22 facts in comparison
Coway Airmega 400 vs Coway Airmega 200M
This comparison puts the Coway Airmega 400 and Coway Airmega 200M side by side — two Air Purifiers measured against the same 22-spec sheet, with every meaningful gap scored and explained. On our weighted VS Score the Coway Airmega 400 finishes ahead, 89 to 55 — a decisive result.
The single biggest measurable gap is air changes per hour: 2 vs 4.8. Street prices currently start at $ 388.99 for the Coway Airmega 400 and $ 196.76 for the Coway Airmega 200M. That is a $ 192.23 premium for the Coway Airmega 400 — worth keeping in mind as you read the score gaps below.
Where the Coway Airmega 400 beats the Coway Airmega 200M
- A higher CADR (smoke) ?328 CFM vs 246 CFM
- A higher coverage area ?508 sq ft vs 361 sq ft
- A slightly lower min noise level ?22 dB vs 24.4 dB
- A slightly lower max noise level ?52 dB vs 55.1 dB
- A lower power consumption ?66 W vs 82 W
- Has sleep mode ?
Where the Coway Airmega 200M beats the Coway Airmega 400
- A much higher air changes per hour ?4.8 vs 2
- More filtration stages ?4 vs 3
- A much lighter build ?6 kg vs 11.2 kg
- A more compact design ?465 mm vs 579 mm
Key real-world differences
The spec sheet pulls in both directions. These are the gaps big enough to shape the decision — with the actual figures, and what each one means in real-world use.
- Air changes per hourPerformance2 vs 4.8 — 2.4× more for the Coway Airmega 200M
How many times the air in the rated room is cycled each hour.
- Coverage areaPerformance508 sq ft vs 361 sq ft — 29% more for the Coway Airmega 400
The room size the purifier is rated to clean effectively.
- Sleep modeNoise & powerYes vs No — only the Coway Airmega 400 has it
A dimmed, near-silent mode for overnight use.
- Min noise levelNoise & power22 dB vs 24.4 dB — 10% less for the Coway Airmega 400
The lowest-speed noise output; quieter suits bedrooms.
On paper this is a win, but a gap this small is unlikely to be noticeable in daily use.
- WeightDesign11.2 kg vs 6 kg — 46% less for the Coway Airmega 200M
A lighter unit is easier to move between rooms.
Which one should you buy?
There is no single answer — it depends on what you will actually use it for. Match your priority to the pick below.
- Best for performance Coway Airmega 400 takes the category 73 to 27.
- Best for noise & power Coway Airmega 400 takes the category 100 to 0 — driven by sleep mode (Yes vs No).
- Best for design Coway Airmega 200M takes the category 100 to 0 — driven by weight (11.2 kg vs 6 kg).
- On a budget Coway Airmega 200M is the cheaper way in at $ 196.76, and still scores 55 overall.
- The safe all-rounder Coway Airmega 400 wins more of the categories that carry real weight, topping the overall VS Score at 89.
Where each one falls short
Coway Airmega 400
- Air changes per hour: 2 vs 4.8
- Weight: 11.2 kg vs 6 kg
- Filtration stages: 3 vs 4
Coway Airmega 200M
- Coverage area: 508 sq ft vs 361 sq ft
- CADR (smoke): 328 CFM vs 246 CFM
- Sleep mode: Yes vs No
What matters to you?
Drag the sliders to weight each category and re-rank the products to suit your priorities.
Score breakdown
How the VS Score works — and what it can’t tell you
Every measurable spec is scored relative to this matchup: the best value here earns 100%, the worst 0%, and everything between scales linearly. Each spec then counts according to an editorial weight that reflects real-world impact — a battery-capacity gap moves the score far more than a colour-options list. The category scores above are the weighted results inside each group, and the overall VS Score rolls all of them together; the evidence line under each category names the specs that actually decided it.
Unknown values are never estimated. A spec a product doesn’t report simply drops out of that product’s scoring — it isn’t penalised with a guess — and a spec only one side reports can never produce a “win”. The trade-off is honest but real: a thinner spec sheet means a score built on fewer data points, which is why the completeness figures are disclosed under About this data.
Most importantly: a spec-sheet lead is not the same as a better product. Megapixels, gigahertz and benchmark points describe capacity, not experience — image processing, software optimisation, thermals, haptics and ergonomics decide how a device actually feels, and no table captures reliability or long-term support quality. Treat the scores as a structured summary of what can be measured, read the caveats under each key difference, and use the weight tuner to re-rank the comparison by what matters to you.
Performance
Clean Air Delivery Rate — how quickly smoke particles are scrubbed from the air.
The room size the purifier is rated to clean effectively.
How many times the air in the rated room is cycled each hour.
The number of filtration layers air passes through.
Filtration
A certified HEPA filter captures 99.97% of 0.3-micron particles.
The HEPA grade of the main filter (e.g. H13).
A carbon layer absorbs odours, smoke and VOCs.
Pellet-based carbon beds absorb more odour than thin coated sheets.
A rinseable pre-filter catches hair and large dust to extend filter life.
How long the main filter lasts before replacement.
Noise & power
The lowest-speed noise output; quieter suits bedrooms.
Noise at full speed; lower is better.
Maximum power draw; lower costs less to run continuously.
A dimmed, near-silent mode for overnight use.
Design
A lighter unit is easier to move between rooms.
The height of the unit.
Smart features
Measures particle levels to show and react to air quality.
Adjusts fan speed automatically based on measured air quality.
Control and monitor it from a phone app.
Works with Alexa and Google Assistant.
Tells you when the filter needs replacing.
Schedule the purifier to switch off automatically.
About this data
- Specifications are compiled from each manufacturer’s official spec sheet, cross-checked against trusted specification databases, and normalised into one schema so identical things are compared identically.
- Specifications last verified August 21, 2026.
- Data completeness: Coway Airmega 400 100% and Coway Airmega 200M 100% of the 22 specs in this category. Anything we could not verify is shown as Unknown — never estimated — and is excluded from all scores.
- Prices and availability come from live retailer feeds via our shopping partners and refresh throughout the day; a missing price means no partner currently lists the product, not that it is discontinued.
- Want the full picture? Our editorial guidelines explain how we research products, weight the scores and stay independent.
- Spotted an error in a spec? Tell us and we will correct the sheet.
Where to buy
Prices and availability may change. Check the retailer before buying. We may earn a commission on purchases.
What reviewers say
The bottom line
The Coway Airmega 400 is the clear winner, scoring 89 to 55 on our VS Score. It leads on Performance and Noise & power. The Coway Airmega 200M answers back with stronger Design. Pick the Coway Airmega 400 unless Design matters most to you — then the Coway Airmega 200M is the smarter buy.
