Head to head

Coway Airmega 400 vs Blueair Blue Pure 211+ Auto

Coway Airmega 400 leads 4 to 2 on the 6 rankable specs, but Blueair Blue Pure 211+ Auto costs $210 less.

Catalog as of September 1, 2026

Why, in numbers

CADR: Coway Airmega 400 lists 350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) (Coway sheet, 2026-09-02); Blueair Blue Pure 211+ Auto lists 353 CFM (Smoke), 347 CFM (Dust), 380 CFM (Pollen) (Blueair sheet, 2026-09-02).
Coverage area: Coway Airmega 400 lists 1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) (Coway sheet, 2026-09-02); Blueair Blue Pure 211+ Auto lists 550 sq ft (4.8 air changes/hr) / 1,320 sq ft (2 air changes/hr) (Blueair sheet, 2026-09-02).
Room size: Coway Airmega 400 lists Large living rooms, open floor plans, offices (Coway sheet, 2026-09-02); Blueair Blue Pure 211+ Auto lists Large living rooms, open floor plans, master suites (Blueair sheet, 2026-09-02).
Filter types: Coway Airmega 400 lists Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon) (Coway sheet, 2026-09-02); Blueair Blue Pure 211+ Auto lists Washable fabric pre-filter + HEPASilent main filter (Particle + Carbon) (Blueair sheet, 2026-09-02).
Filter life: Coway Airmega 400 lists 12 months (Max2 filter) / Washable pre-filters (Coway sheet, 2026-09-02); Blueair Blue Pure 211+ Auto lists 6 months (Blueair sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Coway Airmega 400

$5494 spec wins

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Blueair Blue Pure 211+ Auto

$3392 spec wins

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Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 4 to 2

Buy the Coway Airmega 400.

Leads 4 of 6 rankable overall specs; Blueair Blue Pure 211+ Auto takes 2.
Coverage area: 1,560 sq ft vs 550 sq ft
Filter life: 12 months vs 6 months
Blueair Blue Pure 211+ Auto is $210 cheaper. Pay the difference only if coverage area matters to you.

4 Coway Airmega 4006 rankable of 11 specsBlueair Blue Pure 211+ Auto 2

Deal-breakers

tick what would make you walk away

No Wi-Fi approw
No schedules or remote control from your phone.
Trips:Coway Airmega 400 · Smart Auto Mode + Eco ModeTrips:Blueair Blue Pure 211+ Auto · One-touch Auto Mode
Over 55 dB on highrow
Louder than normal conversation at full speed.
Clear:Coway Airmega 400 · 22 dB (Sleep mode) – 52 dB (Max speed)Trips:Blueair Blue Pure 211+ Auto · 23 dB (Low) – 56 dB (Turbo high)
Under 1,000 sq ft coveragerow
Undersized for an open-plan living area.
Clear:Coway Airmega 400 · 1,560 sq ftTrips:Blueair Blue Pure 211+ Auto · 550 sq ft

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Coway

350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)

Blueair

353 CFM (Smoke), 347 CFM (Dust), 380 CFM (Pollen)

Coverage area

Coway

1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)

Blueair

550 sq ft (4.8 air changes/hr) / 1,320 sq ft (2 air changes/hr)

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons

Coway Airmega 400

Upfront list price$549

3-Yr Dual Max2 Filter Set (Every 12 months (~$90/yr set))+$270

3-Year Estimated Total$819

Blueair Blue Pure 211+ Auto

Upfront list price$339

3-Yr Foldable Particle+Carbon filter (Every 6 months (~$45/yr))+$135

3-Year Estimated Total$474

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Coway: What to watch for

Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Blueair: What to watch for

Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Coway Airmega 400$5494 wins

Blueair Blue Pure 211+ Auto$3392 wins

Performance Filters Usability & Smart Design & Ownership

11 of 11 attributes differ. Identical rows are dimmed.

