Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coway - Airmega 400 | IQAir - HealthPro Plus |
|---|---|---|
| CADR | 705 m³/h | 470 m³/h |
| Coverage | 60 m² | 85 m² |
| Min noise | 22 dB | 25 dB |
Between the Airmega 400 and HealthPro Plus, the Airmega 400 comes out ahead in cadr / min noise, while the HealthPro Plus wins on coverage. Overall, the Airmega 400 scores 85.4 and the HealthPro Plus scores 83.6 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (85.4 vs 83.6). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the Airmega 400 if you care most about cadr / min noise. The biggest gaps in its favor are cadr, min noise. The single most decisive one: CADR — 50.00% more. 705 m³/h vs 470 m³/h.
Pick the HealthPro Plus if you care most about coverage. Its strongest claims are coverage. The single most decisive one: Coverage — 41.67% more. 85 m² vs 60 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: Coway - Airmega 400 or IQAir - HealthPro Plus?
Coway - Airmega 400 leads the current Mars Score by 1.8 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 Coway - Airmega 400 if…
Coway - Airmega 400 has the measurable edge on cadr m3h, noise db min.
Choose IQAir - HealthPro Plus if…
IQAir - HealthPro Plus 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 Coway - Airmega 400 wins
- ▲CADR — 50.00% more. 705 m³/h vs 470 m³/h.
- ▲Min noise — 3.00 dB less. 22 vs 25.
Why IQAir - HealthPro Plus wins
- ▲Coverage — 41.67% more. 85 m² vs 60 m².
Spec comparison
Performance
| Spec | Coway - Airmega 400 | IQAir - HealthPro Plus |
|---|---|---|
| CADR | 705 m³/hlead | 470 m³/h |
| Coverage | 60 m² | 85 m²lead |
| True HEPA H13+ | true | true |
| Activated carbon | true | true |
Smart & Noise
| Spec | Coway - Airmega 400 | IQAir - HealthPro Plus |
|---|---|---|
| Min noise | 22 dBlead | 25 dB |
| Air quality sensor | truelead | false |
| Smart app | truelead | false |