Hey,
Do you have any tutorials of simple chat app in Ionic 3?
Want to do something like real time chat ~ similar to Whatsapp
google is your friend:
https://melvin0008.github.io/blog/ionic-socketio-chat/
The most interesting part is the backend technology and not the styling in the frontend 
but this looks like in Ionic not Ionic 3 with ts
yeah but you know what you need --> a backend to store messages and e.g. sockets to communicate with the app.
If you get this working you could use ionic cards for a message and a ion input for the text message and some styling