Backlink Gap

 Backlink Gap is a tool provided by Semrush that allows you to compare the backlink profiles of up to five competing websites at once. You can enter the domains and Semrush will list all of the referring domains that are sending links to these sites. Filtering makes it easy to identify the websites that are linking to your competitors but not you1. You can also uncover the gaps between you and the other websites in your niche with the most backlinks2.