SpyFu is a secret weapon for hustlers. Digital marketers and popular online businesses use it to learn about their competitors. It comes with a reasonable pricing scheme and gives you great information about similar businesses in your industry.
You can use it for analyzing competitor backlinks, track your (and their) keyword rankings, provide crucial contact information to attract more leads, and help you to increase your traffic.
Unlike Semrush, SpyFu works great for US/UK market. One of the coolest features of SpyFu is "Advanced Sale Lead Information" which can be crucial for businesses working in B2B markets.