The best smart HEPA air purifier tells you what its filter captures and at what particle size. We compared five app-controlled models on listed capture rates, filter stages, pre-filters and carbon.
See also our best smart air purifier and best HEPA smart air purifier guides. Every pick comes from the makers’ specifications on each Amazon listing, not our own testing, and our Editorial Policy explains how we work. Replace filters on the schedule each maker lists and keep the air intake clear.
Our Top 3 Picks for the Best Smart HEPA Air Purifier
Levoit Core 200S smart air purifier with 3-in-1 filter and HEPA Sleep Mode
- Main filter listed to remove 99.97% of dust, pollen and dander 0.1 to 0.3 microns in size
- Nylon pre-filter and activated carbon filter sit ahead of the main filter
- App feature tracks filter life, and Alexa handles voice control
Levoit EverestAir smart air purifier with washable pre-filter
- Lists a CADR of 354 CFM and 2,655 sq ft in one hour
- 3-stage original filter with a washable pre-filter
- Levoit lists 60% more carbon than its Vital 200S-P for tough odors
Coway Airmega 400S smart air purifier with HyperCaptive HEPA filtration
- HyperCaptive system pairs a pre-filter, active carbon filter and HEPA filter
- Listed to reduce 99.97% of 0.3 micron particles plus VOCs and odor
- Eco Mode turns the fan off after 30 minutes of purified air
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Smart HEPA Air Purifier Filters Compared
| # | Product | Key Features | |
|---|---|---|---|
| 1 |  Levoit Core 200S smart air purifier with 3-in-1 filter and HEPA Sleep Mode |
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| 2 |  Levoit EverestAir smart air purifier with washable pre-filter |
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| 3 |  Coway Airmega 400S smart air purifier with HyperCaptive HEPA filtration |
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| 4 |  Blueair Signature SP4i smart air purifier with 7-stage HEPASilent filtration |
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| 5 |  Levoit Vital 100S smart air purifier with washable pre-filter and Pet Mode |
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1. Levoit Core 200S smart air purifier with 3-in-1 filter and HEPA Sleep Mode
Best Overall
- Main filter listed to remove 99.97% of dust, pollen and dander 0.1 to 0.3 microns in size
- Nylon pre-filter and activated carbon filter sit ahead of the main filter
- App feature tracks filter life, and Alexa handles voice control
- Display Off button turns off all lights
- Lists 27 dB, above Coway Airmega 400S at 22, Levoit EverestAir at 24 and Levoit Vital 100S at 25
- Refreshes a 140 sq ft room 4.8 times per hour, below Levoit Vital 100S at 222 sq ft
- Carbon Filter: High-efficiency activated carbon
- Low Noise: 27 dB
- Size: 8.1 x 8.1 x 12.6 in
Levoit builds the Core 200S-P around a 3-in-1 filter with a nylon pre-filter, activated carbon and a main filter. The main filter is listed to remove 99.97% of particles 0.1 to 0.3 microns in size.
A 360 degree air intake feeds the filter, and Levoit says to use genuine replacement filters for the longest lifespan. The unit weighs 6.6 pounds and measures 8.1 by 8.1 by 12.6 inches.
Right buyer for the Levoit Core 200S
It suits a bedroom, dorm or office where you want a 0.1 to 0.3 micron capture range in 6.6 pounds.
Wrong buyer for the Levoit Core 200S
Skip it if a lower noise floor matters, since Coway Airmega 400S lists 22 dB.
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2. Levoit EverestAir smart air purifier with washable pre-filter
Best Listed CADR
- Lists a CADR of 354 CFM and 2,655 sq ft in one hour
- 3-stage original filter with a washable pre-filter
- Levoit lists 60% more carbon than its Vital 200S-P for tough odors
- 3-channel laser sensor scans PM10, PM2.5 and PM1.0
- Lists only Alexa for voice, while Levoit Vital 100S also lists Google Assistant
- Carbon Filter: 60% more carbon than Vital 200S-P
- CADR: 354 CFM
- Low Noise: 24 dB
Levoit lists a CADR of 354 CFM for the EverestAir-P, covering up to 2,655 sq ft in one hour. Its 3-stage original filter pairs a washable pre-filter with a larger carbon load.
The listing gives a particle retention size of 0.1 micron and noise as low as 24 dB. Smart scenes in the app can switch the unit on when air quality drops.
Right buyer for the Levoit EverestAir
It suits a large living room with pet and cooking odors where you want a listed CADR in CFM.
Wrong buyer for the Levoit EverestAir
Skip it if you want more filter stages, since Blueair SP4i lists a 7-stage HEPASilent system.
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3. Coway Airmega 400S smart air purifier with HyperCaptive HEPA filtration
Best Fan-Off Eco Mode
- HyperCaptive system pairs a pre-filter, active carbon filter and HEPA filter
- Listed to reduce 99.97% of 0.3 micron particles plus VOCs and odor
- Eco Mode turns the fan off after 30 minutes of purified air
- IoCare app sends filter notifications and shows outdoor air quality
- Lists 3 filter stages, fewer than the 7 on Blueair SP4i
- Carbon Filter: Active carbon
- Coverage: 3,120 sq ft in 60 min
- Low Noise: 22 dB
Coway names its filter set the HyperCaptive Filtration System. The pre-filter, active carbon filter and HEPA filter together are listed to reduce 99.97% of 0.3 micron particles.
