Zulip Messenger

** Only usefull for invited or self hosting users **
Zulip Messenger is a FREE Messaging-App. Zulip Messenger is using the internet connection of you smartphone to get messages from your own hosted zulip server. There will be no other fees for using this app.
This app is only usefull if you are a business or maybe private customer and you or your company has a self hosted zulip server.