I think your friend expected a Honeywell, which has Bluetooth Enabled console. Literally, that you can turn on/off, and select modes within your house. It's convenient so you can control from meters away while watching TV/doing whatever you like. However, except for babies, and people with asthma, I think people don't really bother with this kind of apps.
There is also another trend of one touch - single button for air purifier, which focus solely on improving indoor air quality function. The Clair air purifier, as I check, indeed has extremely low power consumption, avg 4W/hour, which costs you up to $2 per month even if you don't mind to turn it off.