Blueair Blue Pure 311I Max vs Coway Airmega 400S
Verdict: The Coway Airmega 400S outperforms the Blueair Blue Pure 311i Max in raw CADR (350 cfm vs 300 cfm) and offers smart app integration, making it the stronger choice for large homes (RTINGS, Consumer Reports). However, the Blueair is quieter at low speeds (33 dB vs 33 dB min but peaks lower) and fits tighter spaces, so it remains a solid mid‑range option (RTINGS).
Winner: Coway Airmega 400S
Blueair Blue Pure 311I Max: 7.5/10
Coway Airmega 400S: 8/10
Spec-by-spec comparison
| Blueair Blue Pure 311I Max | Coway Airmega 400S | |
|---|---|---|
| CADR (cfm) | 300 | 350 |
| Coverage (sq ft) | 775 | 1,560 |
| Filter Type | HEPA + Activated Carbon | HEPA + Activated Carbon |
| Noise (dB) | 33-56 | 33-64 |
Blueair Blue Pure 311I Max
What works
- High CADR for its size
- Quiet operation at low fan speeds
- Simple one‑button control
What doesn't
- Limited smart integration
- Filter replacement cost is high
Coway Airmega 400S
What works
- Largest coverage area
- Dual‑fan design for efficient airflow
- App control and real‑time air‑quality monitoring
What doesn't
- Larger footprint
- Higher price point
Bottom line
Our pick: Coway Airmega 400S.
People also ask
How does Winix 5500-2 vs Coway Airmega 400S compare?
The Winix 5500-2 uses a 3-stage filtration system with plasma wave technology, while the Coway Airmega 400S employs dual filtration and smart app controls. The Coway covers larger spaces with higher CADR ratings than the Winix.
View full comparison on GoodPickr
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