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Appliances head-to-head

Blueair Blue Pure 211+vsCoway Airmega 400

Blueair Blue Pure 211+ edges Coway Airmega 400, 8.3 to 8.0. The 5 axes split 3-2, widest on Value at 1.2.

Blueair Blue Pure 211+

Blueair

8.3

Moves a large room's worth of air while staying quiet enough to forget about.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Coway Airmega 400

Coway

8.0

A heavy-duty purifier sized for the large open rooms most portable units quietly cannot handle.

Price and availability change constantly, so we don't quote them here — the link opens the current Amazon listing.

Where they diverge

The widest gap is Value, Blueair Blue Pure 211+ ahead 8.2 to 7.0. They come closest on Ease of use, 8.6 to 8.2. Left of center is Blueair Blue Pure 211+, right is Coway Airmega 400.

Blueair Blue Pure 211+ versus Coway Airmega 400 — axis scores out of 10Horizontal bar chart of editorial scores out of 10 across 5 axes. Bars for Blueair Blue Pure 211+ run left from the axis labels, bars for Coway Airmega 400 run right. Blueair Blue Pure 211+: Performance 8.4, Value 8.2, Durability 7.8, Ease of use 8.6, Quietness 8.6. Coway Airmega 400: Performance 9.0, Value 7.0, Durability 8.4, Ease of use 8.2, Quietness 7.6.Blueair Blue Pure 211+ (left)Coway Airmega 400 (right)PerformanceBlueair Blue Pure 211+ — Performance 8.4 out of 108.4Coway Airmega 400 — Performance 9.0 out of 109.0ValueBlueair Blue Pure 211+ — Value 8.2 out of 108.2Coway Airmega 400 — Value 7.0 out of 107.0DurabilityBlueair Blue Pure 211+ — Durability 7.8 out of 107.8Coway Airmega 400 — Durability 8.4 out of 108.4Ease of useBlueair Blue Pure 211+ — Ease of use 8.6 out of 108.6Coway Airmega 400 — Ease of use 8.2 out of 108.2QuietnessBlueair Blue Pure 211+ — Quietness 8.6 out of 108.6Coway Airmega 400 — Quietness 7.6 out of 107.6Editorial score out of 10 — higher is better

Which one to pick

Take the Blueair Blue Pure 211+

Leads on Value, Ease of use and Quietness.

  • An open-plan living space rather than a bedroom-sized box
  • You want one control and no app
  • The washable fabric sleeve catching pet hair appeals to you

Take the Coway Airmega 400

Leads on Performance and Durability.

  • A room large enough that smaller units cycle constantly
  • You want a sensor-driven auto mode that reacts to the room instead of a fixed speed
  • Dual-sided intake suits where the unit has to sit

What each one gets wrong

Blueair Blue Pure 211+

  • Seeing a particulate number is part of trusting the machine
  • Carbon filtration for cooking smells is a priority

Coway Airmega 400

  • Proprietary filters that cost real money every six months
  • Floor space is tight — the footprint is substantial

Specs, side by side

SpecBlueair Blue Pure 211+Coway Airmega 400
CoverageLarge roomsVery large rooms
FilterFabric pre-filter plus particle filterDual intake, HEPA plus carbon
ControlsOne button, three speeds—
Sensor—Laser particle sensor, four-color indicator

Rankings they both appear in

Questions

Blueair Blue Pure 211+ or Coway Airmega 400 — which should I buy?
Blueair Blue Pure 211+ leads on Value, Ease of use and Quietness. If Performance and Durability matter more to you, take the Coway Airmega 400 instead.
Is 0.3 a real difference?
Barely. Blueair Blue Pure 211+ averages 8.3 and Coway Airmega 400 averages 8.0, and the total is the plain average of 5 axes, so 0.3 is what one axis moving 1.5 looks like after averaging. The axis split, 3-2, tells you more.
Which one ranks higher in "Recompute a purifier's coverage and it shrinks"?
Blueair Blue Pure 211+ sits at #1 in "Recompute a purifier's coverage and it shrinks", Coway Airmega 400 at #3.