If you've got a better suggestion for secure group chats on iPhone, Android, Windows Phone, OS X, and Windows, please let me know! My family uses telegram exten

If you've got a better suggestion for secure group chats on iPhone, Android, Windows Phone, OS X, and Windows, please let me know! My family uses telegram extensively, but I'd love to replace it with something better if there's anything with similarly good UX on all of the platforms we use.