You can access the Product History page of a product by clicking the 'History' button available for all products. This page displays a chart of the price history on competitor websites for up to one year, with data shown in periods of up to two months. You can export the data from the 'History' section. Also, you can select & compare different competitors' historical price changes
In addition to the 'Chart View', which shows price changes over time, you can also use the 'Calendar View' to select a specific date and view the prices for that date.
Note: The Product History feature is only available for Platinum & Custom Plans.
Chart View:
Calendar View: