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Head to head

Levoit Core 400S vs Blueair Blue Pure 311i Max

They split the 4 rankable specs evenly, so cost decides it: Levoit Core 400S costs $10 less.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Levoit Core 400S lists 260 CFM / 442 m³/h (Smoke), 260 CFM (Dust), 260 CFM (Pollen) (Levoit sheet, 2026-09-02); Blueair Blue Pure 311i Max lists 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) (Blueair sheet, 2026-09-02).
  • Coverage area: Levoit Core 400S lists 403 sq ft (5 air changes/hr) / 990 sq ft (2 air changes/hr) (Levoit sheet, 2026-09-02); Blueair Blue Pure 311i Max lists 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) (Blueair sheet, 2026-09-02).
  • Room size: Levoit Core 400S lists Bedrooms, apartments, mid-size living spaces (Levoit sheet, 2026-09-02); Blueair Blue Pure 311i Max lists Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) (Blueair sheet, 2026-09-02).
  • Filter types: Levoit Core 400S lists 3-Stage: Nylon Pre-filter + H13 True HEPA + High-Efficiency Activated Carbon (Levoit sheet, 2026-09-02); Blueair Blue Pure 311i Max lists HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter (Blueair sheet, 2026-09-02).
  • Filter life: Levoit Core 400S lists 6–12 months (Levoit sheet, 2026-09-02); Blueair Blue Pure 311i Max lists 6 to 9 months (tracked by RealTrack algorithm in app) (Blueair sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Levoit Core 400S
$2192 spec wins
Swap

Compare a different air purifier

Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Coway Airmega AP-1512HH Mighty$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 250$399Coway Airmega 400$549Blueair Protect 7470i$649Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799
Blueair Blue Pure 311i Max
$2292 spec wins
Swap

Compare a different air purifier

Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Coway Airmega AP-1512HH Mighty$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 250$399Coway Airmega 400$549Blueair Protect 7470i$649Alen BreatheSmart 75i Large Room Air Purifier$749Dyson Purifier Hot+Cool Formaldehyde HP09$799

Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 2 to 2

Tied overall. Levoit Core 400S is cheaper.

  • The 4 rankable overall specs split 2 to 2.
  • Saves $10 at list price.
2 Levoit Core 400S4 rankable of 11 specsBlueair Blue Pure 311i Max 2

Deal-breakers

tick what would make you walk away

  • row

    Undersized for an open-plan living area.

    Trips:Levoit Core 400S · 403 sq ftTrips:Blueair Blue Pure 311i Max · 387 sq ft

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Levoit

260 CFM / 442 m³/h (Smoke), 260 CFM (Dust), 260 CFM (Pollen)

Blueair

250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen)

Coverage area

Levoit

403 sq ft (5 air changes/hr) / 990 sq ft (2 air changes/hr)

Blueair

387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr)

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons
⚠️ Cost Reversal Alert: While the Levoit is cheaper upfront, the Blueair saves $20 over 3 years due to lower consumable & maintenance costs.

Levoit Core 400S

Upfront list price$219
3-Yr H13 True HEPA filter (Every 12 months (~$45/yr))+$135
3-Year Estimated Total$354

Blueair Blue Pure 311i Max

Upfront list price$229
3-Yr SmokeBlock combo filter (Every 6–9 months (~$35/yr))+$105
3-Year Estimated Total$334

Room Placement & Bedroom Noise Check

Physical clearance required for airflow, wall placement, and bedroom noise levels.

Ergonomic & Spatial Check

Wall Clearance Required

Cylindrical 360° filters cannot sit flush against walls without choking intake.

Levoit

360° intake requires 15 in perimeter clearance from walls

Blueair

360° fabric pre-filter intake (needs 12 in wall space)

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Levoit

24 dB quiet sleep mode

Blueair

23 dB lowest speed setting

Unit Footprint & Dimensions

Levoit

Mid-sized cylinder (10.8 × 10.8 × 20.5 in; 11.0 lb)

Blueair

Cylindrical aesthetic (12.4 × 12.4 × 18.9 in; 7.8 lb)

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Levoit: What to watch for

  • Maintenance

    Requires periodic filter replacements to maintain airflow and odor capture.

    Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Blueair: What to watch for

  • Maintenance

    Outer fabric pre-filter attracts visible pet fur and lint.

    The decorative fabric outer sleeve functions as the coarse pre-filter, requiring weekly vacuuming to avoid looking dusty in living rooms.

