Bill Moore

As Hurricane Harvey dropped anchor over Southeast Texas last week, Zello became the go-to app for rescuers working to save thousands of people trapped by floodwaters. Within days of Harvey's arrival, the app saw a 20-fold increase in usage in Houston, according to Bill Moore, the Austin based startup's the chief executive. As Hurricane Irma hurtles across the Caribbean toward the coast of Florida, Zello continues to boom in popularity. The free Internet "walkie-talkie" app - which relies on cellphone data plans or WiFi and is designed to operate in places where signals are weak - became the top app on iTunes and Google Play Wednesday...

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