> I wouldn't pay for Rentometer. They will let you look up a few properties for free. This will give you an okay baseline of what others are charging, but does not give you any context regarding the amenities or renovations.
> Instead, you should try the Bigger Pockets has options under "Tools", "Calculators", then "Rent Estimator".
I don't think that BiggerPocket's rent estimator tool is any different from Rentometer, as they both use comparable and they both don't look inside of the property, they both don't know if the property has granite countertops or cheap plastic.
Whichever tool you use, I would start with that, to pick comparables, and then click through photos for each comp and confirm if it's a good comp, and if not - adjust the comp rent price accordingly.
If this first pass works in terms of numbers, and the rest works too, I would contact local property managers (Google some for your area) and ask them about rents in the area for your particular property, and also ask them to run an analysis and share estimated rent for your target, I would do that once I get a property under contract to avoid doing extra work for properties I cannot even get.