Which free chat module for Android and iOS should I use?

Question

Mobile development

Tell me which free chat module for Android and iOS to use? We are writing an application in which we need to integrate the simplest chat module. Are there such modules in the open form? We will do the server part ourselves, the main thing is that a solution is found for applications, since we cannot spend time working from scratch.

Answer 1

https://github.com/badoo/Chatto
https://github.com/badoo/Chateau

Answer 2

You can try this
https://youtu.be/RX5kFtUI7q0