Coway - Airmega 400 vs Xiaomi - Mi Smart Air Purifier 4 Pro
Between the Airmega 400 and Mi Smart Air Purifier 4 Pro, the Airmega 400 comes out ahead in cadr and min noise, while the Mi Smart Air Purifier 4 Pro wins on several specs. Overall, the Airmega 400 scores 78.3 and the Mi Smart Air Purifier 4 Pro scores 70.3 on our Mars Score.
Which should you buy?
The Airmega 400 is the clear pick on raw spec strength, leading by 8.0 points on the Mars Score. The margin is wide enough that the underdog only makes sense if its individual strengths line up with what you specifically need.
Pick the Airmega 400 if you care most about cadr and min noise. The biggest gaps in its favor are cadr, min noise.
The Mi Smart Air Purifier 4 Pro similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable coverage, true hepa h13+, activated carbon, so those specs don't separate the two — focus on the differences below.
Bottom line: the Airmega 400 is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Why Coway - Airmega 400 wins
- ▲CADR — 41.00% more. 705 m³/h vs 500 m³/h.
- ▲Min noise — 10.00 dB less. 22 vs 32.
Why Xiaomi - Mi Smart Air Purifier 4 Pro wins
- No decisive advantages.
Spec comparison
Performance
| Spec | Coway - Airmega 400 | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| CADR | 705 m³/hlead | 500 m³/h |
| Coverage | 60 m² | 60 m² |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Coway - Airmega 400 | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| Min noise | 22 dBlead | 32 dB |
| Air quality sensor | true | true |
| Smart app | true | true |
Frequently asked
Spec-level deep dives
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