Coway lists coverage of 3,120 sq ft in 60 minutes and noise as low as 22 dB. Smart Mode adjusts fan speed to the room’s air quality, and the unit works with Alexa.
Right buyer for the Coway Airmega 400S
It suits a large home where you want app filter alerts and a fan that rests once the air stays clean.
Wrong buyer for the Coway Airmega 400S
Skip it if you want the most filter stages, since Blueair SP4i lists 7.
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4. Blueair Signature SP4i smart air purifier with 7-stage HEPASilent filtration
Most Filter Stages
- 7-stage HEPASilent filtration system
- Listed to capture 99.97% of airborne particles down to 0.1 microns
- Interchangeable pre-filters come in a variety of colors
- Lists 3,385 sq ft of coverage every hour
- Lists Alexa as its only voice assistant, while Levoit Vital 100S also lists Google Assistant
- Carbon Filter: Activated carbon
- Coverage: 3,385 sq ft per hour
- Fast Clean: 705 sq ft in 12.5 min
Blueair lists a 7-stage HEPASilent system that captures 99.97% of airborne particles down to 0.1 microns. OdorFence Technology is listed to help break down odors, gases and VOCs.
The listing gives 705 sq ft in 12.5 minutes and 3,385 sq ft every hour. The Blueair app controls fan speed and schedules, and Auto Mode adjusts purification.
Right buyer for the Blueair SP4i
It suits open floor plans where you want the most filter stages in this group.
Wrong buyer for the Blueair SP4i
Skip it if you use Google Assistant, since Levoit Vital 100S lists both Alexa and Google Assistant.
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5. Levoit Vital 100S smart air purifier with washable pre-filter and Pet Mode
Most Replacement Filter Options
- Listed at 99.97% filtration efficiency for particles 0.1 to 0.3 microns
- Washable pre-filter rinses clean with water
- Optional Toxin Absorber, Smoke Remover and pet replacement filters
- Works with Amazon Alexa and Google Assistant
- Lists 1,073 sq ft per hour, below Blueair SP4i at 3,385, Coway Airmega 400S at 3,120 and Levoit EverestAir at 2,655
- Levoit warns that off-brand filters may damage this purifier
- Carbon Filter: Activated carbon
- Coverage: 1,073 sq ft per hour
- Low Noise: 25 dB
Levoit lists HEPA-grade filtration during Sleep Mode, which lowers the fan to 25 dB. A light sensor also dims the display in dark rooms.
The activated carbon filter is listed to help remove pet odors, fumes and VOCs. Levoit gives 4.8 air changes per hour in rooms up to 222 sq ft.
Right buyer for the Levoit Vital 100S
It suits pet owners who may want to swap in a Smoke Remover or Toxin Absorber filter later.
Wrong buyer for the Levoit Vital 100S
Skip it for open floor plans, since Blueair SP4i lists 3,385 sq ft every hour.
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How to Choose the Best Smart HEPA Air Purifier
- Read the capture claim with its particle size. Levoit Core 200S and Levoit Vital 100S list 99.97% at 0.1 to 0.3 microns. Blueair SP4i lists 99.97% down to 0.1 microns.
- Count the filter stages. Blueair SP4i lists 7, while Levoit Core 200S, Levoit EverestAir, Coway Airmega 400S and Levoit Vital 100S each use 3.
- Check the pre-filter. Levoit EverestAir and Levoit Vital 100S list washable pre-filters, and Levoit Core 200S uses a nylon pre-filter.
- Look at the carbon layer for odors. Levoit EverestAir lists 60% more carbon than the Vital 200S-P, and Coway Airmega 400S pairs active carbon with HEPA.
- Plan for replacements. Levoit Vital 100S offers Toxin Absorber, Smoke Remover and pet filters, and Levoit warns against off-brand filters.
Frequently Asked Questions
Which smart HEPA air purifier lists the smallest particle size?
Blueair SP4i and Levoit EverestAir list 0.1 micron. Levoit Core 200S and Levoit Vital 100S list 99.97% capture across 0.1 to 0.3 microns.
Which pick has the most filter stages?
Blueair SP4i lists a 7-stage HEPASilent system. The other four picks each list 3 stages.
Which picks have a washable pre-filter?
Levoit EverestAir and Levoit Vital 100S list washable pre-filters. Levoit says rinsing the Vital 100S pre-filter with water helps maintain its 3-stage system.
Which pick lists a CADR in CFM?
Levoit EverestAir lists a CADR of 354 CFM. Levoit pairs that figure with coverage of 2,655 sq ft in one hour.
Final Verdict
Our best smart HEPA air purifier pick is the Levoit Core 200S for its 0.1 to 0.3 micron capture at 6.6 pounds. Choose Levoit EverestAir for a 354 CFM CADR and Coway Airmega 400S for HEPA with Eco Mode.
Best Overall: Levoit Core 200S smart air purifier with 3-in-1 filter and HEPA Sleep Mode Check Latest Price
Best Listed CADR: Levoit EverestAir smart air purifier with washable pre-filter Check Latest Price
Best Fan-Off Eco Mode: Coway Airmega 400S smart air purifier with HyperCaptive HEPA filtration Check Latest Price
Check each listing for current filter part numbers before you order replacements.
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