I found a lifetime deal chat app on AppSumo and it looks nice with direct chat to support clients and group chat for multiple people in a chat room.
Check it here Babiators https://appsumo.com/products/pinchat (I am not affliate with them or AppSumo)
Demo: https://pinchat.me/brianfang
Check it here Babiators https://appsumo.com/products/pinchat (I am not affliate with them or AppSumo)
Demo: https://pinchat.me/brianfang
