Verdict: The Blueair Blue Pure 211i Max delivers strong value with 1,524 sq ft coverage, 46W consumption, and app/voice controls at $349. The Coway Airmega 400S provides superior 3,120 sq ft coverage and 3-stage HyperCaptive filtration but costs $749. Blueair is the better pick for most households based on the provided specs.
Blueair Blue Pure 211I Max lists at $349 while Coway Airmega 400S lists at $749 — Blueair Blue Pure 211I Max undercuts Coway Airmega 400S by $400 (115%).
Winner: Blueair Blue Pure 211i Max
Blueair Blue Pure 211I Max: 8/10
Coway Airmega 400S: 7/10
| Blueair Blue Pure 211I Max | Coway Airmega 400S | |
|---|---|---|
| coverage_sqft | 1,524 sq ft in 30 min | 3,120 sq ft |
| filtration_type | HEPASilent dual filtration | 3-stage HyperCaptive with Green True HEPA |
| power_consumption | 46W | — |
| connectivity | app & voice control, PM1/PM2.5/PM10 sensors | Wi-Fi app control with Auto, Eco, Sleep modes |
Our pick: Blueair Blue Pure 211i Max. That said, Blueair Blue Pure 211I Max still wins on low 46w power draw for efficient daily operation — consider it if that single trade matters most for your use.
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