Does a flexible date car rental price matrix tool exist, a la Google Flights?
I know there are comparison rental tools like Kayak and Expedia, but I'm specifically thinking of a tool similar to Google Flight's flexible date matrix, where they'll show you the lowest prices for a matrix of different combinations of start and end dates.
I've found that with car rentals, the prices can change drastically just by booking a day earlier or later, or sometimes even just hours apart, to the tune of 50% price reductions, and doing this all manually is pretty time-consuming and error-prone.
To be clear, since this was closed out as a duplicate the last time I asked: I know car rental price comparison tools exist, but those only compare prices between agencies for a specific start-end date combination. I'm asking about whether something similar to Google Flight's flexible date tool exists, where you can get a sense for price changes across multiple start/end dates/times and durations, like so: 
Best Answer
I don't think it exists, and probably because there is little need / support.
Car rental prices are typically constants per day and per week, with the price for the week being about five times the daily price. With that, it is relatively easy to do the calculations - shifting the start day has zero effect, and increasing the length gives every sixth and seventh day no or minimal price change.
On top of that are of course some company specific 'specials', those have all kind of rules that change all the time, and they are typically limited in duration. They are not always known in advance, so it is difficult to predict them.
So a matrix comparison would be often of little interest, and the specials are not accessible in any automated way (like for flights). Also, most people are bound with their dates from the flights they book.
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Answer 2
No, such a tool does not exist as of 2018.
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