Between the Blue Pure 311i+ Max and HPA300, the Blue Pure 311i+ Max comes out ahead in min noise, while the HPA300 wins on coverage and cadr. Overall, the Blue Pure 311i+ Max scores 61.3 and the HPA300 scores 65 on our Mars Score.
Which should you buy?
The HPA300 edges ahead on the Mars Score (61.3 vs 65), but the 3.7-point gap is small enough that the right pick comes down to which spec advantages matter to you.
Pick the Blue Pure 311i+ Max if you care most about min noise. The biggest gaps in its favor are min noise.
Pick the HPA300 if you care most about coverage and cadr. Its strongest claims are coverage, cadr.
Both ship with comparable true hepa h13+, activated carbon, so those specs don't 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 tells you both are well-rounded; the differences are about trade-offs, not quality.
Why Blueair - Blue Pure 311i+ Max wins
- ▲Min noise — 9.00 dB less. 23 vs 32.
Why Honeywell - HPA300 wins
- ▲Coverage — 25.71% more. 44 m² vs 35 m².
- ▲CADR — 2.00% more. 510 m³/h vs 500 m³/h.
Spec comparison
Performance
| Spec | Blueair - Blue Pure 311i+ Max | Honeywell - HPA300 |
|---|---|---|
| CADR | 500 m³/h | 510 m³/hlead |
| Coverage | 35 m² | 44 m²lead |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Blueair - Blue Pure 311i+ Max | Honeywell - HPA300 |
|---|---|---|
| Min noise | 23 dBlead | 32 dB |
| Air quality sensor | truelead | false |
| Smart app | truelead | false |
Frequently asked
Spec-level deep dives
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