Blueair - Blue Pure 311i+ Max vs Xiaomi - Mi Smart Air Purifier 4 Pro
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 61.3 and the Mi Smart Air Purifier 4 Pro scores 70.3 on our Mars Score.
Which should you buy?
The Mi Smart Air Purifier 4 Pro is the clear pick on raw spec strength, leading by 9.0 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 Blue Pure 311i+ Max if you care most about min noise. The biggest gaps in its favor are min noise.
Pick the Mi Smart Air Purifier 4 Pro if you care most about coverage. Its strongest claims are coverage.
Both ship with comparable cadr, true hepa h13+, activated carbon, so those specs don't separate the two — focus on the differences below.
Bottom line: the Mi Smart Air Purifier 4 Pro is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
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 |
Frequently asked
Spec-level deep dives
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