WeChat basically created a platform, allows third party apps to have their html5 version of app in WeChat platform. Basically the same as Google Login. You can choose to use their independent version of app directly to do the same thing. WeChat is very successful on this platform, I can imagine future phones just need WeChat to work properly and all the apps in it will function. Those apps are not WeChat or Tencent apps though, just web apps work inside WeChat.