Blueair - Blue Pure 311i+ Max 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 | Blueair - Blue Pure 311i+ Max | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| Coverage | 35 m² | 60 m² |
| Min noise | 23 dB | 32 dB |
Between the Blue Pure 311i+ Max and Mi Smart Air Purifier 4 Pro, the Blue Pure 311i+ Max comes out ahead in min noise, while the Mi Smart Air Purifier 4 Pro wins on coverage. Overall, the Blue Pure 311i+ Max scores 77.4 and the Mi Smart Air Purifier 4 Pro scores 76.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (77.4 vs 76.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Blue Pure 311i+ Max if you care most about min noise. The biggest gaps in its favor are min noise. The single most decisive one: Min noise — 9.00 dB less. 23 vs 32.
Pick the Mi Smart Air Purifier 4 Pro if you care most about coverage. Its strongest claims are coverage. The single most decisive one: Coverage — 71.43% more. 60 m² vs 35 m².
Both ship with comparable cadr, true hepa h13+, activated carbon, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Blueair - Blue Pure 311i+ Max or Xiaomi - Mi Smart Air Purifier 4 Pro?
Blueair - Blue Pure 311i+ Max leads the current Mars Score by 0.7 points.The more useful decision is the trade-off behind that result: compare coverage, min noise against the way you will actually use the product.
Choose Blueair - Blue Pure 311i+ Max if…
Blueair - Blue Pure 311i+ Max has the measurable edge on noise db min.
Choose Xiaomi - Mi Smart Air Purifier 4 Pro if…
Xiaomi - Mi Smart Air Purifier 4 Pro has the measurable edge on coverage m2.
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 Blueair - Blue Pure 311i+ Max wins
- ▲Min noise — 9.00 dB less. 23 vs 32.
Why Xiaomi - Mi Smart Air Purifier 4 Pro wins
- ▲Coverage — 71.43% more. 60 m² vs 35 m².
Spec comparison
Performance
| Spec | Blueair - Blue Pure 311i+ Max | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| CADR | 500 m³/h | 500 m³/h |
| Coverage | 35 m² | 60 m²lead |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Blueair - Blue Pure 311i+ Max | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| Min noise | 23 dBlead | 32 dB |
| Air quality sensor | true | true |
| Smart app | true | true |