You can find the Competitor Check tool in your dashboard.
This tool is free and can be used to research your competitors. You can see which products are priced too high as well as too low, and use the repricing tool to change the prices accordingly.
Additionally, see statistics about average price difference, product numbers, and more.
Price difference indicates if you are offering the best price:
If your price is higher than your cheapest competitor, the value is positive (+13%). If your price is lower than your cheapest competitor, the value is negative (-42%).
Protip: sign up for email notifications to keep up to date on price changes.