The Duchess of Cambridge's dress sense has inspired a phone app.

The British royal is the star of a new 69p app called 'Kate's Style List' which tracks every Outfit she wears and allows her fashion followers to find out who the piece is by and where they can buy it.

Former actress Helen Barclay - who models her own look on the Duchess' - began developing the innovative tool last Christmas after thinking about how accessible the Duchess' much-coveted style really is.

The 28-year-old fashionista told the Daily Mail newspaper: ''She mixes high street with designer so you can find a lot of the things she wears in shops such as Reiss and Zara.

''I spend a lot of my time trawling fashion websites and looking at the designers' shows online so that I can identify her pieces.

''I also follow a lot of fashion writers on twitter so I know what Kate will be wearing when she next appears.''

The app has already been downloaded by thousands of fans and is proving highly popular In America.

Kate is often seen in British high street labels like LK Bennett, Reiss and Whistles and is a big fan of designers Alice Temperley and Alexander McQueen.