The A-Level student triumphed over 17-year-old James McCullagh in the series finale of the BBC 1 competition.
"Zara, you're calm, articulate and you look to be in control of your emotions, which is a good thing when you're in business”, Lord Sugar told Brownless. “Zara really showed wisdom and clarity far beyond her years."
"It's incredible to be leaving this as the winner," said Zara. "I honestly never thought I would actually make it this far. The whole experience has been amazing. I've taken more from it than I ever thought I would and it has genuinely been incredible."
In the final, the contestants were challenged to design, create and market new online video games.
Brownless devised a game called 'Piggy Panic' featuring a pig trying to escape from a butcher.
In the boardroom, Lord Sugar said that the viral for 'Piggy Panic' was entertaining and clearly linked to the game.
Nick Hewer said that he thought Brownless "did a very professional job", and Karren Brady described runner up McCullagh as "a very structured person [and] one that's not afraid to take risks and follow their own vision".
Brownless won £25,000 to be held on trust, which she can use to further her fledgling business career.
Copyright Speakers Corner 2017