What software are blue SMS and pink SMS icons?

Know the app. According to Zhihu app official website, the icon of Zhihu app consists of a blue message and a pink message icon, and Zhihu is an emotional community software with anonymous questions and answers. Users can talk about their emotional troubles through knowing each other, so as to get advice or comfort from anonymous people; And you can have one-on-one free voice communication with professional psychological counselors to solve emotional problems.