ha-client.app/beta-testing.md

The biggest contribution you can make to HA Client is to take part in testing and leave your feedback or report bugs in a form of issue on github.

Bug tracker: https://github.com/estevez-dev/ha_client/issues

Contact or discussion: HA Client on Discord or HA Client on Home Assistant community

To join beta testing you need to opt-in on Google Play. You can use this url to opt-out as well to get only stable versions.