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 | Honeywell - HPA300 |
|---|---|---|
| Coverage | 35 m² | 44 m² |
| Min noise | 23 dB | 32 dB |
| CADR | 500 m³/h | 510 m³/h |
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 / cadr. Overall, the Blue Pure 311i+ Max scores 77.4 and the HPA300 scores 74.4 on our Mars Score.
Which should you buy?
The Blue Pure 311i+ Max edges ahead on the Mars Score (77.4 vs 74.4), but the 3.0-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. The single most decisive one: Min noise — 9.00 dB less. 23 vs 32.
Pick the HPA300 if you care most about coverage / cadr. Its strongest claims are coverage, cadr. The single most decisive one: Coverage — 25.71% more. 44 m² vs 35 m².
Both ship with comparable 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 Honeywell - HPA300?
Blueair - Blue Pure 311i+ Max leads the current Mars Score by 3.0 points.The more useful decision is the trade-off behind that result: compare cadr, 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 Honeywell - HPA300 if…
Honeywell - HPA300 has the measurable edge on coverage m2, cadr m3h.
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 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 |