App is completely counter-intuitive, impossible to edit room names (doesnt save edits after they are edited), etc., etc. Air quality on my unit always says 450 ppm VOCs, no matter if the unit is set inside a paint can, out on the deck, or in the middle of the smoke of a campfire. Dont waste your money buying the unit, and dont waste your frustration on this free app!
PJGlassey about Eve for Matter & HomeKit