But Gail Davis of Orpington, Kent, was not the only British winner - the app she downloaded was also the work of a British firm.
Paper Glider, currently the number one free app in the UK App Store, was developed by Cirencester-based firm Neon Play .
"We've been eagerly discussing the 10 billion app countdown in our game studio, so when I got a call from Apple Cupertino saying they had some 'good news', I thought they might tell us they were featuring one of our apps on the App Store,” said Oli Christie, CEO of Neon Play.
“So when they said that Neon Play's Paper Glider was the 10 billionth app, I was completely and utterly dumbstruck. It's a great piece of news for the whole Neon Play team," he continued.
Davis also received a call from Apple, though according to reports, she hung up on the caller, seemingly believing that it was a marketing call.
As it was actually one of her daughters and not Davis herself that downloaded Paper Glider, making her dismissive attitude understandable. Fortunately, Apple rang back, enabling Davis to claim her $10,000 (about £6,275) prize.