What Is the Semrush App Center? The App Center on Semrush is a platform of specialized marketing apps that anyone can access. While Semrush has an established toolkit for all things SEO, competitor research, and content marketing, the App Center fills in the gaps with even more solutions. Streamlined Payment SolutionSecond, having an App Center integrated with Semrush means that your payment solution for every app and any Semrush plan is all streamlined. To access the Semrush App Center, all you need is a Semrush account of any level—free, pro, guru, or business.