The app is based on The Love Dare, a non-fiction marriage-related book written by Alex and Stephen Kendrick. It is a 40-day Christian devotional designed to strengthen marriages. Each daily devotion includes scripture, a statement of principle, the day’s "dare," (such as "Resolve to say nothing negative to your spouse at all") and a journaling area and check box to chart progress. It is used in the storyline for the 2008 film, Fireproof, which is directed by author Alex Kendrick. For Valentine'