WeChat, the messaging app from Chinese internet giant Tencent, passed 700m MAUs (Monthly Active Users) in March 2016.
That's according to figures from Quest Mobile, which show that WeChat is well ahead of the competition. The second largest app in China is QQ – another Tencent messaging app – with 250m MAUs.
WeChat has also launched WeChat Enterprise, its answer to business chat app Slack.
The service is available exclusively in China, and requires an official business license to set up. Users can communicate with other people within the group via text or voice, including WeChat's popular sticker and emoticons, and make calls that will then be billed to their company.