Between the Blue Pure 311i+ Max and Core 300S, the Blue Pure 311i+ Max comes out ahead in cadr and coverage, while the Core 300S wins on several specs. Overall, the Blue Pure 311i+ Max scores 61.3 and the Core 300S scores 43 on our Mars Score.
Which should you buy?
The Blue Pure 311i+ Max is the clear pick on raw spec strength, leading by 18.3 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 cadr and coverage. The biggest gaps in its favor are cadr, coverage, true hepa h13+, among others.
The Core 300S similarly doesn't carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable activated carbon, so those specs don't separate the two — focus on the differences below.
Bottom line: the Blue Pure 311i+ Max 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
- ▲CADR — 117.39% more. 500 m³/h vs 230 m³/h.
- ▲Coverage — 75.00% more. 35 m² vs 20 m².
- ▲Has True HEPA H13+.
- ▲Min noise — 1.00 dB less. 23 vs 24.
Why Levoit - Core 300S wins
- No decisive advantages.
Spec comparison
Performance
| Spec | Blueair - Blue Pure 311i+ Max | Levoit - Core 300S |
|---|---|---|
| CADR | 500 m³/hlead | 230 m³/h |
| Coverage | 35 m²lead | 20 m² |
| True HEPA H13+ | truelead | false |
| Activated carbon | true | true |
Smart & Noise
| Spec | Blueair - Blue Pure 311i+ Max | Levoit - Core 300S |
|---|---|---|
| Min noise | 23 dBlead | 24 dB |
| Air quality sensor | true | true |
| Smart app | true | true |
Frequently asked
Spec-level deep dives
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