Status of Airwyn App?

Hi! I am a grad student who has been helping set up PurpleAir sensors in my area for about a year now.
Is the Airwyn app still up and running in the United States? I see the forum posts from 2022 referencing it as available on the App and Google Play Stores, yet when I go to download it today it has disappeared. Does anyone have an update on this app of when it might be available for download again?

Many thanks!