Everyone recommends pushover but it costs money. I recommend Pushbullet as it's free and I've had zero issues with how quickly it responds or how reliable it is. I use it to let my wife and I know when HSM is armed or disarmed and also when there's a knock on the front door.
It's easy to configure as well. In terms of a dashboard...yes it can be shared but if you plan to use Alexa or Google Assistant any at all you can use those as your dashboards with more ease.
