The most downloaded iPhone app in the world right now is one you've probably never heard of

Facebook is still dominating the iPhone app world, but Chinese-made apps are quickly catching up.

Facebook-owned apps like WhatsApp, Messenger, and Instagram were among the most-downloaded iPhone apps in the world during the first quarter of 2018, according to new data from app intelligence firm Sensor Tower.

But it was a Chinese music video app called Tik Tok that flattened the competition with more than 45 million downloads over the course of the last three months.

In fact, Chinese apps from internet behemoths like Tencent and Baidu are slowly catching up to Facebook's hold on the app world.

Here's a look at the top 10 most-downloaded iPhone apps in the world last quarter.