The Top Paid chart ranks apps by paid download volume, highlighting the apps users are willing to pay for upfront. The United States is the world's largest app market, and these rankings are closely watched as an early signal of global trends. 3 of these 15 apps are newcomers since the previous update; Karl's Mortgage Calculator Pro made the biggest jump, climbing from #15 to #7; 10bii Financial Calculator holds a steady position at #3, where it has charted for 41 days.