Is FanDuel Legal In Indiana? Will the FanDuel App Work in IN? A Is FanDuel Legal In Indiana? Will the FanDuel App Work in IN? FanDuel Sportsbook is legal in Indiana and the FanDuel App will work in IN. Take a look at our in-depth FanDuel Sportsbook Review for the best Promo Codes for your state. Related FAQs Is William Hill Legal in Indiana? Will the App Work in IN? What is the Legal Betting Age in Indiana?