Honeywell - HPA300 vs Xiaomi - Mi Smart Air Purifier 4 Pro
Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Honeywell - HPA300 | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| Coverage | 44 m² | 60 m² |
| CADR | 510 m³/h | 500 m³/h |
Between the HPA300 and Mi Smart Air Purifier 4 Pro, the HPA300 comes out ahead in cadr, while the Mi Smart Air Purifier 4 Pro wins on coverage. Overall, the HPA300 scores 74.4 and the Mi Smart Air Purifier 4 Pro scores 76.7 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (74.4 vs 76.7). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the HPA300 if you care most about cadr. The biggest gaps in its favor are cadr. The single most decisive one: CADR — 2.00% more. 510 m³/h vs 500 m³/h.
Pick the Mi Smart Air Purifier 4 Pro if you care most about coverage. Its strongest claims are coverage. The single most decisive one: Coverage — 36.36% more. 60 m² vs 44 m².
Both ship with comparable true hepa h13+, activated carbon, min noise, 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: Honeywell - HPA300 or Xiaomi - Mi Smart Air Purifier 4 Pro?
Xiaomi - Mi Smart Air Purifier 4 Pro leads the current Mars Score by 2.3 points.The more useful decision is the trade-off behind that result: compare cadr, coverage against the way you will actually use the product.
Choose Honeywell - HPA300 if…
Honeywell - HPA300 has the measurable edge on cadr m3h.
Choose Xiaomi - Mi Smart Air Purifier 4 Pro if…
Xiaomi - Mi Smart Air Purifier 4 Pro has the measurable edge on coverage m2.
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 Honeywell - HPA300 wins
- ▲CADR — 2.00% more. 510 m³/h vs 500 m³/h.
Why Xiaomi - Mi Smart Air Purifier 4 Pro wins
- ▲Coverage — 36.36% more. 60 m² vs 44 m².
Spec comparison
Performance
| Spec | Honeywell - HPA300 | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| CADR | 510 m³/hlead | 500 m³/h |
| Coverage | 44 m² | 60 m²lead |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Honeywell - HPA300 | Xiaomi - Mi Smart Air Purifier 4 Pro |
|---|---|---|
| Min noise | 32 dB | 32 dB |
| Air quality sensor | false | truelead |
| Smart app | false | truelead |