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Head-to-head · Best Air Purifiers

Blueair Blue Pure 311i Max 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.

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The short answer

Levoit Core 400S comes out ahead by a narrow margin (4.3 vs 4.1). Levoit Core 400S is best for: Tech-savvy buyers seeking a compact smart purifier for mid-sized rooms. Read the strengths below before deciding.

Blueair Blue Pure 311i Max
Ranked #4 in Best Air Purifiers
Blueair Blue Pure 311i Max
2 sources$169.99as of Oct 16

TechGearLab's best overall air purifier (80/100) and a 3.5/5 'Good' from PCMag: a light, quiet, app- and voice-controlled purifier for medium to large rooms that cleared smoke quickly in both outlets' tests. Its HEPASilent system relies on an always-on ionizer, and PCMag notes limited air quality readings and filter options.

Strengths
  • — Removed over 80% of particles in 10 minutes and had TechGearLab's 200 sq ft lab 99% clean by 27 minutes
  • — Cleared a 110 sq ft office from a PM2.5 reading of 200 to 0 in 14 minutes in PCMag's incense test
  • — Quiet: PCMag measured 52dB on high and 33dB on low
Watch-outs
  • — The HEPASilent system uses an always-on ionizer and is not a True HEPA filter, per TechGearLab
  • — TechGearLab found the child lock is not fully childproof
  • — PCMag notes limited air quality readings (PM2.5 only, no on-device numbers) and no application-specific filter options
$169.99 · Check Price on AmazonFull review →
Levoit Core 400S
Higher ratedRanked #3 in Best Air Purifiers
Levoit Core 400S
2 sources$220as of Oct 10

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.comFull review →

How they stack up

Blueair Blue Pure 311i Max

PCMag points out that two 311i Max units cost about the price of one Dyson Purifier Cool TP07, which adds an oscillating fan and more detailed air quality readings. TechGearLab suggests the Levoit Core 400S (the 400S-P version it tested) as the ionizer-free, family-friendly alternative that is nearly as powerful.

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

SpecBlueair Blue Pure 311i MaxLevoit Core 400S
Listed CADRPollen 365 cfm, Dust 314 cfm, Smoke 283 cfm (TechGearLab)—
Rated Room SizeUp to 929 sq ft in 30 minutes (PCMag)—
FiltrationHEPASilent: pleated particle filter plus ionizer, carbon layer, washable fabric pre-filter—
Measured Weight7.3 lbs (TechGearLab)—
Dimensions19 x 12.5 x 12.5 in—
Smart FeaturesWi-Fi app, Amazon Alexa, Google Assistant—
Replacement Filter$44.99, up to nine months (PCMag)—
Energy StarYes—
CADR—244 CFM
Room Coverage—400 sq ft (tested up to 450 sq ft)
Noise Level—24–26 dB
Filtration System—Pre-filter, Main Filter, Activated Carbon
Weight—10.5 lbs
Power Consumption—45–48 W
Filter Lifespan—6–8 months
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