Head to head
Coway Airmega 400 vs Levoit Core 300S Smart True HEPA Air Purifier
Coway Airmega 400 leads 3 to 1 on the 4 rankable specs, but Levoit Core 300S Smart True HEPA Air Purifier costs $400 less. Most of the 11 attributes tracked here are descriptive rather than numeric.
Catalog as of September 1, 2026
Why, in numbers
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Compare a different air purifier
Winix 5500-2 Air Purifier$159Levoit Core 400S$219Coway Airmega AP-1512HH Mighty$229Blueair Blue Pure 311i Max$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 250$399Blueair Protect 7470i$649Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799Buying for
Straight answer
Overall: 3 to 1
Buy the Coway Airmega 400.
- Leads 3 of 4 rankable overall specs; Levoit Core 300S Smart True HEPA Air Purifier takes 1.
- CADR: 350 CFM vs 141 CFM / 240 m³/h
- Coverage area: 1,560 sq ft vs 219 sq ft
- Levoit Core 300S Smart True HEPA Air Purifier is $400 cheaper. Pay the difference only if cadr matters to you.
At a glance
The handful of numbers that decide most purchases in this category.
CADR
Coway
350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen)
Levoit
141 CFM / 240 m³/h (Smoke), 140 CFM (Dust), 145 CFM (Pollen)
Coverage area
Coway
1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr)
Levoit
219 sq ft (5 air changes/hr) / 1,095 sq ft (1 air change/hr)
True 3-Year Cost of Ownership (TCO)
Coway Airmega 400
Levoit Core 300S Smart True HEPA Air Purifier
Room Placement & Bedroom Noise Check
Physical clearance required for airflow, wall placement, and bedroom noise levels.
Wall Clearance Required
Requires 12 in perimeter airflow space
360° intake requires 15 in perimeter clearance from walls
Nighttime Sleep Mode Noise
Standard sleep speed
22 dB whisper mode (practically inaudible on nightstand)
Unit Footprint & Dimensions
Standard room purifier footprint
Compact cylinder (8.7 × 8.7 × 14.2 in; 5.9 lb)
The 90-Day Owner Regret Check
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Coway: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Levoit: What to watch for
- Hardware Quirk
No true HEPA H13 rating on recent replacement filters.
- Maintenance
Filter check light does not measure real dirt; it operates on a fixed timer.
Performance
leads 2-0| CADR | 350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) (wins this row: higher) | 141 CFM / 240 m³/h (Smoke), 140 CFM (Dust), 145 CFM (Pollen) |
|---|---|---|
| Room size | Large living rooms, open floor plans, offices | Bedrooms, nurseries, home offices up to 219 sq ft (5 ACH) / up to 1,095 sq ft (1 ACH) |
| Coverage area | 1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) (wins this row: higher) | 219 sq ft (5 air changes/hr) / 1,095 sq ft (1 air change/hr) |
Filters
2 differences| Filter types | Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon) | 3-Stage filtration: Pre-filter + H13 True HEPA + High-Efficiency Activated Carbon filter |
|---|---|---|
| Filter life | 12 months (Max2 filter) / Washable pre-filters | 6 to 8 months |
Usability & Smart
4 differences| Noise levels | 22 dB (Sleep mode) – 52 dB (Max speed) | 22 dB (Sleep mode) – 48 dB (High speed) |
|---|---|---|
| Energy consumption | 66 W max power consumption (Energy Star Certified) | 23 W max power (Energy Star Certified) |
| Smart features | Smart Auto Mode + Eco Mode (no Wi-Fi app) | VeSync App (iOS/Android), voice control via Amazon Alexa and Google Assistant |
| Air quality sensors | Real-time particle sensor with colorful LED ring indicator | AirSight Plus Laser Dust Sensor (real-time PM2.5 with 4-color air quality ring) |
Design & Ownership
2 differences| Weight | 24.7 lb (11.2 kg) | 5.95 lb (2.7 kg) (wins this row: lower) |
|---|---|---|
| Warranty | 5 years limited motor / 1 year electronic parts (wins this row: higher) | 2 years limited warranty (with registration) |
Which one should you buy
Pick this one if
Coway Airmega 400
Dual-suction large room air purifier with Max2 HEPA and activated carbon filtration covering 1,560 sq ft.
- Massive CADR cleans up to 1,560 sq ft twice per hour
- Dual-sided air intake with combined True HEPA and carbon filters
- Smart Eco mode turns off fan when air remains clean for 30 minutes
What you give up
- Cube design has a large floor footprint
- No mobile app connectivity on the non-S model
Pick this one if
Levoit Core 300S Smart True HEPA Air Purifier
Compact smart air purifier with 3-stage True HEPA H13 filtration, VortexAir technology, and VeSync app smart control.
- Whisper-quiet 22dB Sleep Mode
- Compact footprint ideal for bedrooms and home offices
- Full smart app control and Alexa/Google voice integration
What you give up
- Designed for smaller to medium rooms (up to 219 sq ft for 5 ACH)
- Laser dust sensor only measures PM2.5 (no VOC / gas sensor)
Best for each use
Bedrooms
Too close to call on bedrooms from the spec sheets. Only weight is rankable here.
Big rooms & allergies
For big rooms & allergies, buy the Coway Airmega 400.
Low running cost
Too close to call on low running cost from the spec sheets. Only warranty is rankable here.
Done deciding?
Open the full standalone spec sheet for either device.
Manufacturer pages: Coway Airmega 400 ↗ · Levoit Core 300S Smart True HEPA Air Purifier ↗
Common questions
Which is cheaper, the Coway Airmega 400 or the Levoit Core 300S Smart True HEPA Air Purifier?
Levoit Core 300S Smart True HEPA Air Purifier costs $400 less at list price.
What is the biggest catch with the Coway Airmega 400 or Levoit Core 300S Smart True HEPA Air Purifier?
Coway Airmega 400 has this deal-breaker: no Wi-Fi app. No schedules or remote control from your phone.
Which is better for bedrooms, the Coway Airmega 400 or the Levoit Core 300S Smart True HEPA Air Purifier?
Too close to call on bedrooms from the spec sheets. Only weight is rankable here. Noise levels: 22 dB vs 22 dB Smart features: Smart Auto Mode + Eco Mode vs VeSync App
What cannot be compared from spec sheets?
Of the 11 specs tracked here, 7 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.