They have a github if you want to use it with your own graphana without requiring any cloud access: https://github.com/Airthings

I've got one per floor in a 3 floor house and all get to the BT -> wifi gateway reliably.

Seconded. Nice app that has good historical views and easy export of all data.

+1 Airthings as long as you don't need any customer support.

Been running the wave plus for 2 years and can recommend