Alen
Alen BreatheSmart 75i Large Room Air Purifier
Air purifiers
$749List price
Explore this product Your shortlist, side by side
Alen BreatheSmart 75i Large Room Air Purifier vs Coway Airmega 400
Find the differences that matter for your next decision.
Coway
Coway Airmega 400
Air purifiers
$549List price
Explore this product What matters most to you?
Start with all rankable specifications, or focus on a particular use.
Your starting point
Buy the Coway Airmega 400.
- Leads 3 of 4 rankable overall specs; Alen BreatheSmart 75i Large Room Air Purifier takes 1.
- Coverage area: 1,560 sq ft vs 1,400 sq ft
How we reached this
We compare the published specifications relevant to your priority. Each rankable specification counts once; your selected requirements can rule a product out. This is a guide to the numbers, not a laboratory performance score.
Noise levels: 22 dB vs 25 dB
It is also $200 cheaper.
The trade-off to know
Check first: the Coway Airmega 400 has no Wi-Fi app. Tick them under deal-breakers if that rules it out.
Look at the differences ↓Refine your requirements
What would rule one out?
Side by side
The differences, in detail.
Start with the key specs, then explore as much as you need.
| What you’re comparing | Alen BreatheSmart 75i Large Room Air Purifier | Coway Airmega 400 |
|---|---|---|
| CADRPerformance | 350 CFM across Smoke, Dust, Pollen | 350 CFM (Smoke), 328 CFM (Dust), 400 CFM (Pollen) |
| Room sizePerformance | Large master suites, open living rooms, offices | Large living rooms, open floor plans, offices |
| Coverage areaPerformance | 1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) | 1,560 sq ft (2 air changes/hr) / 780 sq ft (4 air changes/hr) |
| Filter typesFilters | Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon | Washable Pre-filter + Max2 Filter (True HEPA + Activated Carbon) |
| Filter lifeFilters | 12–15 months extra long filter life | 12 months (Max2 filter) / Washable pre-filters |
Showing 5 of 11 specifications. Missing values stay unlisted. About the sources
Both sides of the decision
What you gain. What you give up.
Alen BreatheSmart 75i Large Room Air Purifier
Reasons to choose it
- Industry-exclusive transferable Lifetime Warranty
- Tuned pink noise frequencies promote deeper sleep on WhisperMax mode
- Medical-grade H13 True HEPA filter lasts up to 15 months
Worth considering
- High initial investment
- Tall tower profile
Coway Airmega 400
Reasons to choose it
- 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
Worth considering
- Cube design has a large floor footprint
- No mobile app connectivity on the non-S model
Beyond the spec sheet
Living with your choice.
Explore the ownership details available for this pair.
What three years could cost
Alen BreatheSmart 75i Large Room Air Purifier
3-Year Estimated Total$1,046
Coway Airmega 400
3-Year Estimated Total$819
Everyday ownership notes
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Alen: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Coway: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Know what’s behind the comparison
Published specs. Visible sources.
Clinchmark compares manufacturer specifications and other published information. We have not independently lab-tested these products. Editorial assessments and unknown values are identified in the specification details.
Catalog snapshot: September 1, 2026. Prices, availability, and provider terms can change.
Still weighing it up?
Which is cheaper, the Alen BreatheSmart 75i Large Room Air Purifier or the Coway Airmega 400?
Coway Airmega 400 costs $200 less at list price.
What is the biggest catch with the Alen BreatheSmart 75i Large Room Air Purifier or Coway Airmega 400?
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 Alen BreatheSmart 75i Large Room Air Purifier or the Coway Airmega 400?
For bedrooms, buy the Coway Airmega 400. Leads 2 of 2 rankable bedrooms specs. Noise levels: 22 dB vs 25 dB
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.