Strong CADR per dollar with app and auto mode; very quiet on low.
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Best Air Purifiers for Allergies and Pollen

Quieter and more efficient than the 211+, with app control.

Large-room CADR from a light, efficient unit; short filter life raises running cost.

Very efficient CADR per watt; filters are rated for only six months.

Large-room Winix with heavy carbon and app; slightly costlier than the T810.
Efficient medium-room unit; superseded by the 311i Max.

Adds a washable prefilter and a pet-hair mode to the Core 400S formula.

Medium-room Blueair with very low power draw and app.

Levoit's flagship with a laser sensor and directional vent; expensive for the CADR.

Two-sided filtration with a real carbon layer; filters cost more than most.
The 5500-2 without the remote and with a lighter carbon filter.

High CADR at a quiet 52 dB maximum; annual filter cost is among the highest here.

Quiet at full speed and well built; price per CADR is high.

5500-class performance with app control.

Airmega 400 with Wi-Fi app control.

Twin-filter unit with very high claimed CADR; not AHAM listed.
A pellet-carbon filter you can wash, strong CADR, and a low street price; PlasmaWave can be switched off.
211+ with a particle sensor and auto mode.

The long-running benchmark: strong CADR for the price, a real auto mode and cheap annual filters.
High CADR, simple one-button operation, fabric prefilter; no auto mode and short filter life.
Winix's 360 sq ft platform in a taller cabinet with Wi-Fi.

Same internals as the Mighty in a square housing with a square filter.

Quiet for its CADR; the 930 sq ft claim is at 1 air change per hour, so treat it as a 370 sq ft unit for allergies.
HPA300 internals with a particle sensor, auto mode and app.
Proven large-room CADR at a fair price; loud and power-hungry at full speed, no auto mode.

Medium Alen with the same quiet motor; lifetime warranty with filter subscription.

Coway's bedroom unit with auto mode. CADR is derived from Coway's 222 sq ft claim at 5 air changes an hour; no AHAM listing was found.
45i without the sensor or app.
Medium CADR with auto mode at a low price; room-size claim is at 1 ACH.
Compact-plus unit with a particle sensor.