What's the name of the weather forecast applet?

Due to the refraction of sunlight, Cai Yun is a colorful cloud, mainly red, which appears on the horizon in the early morning or evening on a sunny day. Cai Yun has a nice name, which is related to the weather and is very suitable as the name of a weather forecasting applet.

Applets are applications that can be used without downloading and installing. Launched by Tencent on 20 17 1.9, its concept is to apply "at your fingertips" and "run when you use it". Its advantage is that users don't have to care too much about application installation and avoid frequent application switching.