Head-to-head · Best Air Purifiers

Coway Airmega 400S vs Levoit Core 400S

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

Verdict is reader-supported. As an Amazon Associate we earn from qualifying purchases. Some links on this page are affiliate links — if you click through and buy, we may earn a small commission at no extra cost to you. Our ratings are sourced from independent publications, not sponsors.

The short answer

Coway Airmega 400S comes out ahead by a narrow margin (4.5 vs 4.2). The gap is mostly about Owners of large open-concept living areas — read the strengths below before deciding.

Higher ratedRanked #1 in Best Air Purifiers

Coway Airmega 400S

4.5

3 sources$749as of Aug 1

Large spaces are the Coway Airmega 400S's job, and it cleans up to 3,120 sq. ft. quickly while staying quiet in sleep mode. Air cleaning performance is the strength, and the smart controls are genuinely convenient. The drawbacks worth weighing before buying: high operating costs and a large physical footprint.

Strengths

— Covers spaces up to 3,120 sq. ft. with high efficiency
— Removes 100% of particulates in 45 minutes during testing
— Operates at whisper-quiet 22 dB in sleep mode

Watch-outs

— High operating cost due to expensive replacement filters
— Bulky dimensions (14.8" x 22.8" x 14.8") occupy significant floor space
— Requires a mobile app to access certain smart features

$749 · Buy at cowaymega.com Full review →

Ranked #3 in Best Air Purifiers

Levoit Core 400S

4.2

5 sources$220as of Aug 1

Against previous models, the Levoit Core 400S removes particles more effectively, adds smart app integration, and does it in a quiet cylindrical body that saves space. It has no official HEPA certification, and tested noise and power figures differ slightly from the claimed numbers. In rooms up to 450 sq ft, performance is strong for a mid-range buyer.

Strengths

— Auto mode detected incense smoke and reacted in under 8 minutes
— VeSync app allows remote control and adjustment during pollen spikes
— Cylindrical 360-degree intake design pulls air from all sides effectively

Watch-outs

— Lacks official HEPA certification despite matching medical-grade performance in tests
— Actual noise level on low speed measured at 26 dB rather than the claimed 24 dB
— Energy consumption tested at 48W, slightly higher than the 45W specification

$220 · Buy at levoit.com Full review →

How they stack up

Coway Airmega 400S

The Coway Airmega 400S dominates in raw coverage power, cleaning spaces up to 3,120 sq. ft., which far exceeds the 540 sq. ft. limit of the Blueair Blue Pure 211+ and the 99 sq. ft. limit of the Dyson TP07. While it shares smart features with the Levoit Core 400S, the Coway is physically much bulkier and incurs higher long-term filter costs than the Levoit.

Levoit Core 400S

The Levoit Core 400S offers a compact, 360-degree intake design that is more space-efficient than the bulky Coway Airmega 400S or Blueair Blue Pure 211+. While it matches the Coway in smart app integration, it lacks the official HEPA certification that the Dyson TP07 and Coway possess, and it does not offer the cooling function unique to the Dyson.

Specs side-by-side

Spec	Coway Airmega 400S	Levoit Core 400S
CADR	328 cfm	244 CFM
Room Coverage	3,120 sq. ft.	400 sq ft (tested up to 450 sq ft)
Noise Level	22 dB	24–26 dB
Filtration System	HyperCaptive (Pre-filter, Carbon, HEPA)	Pre-filter, Main Filter, Activated Carbon
Dimensions	14.8 x 22.8 x 14.8 inches	—
Weight	24.7 lbs	10.5 lbs
Power Consumption	66 W	45–48 W
Filter Lifespan	Up to 12 months	6–8 months

← See the full ranking of best air purifiers