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The company's existing video calling and messaging app, Hangouts, requires a Google account which limited adoption, especially in emerging markets.
Facebook's Whats App and Messenger, Skype -- now owned by Microsoft -- and Apple's Face Time used phone numbers to grow faster.
It runs on Wi-Fi and cellular networks, automatically switching between different types and speeds of connection and adjusting video quality.
Duo also uses phone numbers, rather than a Google account or Gmail address, making it easier to call friends, family and other people already stored on smartphone contact lists.
Tech journalist and web developer Clint Ecker came across an ad on Craigslist offering women a free i Phone 4 in exchange for agreeing to be the girl on the end of the phone for sex line chat.