Google Allo is Messaging App. It is to express with help of emoji and stickers in chatting. After downloading you need to sync your contacts and sms service with this app. This app good for faster response with stickers and doodle. There is two option louder and quiter to change your text to caps or small. There is nothing very special in this app only sone quality stickers which is contribution artist. The application is from google inc but not very usefulll not happy with this app. I will give 2 out of 5 star.