Levoit Core 400S$2192 wins
Blueair Blue Pure 311i Max$2292 wins

Performance

leads 2-0
Performance specifications. Middle column is Levoit Core 400S, right column is Blueair Blue Pure 311i Max.
CADR260 CFM / 442 m³/h (Smoke), 260 CFM (Dust), 260 CFM (Pollen) (wins this row: higher)250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen)
Room sizeBedrooms, apartments, mid-size living spacesMedium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH)
Coverage area403 sq ft (5 air changes/hr) / 990 sq ft (2 air changes/hr) (wins this row: higher)387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr)

Filters

2 differences
Filters specifications. Middle column is Levoit Core 400S, right column is Blueair Blue Pure 311i Max.
Filter types3-Stage: Nylon Pre-filter + H13 True HEPA + High-Efficiency Activated CarbonHEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter
Filter life6–12 months6 to 9 months (tracked by RealTrack algorithm in app)

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Levoit Core 400S, right column is Blueair Blue Pure 311i Max.
Noise levels24 dB (Sleep mode) – 52 dB (High mode)23 dB (Night mode) – 50 dB (Max boost) (wins this row: lower)
Energy consumption38 W max power consumption38 W max power consumption (Energy Star Most Efficient)
Smart featuresVeSync Wi-Fi App, Amazon Alexa, Google Assistant voice controlBlueair App (iOS/Android), voice control with Amazon Alexa and Google Assistant, geofencing Welcome Home feature
Air quality sensorsAirSight Plus Laser Dust Sensor with PM2.5 numerical display and 4-color ringLaser particle sensor with 5-color LED air quality indicator ring (PM1, PM2.5, PM10)

Design & Ownership

leads 1-0
Design & Ownership specifications. Middle column is Levoit Core 400S, right column is Blueair Blue Pure 311i Max.
Weight14.1 lb (6.4 kg)7.8 lb (3.5 kg) (wins this row: lower)
Warranty2 years limited warranty2 years limited warranty (extendable to 3 years with product registration)
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Levoit Core 400S source (opens in a new tab)Blueair Blue Pure 311i Max source (opens in a new tab)

Which one should you buy

Pick this one if

Levoit Core 400S

Smart air purifier with H13 True HEPA filtration, AirSight Plus laser dust sensor, and VeSync app control.

  • Whisper-quiet 24 dB sleep mode with completely dimmable light display
  • AirSight Plus laser sensor provides real-time PM2.5 numerical readings
  • VeSync smartphone app with scheduling, filter life tracking, and voice control

What you give up

  • Coverage is sized for medium bedrooms and living rooms (under 1,000 sq ft)
  • Activated carbon layer is a coated sheet rather than heavy pellet bed
Full Levoit Core 400S specs →

Pick this one if

Blueair Blue Pure 311i Max

Smart air purifier with HEPASilent dual filtration technology, cleaning up to 929 sq ft in 30 minutes, 23dB whisper quiet operation, and Blueair app control.

  • HEPASilent dual filtration combines electrostatic and mechanical filtration for faster airflow at lower noise
  • Cleans up to 387 sq ft in 12.5 minutes (4.8 ACH) / up to 929 sq ft in 30 minutes (2 ACH)
  • Ultra-quiet 23dB Night Mode with Energy Star certified low electricity draw

What you give up

  • Fabric pre-filter covers the exterior and requires periodic vacuuming/washing
  • Filter replacements needed every 6 to 9 months
Full Blueair Blue Pure 311i Max specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

For bedrooms, buy the Blueair Blue Pure 311i Max.

  • Leads 2 of 2 rankable bedrooms specs.
  • Noise levels: 23 dB vs 24 dB
  • Weight: 7.8 lb vs 14.1 lb
  • Levoit Core 400S is $10 cheaper. Pay the difference only if noise levels matters to you.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

For big rooms & allergies, buy the Levoit Core 400S.

  • Leads 2 of 2 rankable big rooms & allergies specs.
  • CADR: 260 CFM / 442 m³/h vs 250 CFM
  • Coverage area: 403 sq ft vs 387 sq ft
  • It is also $10 cheaper.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets.

  • Filter life: 6–12 months vs 6 to 9 months
  • Energy consumption: 38 W max power consumption vs 38 W max power consumption

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Levoit Core 400S spec sheetBlueair Blue Pure 311i Max spec sheet

Manufacturer pages: Levoit Core 400S ↗ · Blueair Blue Pure 311i Max ↗

Common questions

Which is cheaper, the Levoit Core 400S or the Blueair Blue Pure 311i Max?

Levoit Core 400S costs $10 less at list price.

What is the biggest catch with the Levoit Core 400S or Blueair Blue Pure 311i Max?

Both has this deal-breaker: under 1,000 sq ft coverage. Undersized for an open-plan living area.

Which is better for bedrooms, the Levoit Core 400S or the Blueair Blue Pure 311i Max?

For bedrooms, buy the Blueair Blue Pure 311i Max. Leads 2 of 2 rankable bedrooms specs. Noise levels: 23 dB vs 24 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.

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