Facebook’s Messenger is now one of the most used mobile messaging apps in the world, with more than 500 million people logging in monthly, the company said Monday.

“This is an exciting milestone,” said Peter Martinazzi, Facebook’s director of product management, announcing the stat. Facebook’s main app has around 1.35 billion users; Facebook-owned WhatsApp has at least 600 million users. WeChat, owned by China’s Tencent, has at around 438 million users, as of this past August.

Facebook reached its milestone, however, as it angered users along the way. The company began requiring people to download Messenger for mobile chat several months ago, drawing criticism from those who didn’t want to download a separate app for messages. Before that, Messenger had roughly 200 million monthly users, the company previously reported in April.

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