Coway - Airmega 400 vs Xiaomi - Mi Smart Air Purifier 4 Pro
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coway - Airmega 400 | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| CADR | 705 m³/h | 500 m³/h |
| Min noise | 22 dB | 32 dB |
Between the Airmega 400 and Mi Smart Air Purifier 4 Pro, the Airmega 400 comes out ahead in cadr / min noise, while the Mi Smart Air Purifier 4 Pro wins on several specs. Overall, the Airmega 400 scores 85.4 and the Mi Smart Air Purifier 4 Pro scores 76.7 on our Mars Score.
Which should you buy?
The Airmega 400 is the clear pick on raw spec strength, leading by 8.7 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 / min noise. The biggest gaps in its favor are cadr, min noise. The single most decisive one: CADR — 41.00% more. 705 m³/h vs 500 m³/h.
The Mi Smart Air Purifier 4 Pro similarly does not 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 do not 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.
Which should you buy: Coway - Airmega 400 or Xiaomi - Mi Smart Air Purifier 4 Pro?
Coway - Airmega 400 leads the current Mars Score by 8.7 points.The more useful decision is the trade-off behind that result: compare cadr, min noise against the way you will actually use the product.
Choose Coway - Airmega 400 if…
Coway - Airmega 400 has the measurable edge on cadr m3h, noise db min.
Choose Xiaomi - Mi Smart Air Purifier 4 Pro if…
Xiaomi - Mi Smart Air Purifier 4 Pro does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
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 |