Though it does vaguely look like benevolent artificial intelligence HAL 9000 from 2001, Coway’s Mighty air purifier is to be trusted.

Air purifiers are placed in homes to reduce allergens and harmful airborne particulates — reducing allergy, respiratory and general air quality issues. They do this through a combination of air flow — a fan, basically — and usually a series of filters.

In its review of the best air purifiers you can buy, Wirecutter wrote, “Simply put, it’s one of the highest-performing air purifiers we’ve tested. And it’s easily the most affordable. It not only outperforms purifiers that cost two and even three times as much upfront, but also costs far less to run and maintain for five years than any other purifier we’ve tested.”

The Mighty is quiet, effective and today only, under $200. Usually available for $220, today it’s $189.

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