Performance

3 differences

Performance specifications. Middle column is Coway Airmega 400, right column is Blueair Blue Pure 211+ Auto.
CADR	350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)	353 CFM (Smoke), 347 CFM (Dust), 380 CFM (Pollen) (wins this row: higher)
Room size	Large living rooms, open floor plans, offices	Large living rooms, open floor plans, master suites
Coverage area	1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) (wins this row: higher)	550 sq ft (4.8 air changes/hr) / 1,320 sq ft (2 air changes/hr)

Filters

leads 1-0

Filters specifications. Middle column is Coway Airmega 400, right column is Blueair Blue Pure 211+ Auto.
Filter types	Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon)	Washable fabric pre-filter + HEPASilent main filter (Particle + Carbon)
Filter life	12 months (Max2 filter) / Washable pre-filters (wins this row: higher)	6 months

Usability & Smart

leads 1-0

Usability & Smart specifications. Middle column is Coway Airmega 400, right column is Blueair Blue Pure 211+ Auto.
Noise levels	22 dB (Sleep mode) – 52 dB (Max speed) (wins this row: lower)	23 dB (Low) – 56 dB (Turbo high)
Energy consumption	66 W max power consumption (Energy Star Certified)	38 W max power consumption
Smart features	Smart Auto Mode + Eco Mode (no Wi-Fi app)	One-touch Auto Mode (no Wi-Fi app)
Air quality sensors	Real-time particle sensor with colorful LED ring indicator	Integrated particle sensor with 3-color air quality LED indicator

Design & Ownership

2 differences

Design & Ownership specifications. Middle column is Coway Airmega 400, right column is Blueair Blue Pure 211+ Auto.
Weight	24.7 lb (11.2 kg)	12.5 lb (5.7 kg) (wins this row: lower)
Warranty	5 years limited motor / 1 year electronic parts (wins this row: higher)	2 years (with product registration)

Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.

Coway Airmega 400 source Blueair Blue Pure 211+ Auto source

Which one should you buy

Pick this one if

Coway Airmega 400

Dual-suction large room air purifier with Max2 HEPA and activated carbon filtration covering 1,560 sq ft.

Massive CADR cleans up to 1,560 sq ft twice per hour
Dual-sided air intake with combined True HEPA and carbon filters
Smart Eco mode turns off fan when air remains clean for 30 minutes

What you give up

Cube design has a large floor footprint
No mobile app connectivity on the non-S model

Full Coway Airmega 400 specs →

Pick this one if

Blueair Blue Pure 211+ Auto

High-capacity large-room air purifier with 360-degree HEPASilent filtration and machine-washable fabric pre-filters.

High 353 CFM CADR cleans a 550 sq ft living room in just 12.5 minutes
HEPASilent electrostatic + mechanical filtration maximizes airflow and efficiency
Interchangeable washable fabric pre-filters in multiple designer colors

What you give up

No mobile app or Wi-Fi schedule controls (one-button operation)
Reaches 56 dB at highest turbo fan setting

Full Blueair Blue Pure 211+ Auto specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

Tied on bedrooms. Blueair Blue Pure 211+ Auto is cheaper.

The 2 rankable bedrooms specs split 1 to 1.
Saves $210 at list price.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

For big rooms & allergies, buy the Coway Airmega 400.

Leads 2 of 3 rankable big rooms & allergies specs; Blueair Blue Pure 211+ Auto takes 1.
Coverage area: 1,560 sq ft vs 550 sq ft
Filter life: 12 months vs 6 months
Blueair Blue Pure 211+ Auto is $210 cheaper. Pay the difference only if coverage area matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

For low running cost, buy the Coway Airmega 400.

Leads 2 of 2 rankable low running cost specs.
Filter life: 12 months vs 6 months
Warranty: 5 years limited motor / 1 year electronic… vs 2 years
Blueair Blue Pure 211+ Auto is $210 cheaper. Pay the difference only if filter life matters to you.

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Coway Airmega 400 spec sheet Blueair Blue Pure 211+ Auto spec sheet

Manufacturer pages: Coway Airmega 400 ↗ · Blueair Blue Pure 211+ Auto ↗

Common questions

Which is cheaper, the Coway Airmega 400 or the Blueair Blue Pure 211+ Auto?

Blueair Blue Pure 211+ Auto costs $210 less at list price.

What is the biggest catch with the Coway Airmega 400 or Blueair Blue Pure 211+ Auto?

Both has this deal-breaker: no Wi-Fi app. No schedules or remote control from your phone.

Which is better for bedrooms, the Coway Airmega 400 or the Blueair Blue Pure 211+ Auto?

Tied on bedrooms. Blueair Blue Pure 211+ Auto is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $210 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 5 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.

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