The upstart Chinese mobile device maker Xiaomi says 100 million people around the world are now using devices running its MIUI firmware platform.

MIUI (pronounced “Me You I,” a play on UI, the common abbreviation of the words user interface) is an aftermarket firmware platform based on Android.

The company says the firmware now runs on 347 different mobile devices from 96 brands.

Xiaomi says it saw 135 percent growth last year, selling 61 million devices. That’s up from selling in the mid 20 millions of devices in 2013. Revenues last year were the equivalent of $12 billion U.S.

It adds that it is the biggest handset maker in China, with a 15 percent market share. Apple, research shows, sold more smartphones than anyone else in China in the last quarter of 2014.

Xiaomi was founded in 2010 and has leadership recruited from Microsoft, Motorola, and Google.

In August 2013, the company hired Hugo Barra from Google. Barra was Google’s vice president of product management for Android.