The cheap IKEA air purifier has another huge benefit: you can control it with a smart socket. So hook it up to a tasmota smart plug and you will have a smart purifier.
From this thread, the bigger IKEA one seems to have smarts built in.
It does and it works great, but it’s about twice as expensive. The cheaper one, on the other hand, has zero smart features, and the only dial on the top directly controls the speed of the fan, with nice mechanical steps. So you can preselect the speed and then cut power as needed with your smart outlet. That’s, unfortunately, not the norm anymore. My cheap dehumidifier has no smart features, but is sufficiently complicated with its programs and buttons that it resets after a power cut.