Charlie Jordan, who graduated this year in Business Management with Finance BSc(Hons), and Matt Denford and Ryan Hudson (Business Management BSc(Hons)), have set up Ethicul, an app which provides tokens to customers who buy from those ethical stores which are signed up to the scheme.
Collect 250 tokens and the customer can then claim as much as £5 off their next purchase if they spend £25.
More than 100 shoppers and 20 businesses in the Brighton area have already signed up to Ethicul.
Charlie said: “We all moved to the city to study at the university and we were amazed to find so many ethically-minded retailers and shoppers there were – it is one of the greenest places in the country.”