Responsive Chat Website and App

Need to build a chat application which would work in mobile/ desktop and app as well.

Features would be similar to the website https://chatib.us/

Features List:

1. User Profile (Sign In/Sign Up/Guest)
2. one to one chat and group chat (real time)
3. reply on chat
4. Seen/ Read chat
5. Show when someone is typing.
6. Google Ads
7. User List/Group List with search filters (online, gender, age, location)
8. Notification