The winning app, called 'Barcode Monsters', is designed to turn shopping into a game. It works by allowing children to scan products in store.
Depending on the nutritional content of the item scanned, the monster character in the app changes colour and gets "happier or sadder".
The two day hackathon event was run by Tesco Labs earlier this month and saw 100 marketers, web developers and entrepreneurs compete to get their app created.
The supermarket had jumped on the hackathon bandwagon in a bid to generate ideas around how to better harness digital, mobile and social media channels to help customers "lead healthier lives".
The hackathon, which was part of Tesco’s wider health strategy, was run by VentureScout, a consultancy that specialises in helping Fortune 500 companies build innovation.
In January, Marketing reported Tesco had launched Labs in a bid to tap into the start-up community and create a "unified and focused organisation to push innovation in every form, including research, development, open innovation, design and culture".