Google has just announced that Android customers around the world have downloaded more than 10 billion apps.

“One billion is a pretty big number by any measurement. However, when it’s describing the speed at which something is growing, it’s simply amazing. This past weekend, thanks to Android users around the world, Android Market exceeded 10 billion app downloads—with a growth rate of one billion app downloads per month. We can’t wait to see where this accelerating growth takes us in 2012,” said the company in a statement on their blog.

To celebrate the fact, SwiftKey, currently the UK's number one paid for app on Android, is being reduced to £0.10p / €0.10¢ / $0.10¢ from Tuesday - Wednesday to celebrate.

The promotion is the start of 10 premium apps getting a huge discount over the next 10 days

SwiftKey X, which replaces smartphone keyboards with one that uses natural language technology to make typing easier, is being featured on the first day of the celebration from 6pm GMT, at an incredible 95% off its list price.

Joe Braidwood, CMO of SwiftKey, said: “We’re really thrilled that Android Market chose to showcase SwiftKey X on day one of such an incredible milestone. It’s exciting to think about how many people across the world will be able to unlock the power of SwiftKey today at such a low price.”

Other apps to be included will be:

Asphalt 6 HD, Color & Draw for Kids, Endomondo Sports Tracker Pro, Fieldrunners HD, Great Little War Game, Minecraft, Paper Camera, Sketchbook Mobile, Soundhound Infinity and Swiftkey X.

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