power Consumption	54.5 watts	—
Filter Lifespan	6-8 months	—

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