 "Flash of Genius" received mixed to positive reviews.As of January 2016, Rotten Tomatoes reports that "Flash of Genius" has a 60% approval rating with an average rating of 5.97/10, based on 106 reviews.The website's consensus reads, "The touching underdog story of a single guy against a massive corporation, "Flash of Genius" is a well-paced and well-written tale with a standout performance by star Greg Kinnear."