Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Blueair - 7770i | Blueair - Blue Pure 311i+ Max |
|---|---|---|
| Coverage | 100 m² | 35 m² |
| CADR | 900 m³/h | 500 m³/h |
| Min noise | 22 dB | 23 dB |
Between the 7770i and Blue Pure 311i+ Max, the 7770i comes out ahead in coverage / cadr, while the Blue Pure 311i+ Max wins on several specs. Overall, the 7770i scores 93.1 and the Blue Pure 311i+ Max scores 77.4 on our Mars Score.
Which should you buy?
The 7770i is the clear pick on raw spec strength, leading by 15.7 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 7770i if you care most about coverage / cadr. The biggest gaps in its favor are coverage, cadr, min noise. The single most decisive one: Coverage — 185.71% more. 100 m² vs 35 m².
The Blue Pure 311i+ Max similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable true hepa h13+, activated carbon, so those specs do not separate the two — focus on the differences below.
Bottom line: the 7770i is the safer default. The other model is the right choice only when its specific advantages line up with your priorities.
Which should you buy: Blueair - 7770i or Blueair - Blue Pure 311i+ Max?
Blueair - 7770i leads the current Mars Score by 15.7 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 - 7770i if…
Blueair - 7770i has the measurable edge on coverage m2, cadr m3h, noise db min.
Choose Blueair - Blue Pure 311i+ Max if…
Blueair - Blue Pure 311i+ Max does not lead a decisive measured field here, so choose it for price, ecosystem, design, or availability when those matter more to you.
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 - 7770i wins
- ▲Coverage — 185.71% more. 100 m² vs 35 m².
- ▲CADR — 80.00% more. 900 m³/h vs 500 m³/h.
- ▲Min noise — 1.00 dB less. 22 vs 23.
Why Blueair - Blue Pure 311i+ Max wins
- No decisive advantages.
Spec comparison
Performance
| Spec | Blueair - 7770i | Blueair - Blue Pure 311i+ Max |
|---|---|---|
| CADR | 900 m³/hlead | 500 m³/h |
| Coverage | 100 m²lead | 35 m² |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Blueair - 7770i | Blueair - Blue Pure 311i+ Max |
|---|---|---|
| Min noise | 22 dBlead | 23 dB |
| Air quality sensor | true | true |
| Smart app | true | true |