CardStar Inc., a company that makes a popular mobile application to organize store loyalty cards, is now including daily deals service Groupon in its app.

Boston-based CardStar said it is the first mobile loyalty app to integrate with Groupon. CardStar launched its app for the iPhone in January 2009 and has 1.3 million users. The CardStar app uses the GPS technology built into mobile phones to identify a user’s location and display Groupon deals for that area. Users will need a Groupon account to buy the deals. Get the full story »