Kuty Shalev_is the Founder of_eight hours_to develop, and when it first launched, it had one singular function: to send “Yo” to the user’s friends. The app_survey_of more than 7,000 consumers, what makes consumers “sticky” is simplicity. If you’ve got a great idea for a product, you should set your sights on creating a prototype in 90 days to test your idea, gather feedback and get to market quickly. 90 days forces you to focus One advantage to building a prototype in 90 days is that it forces you to narrow your focus. “Simple designs are easier to understand, cheaper to...

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