Coway Airmega 400 vs Levoit EverestAir-P

The Levoit EverestAir-P is better overall than the Coway Airmega 400. Their maximum particle filtration performance is very similar, with the Coway having a slightly higher maximum CADR, but the Levoit holds onto substantially stronger filtration when you need to keep noise down. It also has app support, more detailed PM1.0, PM2.5, and PM10 readings, and a much shallower body that makes it easier to place against a wall. The Coway has the advantage of a HEPA certified filter and is slightly quieter at its lowest setting, but it lacks app controls and has much weaker low noise filtration performance.