Compare Air Purifier
Airmega 400 scores higher on safety - here's why.
The most important dimensions, side by side.
Feature-by-feature breakdown across 2 products
Coway
Dyson
Strengths
Strengths
Safety Score
9.2
Safety Score
9.0
Why it matters: Safety carries 50% of the overall score in our V4.2 rubric. We evaluate materials, certifications, and compliance across multiple criteria. Coway scored 9.2/10 vs Dyson's 9.0/10.
Coway
Dyson
Strengths
Strengths
Efficacy Score
9.4
BetterEfficacy Score
7.8
Why it matters: Our efficacy pillar (20% weight) measures real-world performance - how well the product delivers on its core function. Coway scored 9.4/10 vs Dyson's 7.8/10.
Overall Score
8.9
BetterOverall Score
7.6
Why it matters: Weighted average of all scoring dimensions.
CADR Smoke
150 CFM
CADR Smoke
450 CFM
BetterWhy it matters: Coway moves 3x more air - significant advantage for rapid room cleaning
Coverage Area
800 sq ft
Coverage Area
1560 sq ft
BetterWhy it matters: Coway covers nearly double the space
Smart Features
Full app + all platforms
BetterSmart Features
Basic app
Why it matters: Dyson integrates with HomeKit, Google, Alexa, SmartThings
Coway
Dyson
Strengths
Strengths
Weaknesses
Usability Score
8.5
BetterUsability Score
4.0
Why it matters: Usability (20% weight) covers daily convenience - ease of use, maintenance, and practical considerations. Coway scored 8.5/10 vs Dyson's 4.0/10.
Coway
Dyson
Strengths
Weaknesses
Strengths
Weaknesses
Price
$549
Price
$549
Why it matters: Lower price is better when quality is comparable.
Value Score
8.5
BetterValue Score
6.5
Why it matters: Value (10% weight) calculates quality per dollar. Coway: $62/point vs Dyson: $72/point. Lower cost-per-point means better value.
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Everything you need to make the call — who each one is for, and who should skip it.
Go for it if you...
Safety is your top priority — this product scores highest on material safety.
You want the best value for money in this category.
Performance is what matters most to you.
You want the lowest price option at $549.
Safety is your top priority — this product scores highest on material safety.
You want the lowest price option at $549.
Neither of these quite what you're looking for?
I've reviewed all Air Purifier options at every price pointEvery Air Purifier in our database is scored using R3's V4.2 deterministic rubric — the same inputs always produce the same score. For this comparison, we evaluated Coway and Dyson across 0 independent criteria: . No sponsored rankings. No paid placements.
Straight answers — no sponsored content, no filler.
I'd start with Coway Airmega 400 - it scored 8.9/10 overall in our V4.2 rubric. Safety carries 50% of our scoring weight, followed by performance (20%), usability (20%), and value (10%). Check which pillar matters most to your family and compare those specific scores.
We use our V4.2 deterministic rubric with four weighted pillars: Safety (50%), Efficacy (20%), Usability (20%), and Value (10%). Every score is reproducible - the same product data produces the same score. Each product is evaluated across multiple criteria within each pillar.
Not necessarily. The overall score reflects our weighted rubric, but your priorities may differ. If you care most about safety, compare the safety scores directly. If budget drives your decision, the value scores and prices tell a clearer story. The "right" pick is the one that matches what matters most to your family.
Not the right match? Explore these alternatives in the same category.
