Google Flights, and probably other travel sites, has a great tool to find better prices based on dates (or date ranges).
For example, here is the Date screen from Google flights
and an example Price Graph
I'm trying to find one that does something similar for Hotels. Enter a destination and approx dates into a search and then click on Dates/Price to find when it might be possible to get a room for cheaper.
Can anyone recommend such a service? I'm surprised Google Travel doesn't do this, as it's such a great feature of Google Flights

