Each of the four FamilySearch.org Partners, Ancestry.com, Findmypast.com, MyHeritage.com and AmericanAncestors.org, have dedicated apps in the FamilySearch.org App Gallery.
Full descriptions of each of the free apps are available from links from the icons. Here are the links.
If you are a tablet or iPad user, then these apps may be just the ticket you need to get started with these programs. If you are an LDS user, you have free access to all four programs and can sign into the apps with your login and password.