A free program for Android, by The Social App.

The Social App – Make Paid Chat

Social App allows you to create a subscription-based group chat and charge your followers a membership fee. This is the perfect way to keep in touch with your closest friends and family with normal and regular chats without having to worry about everyone seeing your messages. Plus, with Social App's incognito mode, called Ninja Mode, you can be sure that your conversations will stay private.

You can do more with Group Chats

Be a Ninja

· Enable "Ninja Mode" to send a private text! ~Spooky~

· Blocks SCREENSHOTS & SCREEN RECORDING of anything sent in Ninja Mode.