
Smallest Levoit with app control; no particle sensor.
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Smallest Levoit with app control; no particle sensor.
Strong CADR per dollar with app and auto mode; very quiet on low.

Very efficient CADR per watt; filters are rated for only six months.
Efficient medium-room unit; superseded by the 311i Max.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.
The 5500-2 without the remote and with a lighter carbon filter.

5500-class performance with app control.
A pellet-carbon filter you can wash, strong CADR, and a low street price; PlasmaWave can be switched off.

Tiny bedroom unit with auto mode and app; fine for a small room, not a living room.

The long-running benchmark: strong CADR for the price, a real auto mode and cheap annual filters.
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.

Core 300 plus a PM2.5 sensor, auto mode and app.

Compact with a washable prefilter and auto mode.
Proven large-room CADR at a fair price; loud and power-hungry at full speed, no auto mode.

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.

The best-selling compact purifier; no auto mode, thin carbon, but cheap and quiet on low.
Medium CADR with auto mode at a low price; room-size claim is at 1 ACH.
Compact-plus unit with a particle sensor.

High claimed CADR for the money; not AHAM listed, and filters are short-lived.

Compact unit with auto mode and a washable prefilter; filters are pricey for the CADR.

Budget medium-room unit; CADR is manufacturer-claimed.
Mid-size HPA; reliable but dated, with no sensor.

Tower with UV-C; low CADR and loud for its size, but cheap.
Small HPA for a bedroom; basic and loud for its CADR.