Question 1

Which is better, Coway Airmega 400 or Blueair Blue Pure 311i+?

Accepted Answer

Based on our testing, the Coway Airmega 400 scores higher overall at 9/10. The Coway Airmega 400 scored 9/10 and the Blueair Blue Pure 311i+ scored 8.9/10 in our Best Air Purifiers for Large Rooms 2026 evaluation.

Question 2

Is the Coway Airmega 400 worth it over the Blueair Blue Pure 311i+?

Accepted Answer

The Coway Airmega 400 scores 9/10 while the Blueair Blue Pure 311i+ scores 8.9/10. The Coway Airmega 400 is our "Best Overall" pick in the Best Air Purifiers for Large Rooms 2026 category.

Coway Airmega 400 vs Blueair Blue Pure 311i+: Which to Buy?