An Australian start-up that is trying to become the default option as a business card for the digital era has pulled in major US investment that values the company at $200 million, after global user numbers surged to over 2.5 million.

It may sound like a simple idea, but Blinq has turned an entrepreneur’s hunch that a dynamic digital contact profile could replace the centuries-old calling card, into a viable business that has just closed a $US25 million ($38.7 million) funding round, led by US-based Touring Capital.