U.S. internet giant Google launched yesterday a smart messaging app aimed at muscling into a busy market with popular rivals such as WhatsApp and Facebook's messenger. Allo's "smart" capabilities aims to make it easier to respond to messages and over time adjusts to users' own style, Google said in an official blog. The app introduces Google Assistant where users just type @google to ask the U.S. search engine questions and have it help you directly in chats, it said. "You no longer need to leave a conversation with friends just to grab an address, share your favorite YouTube video, or pick a dinner spot," it said. The app works on phones using Google's Android system and Apple's iOS.