Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Coway - Airmega 400 | Levoit - Core 300S |
|---|---|---|
| CADR | 705 m³/h | 230 m³/h |
| Coverage | 60 m² | 20 m² |
| Min noise | 22 dB | 24 dB |
| True HEPA H13+ | true | false |
Between the Airmega 400 and Core 300S, the Airmega 400 comes out ahead in cadr / coverage, while the Core 300S wins on several specs. Overall, the Airmega 400 scores 85.4 and the Core 300S scores 55.8 on our Mars Score.
Which should you buy?
The Airmega 400 is the clear pick on raw spec strength, leading by 29.6 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 Airmega 400 if you care most about cadr / coverage. The biggest gaps in its favor are cadr, coverage, min noise, among others. The single most decisive one: CADR — 206.52% more. 705 m³/h vs 230 m³/h.
The Core 300S similarly does not carry a headline advantage on the popular specs — look at the full table for category-specific deltas.
Both ship with comparable activated carbon, so those specs do not separate the two — focus on the differences below.
Bottom line: the Airmega 400 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: Coway - Airmega 400 or Levoit - Core 300S?
Coway - Airmega 400 leads the current Mars Score by 29.6 points.The more useful decision is the trade-off behind that result: compare cadr, coverage, true hepa h13+, 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, coverage m2, noise db min.
Choose Levoit - Core 300S if…
Levoit - Core 300S 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 Coway - Airmega 400 wins
- ▲CADR — 206.52% more. 705 m³/h vs 230 m³/h.
- ▲Coverage — 200.00% more. 60 m² vs 20 m².
- ▲Min noise — 2.00 dB less. 22 vs 24.
- ▲Has True HEPA H13+.
Why Levoit - Core 300S wins
- No decisive advantages.
Spec comparison
Performance
| Spec | Coway - Airmega 400 | Levoit - Core 300S |
|---|---|---|
| CADR | 705 m³/hlead | 230 m³/h |
| Coverage | 60 m²lead | 20 m² |
| True HEPA H13+ | truelead | false |
| Activated carbon | true | true |
Smart & Noise
| Spec | Coway - Airmega 400 | Levoit - Core 300S |
|---|---|---|
| Min noise | 22 dBlead | 24 dB |
| Air quality sensor | true | true |
| Smart app | true | true |