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Appliances head-to-head

Coway Airmega 400vsMedify MA-40

Coway Airmega 400 edges Medify MA-40, 8.0 to 7.4. The 5 axes split 4-1, widest on Durability at 1.8.

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.

Medify MA-40

Medify Air

7.4

H13 filtration and real throughput, undercut by a headline room figure and a loud lowest speed.

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 Durability, Coway Airmega 400 ahead 8.4 to 6.6. They come closest on Performance, 9.0 to 8.6. Left of center is Coway Airmega 400, right is Medify MA-40.

Coway Airmega 400 versus Medify MA-40 — axis scores out of 10Horizontal bar chart of editorial scores out of 10 across 5 axes. Bars for Coway Airmega 400 run left from the axis labels, bars for Medify MA-40 run right. Coway Airmega 400: Performance 9.0, Value 7.0, Durability 8.4, Ease of use 8.2, Quietness 7.6. Medify MA-40: Performance 8.6, Value 8.0, Durability 6.6, Ease of use 7.6, Quietness 6.2.Coway Airmega 400 (left)Medify MA-40 (right)PerformanceCoway Airmega 400 — Performance 9.0 out of 109.0Medify MA-40 — Performance 8.6 out of 108.6ValueCoway Airmega 400 — Value 7.0 out of 107.0Medify MA-40 — Value 8.0 out of 108.0DurabilityCoway Airmega 400 — Durability 8.4 out of 108.4Medify MA-40 — Durability 6.6 out of 106.6Ease of useCoway Airmega 400 — Ease of use 8.2 out of 108.2Medify MA-40 — Ease of use 7.6 out of 107.6QuietnessCoway Airmega 400 — Quietness 7.6 out of 107.6Medify MA-40 — Quietness 6.2 out of 106.2Editorial score out of 10 — higher is better

Which one to pick

Take the Coway Airmega 400

Leads on Performance, Durability, Ease of use and Quietness.

  • 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

Take the Medify MA-40

Leads on Value.

  • Smoke season, when you want throughput now and will tolerate the fan
  • A living room, an office, or a workshop rather than anywhere anyone sleeps
  • You want H13 filtration without paying what the boutique brands ask

What each one gets wrong

Coway Airmega 400

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

Medify MA-40

  • The lowest speed is rated at 46 dB — it never disappears into a quiet room
  • You read the room-size figure as comparable to a CADR-based rating
  • Registration inside ninety days and genuine filters are both warranty conditions

Specs, side by side

SpecCoway Airmega 400Medify MA-40
CoverageVery large roomsRated by Medify at 1,793 sq ft in one hour
FilterDual intake, HEPA plus carbon—
SensorLaser particle sensor, four-color indicator—
Filtration—Three stages with an H13 HEPA layer
Noise—46 to 66 dB across four speeds
Filter life—About 3,000 hours, roughly six months of daily use

Rankings they both appear in

Questions

Coway Airmega 400 or Medify MA-40 — which should I buy?
Coway Airmega 400 leads on Performance, Durability, Ease of use and Quietness. If Value matters more to you, take the Medify MA-40 instead.
Is 0.6 a real difference?
Barely. Coway Airmega 400 averages 8.0 and Medify MA-40 averages 7.4, and the total is the plain average of 5 axes, so 0.6 is what one axis moving 3.0 looks like after averaging. The axis split, 4-1, tells you more.
Which one ranks higher in "Throughput is cheap in a room nobody sleeps in"?
Coway Airmega 400 sits at #1 in "Throughput is cheap in a room nobody sleeps in", Medify MA-40 at #4.