What tools do you use for spotting positive cashflow properties

[Michael Judkins]

Im getting into buy and hold with the primary goal of cashflow and long term appreciation. Does there exist an online tool which shows you a feed of properties in a given area ranked by potential cashflow? I know I can do this by hunting and pecking on Zillow and looking at the mortage payment estimate vs the Rental "Zestimate", but it's time consuming and doesn't surface opportunities at a high level. Ideally Im looking for a tool which would automatically send new investment opportunities that have positive cash flows, good forecasted appreciation rates, etc and based on my parameters.