1, see how you define a fun APP. There are too many categories of apps.

2, the game APP, the glory of the king, Yin, are all popular, and there are chicken eating games and so on.

3, casual game APP, sugar-free casual games are enduring, as well as temple escape, cards and so on.

4, video APP, this is also a lot, Tik Tok, auto is faster, volcanoes and so on.

5, social category, of course, the most used is WeChat, as well as Momo, exploration and so on.

6. I hope it helps you.