I have a Rachio 3 with flow meter.
It would be nice for the App to calculate an estimate of my water bill.
With the flow sensor you know how much water is being used, all you need to know is my water charge and then a simple calculation, with a estimated charge per zone, per complete run cycle, Per month ect
Also It would be nice to set a budget for watering and the system use that when calculating water watering days.
I know your flow meter is not as accurate as the city’s water meter and there will be some error built in.
But if you want to show you want to conserve water, there is not better way than to show how much watering is costing someone on there monthly watering bill
Just some ideas that would again separate you from others out there