In brief, the study team will attempt to recruit 100 couples in which one partner is a community-dwelling Veteran with significant, untreated symptoms of posttraumatic stress disorder (PTSD) symptoms. All participants will receive access to a mobile app designed by Veterans Affairs (VA). Veterans will receive access to the PTSD Coach mobile app, and their partners will receive access to the PTSD Family Coach mobile app. Potential participants will be identified from targeted Facebook and other social media outreach efforts. Those who view an advertisement will be directed to the study website, hosted by Stanford's Qualtrics domain, where they will be provided with information about the study, screened for eligibility,and then provided with an informed consent document. Upon completing the informed consent process, participants will be asked to complete a baseline survey and then to share information about the study with their partner. Veterans and their partners will be connected only by a subject identification number. After completing the baseline survey, all participants will then be encouraged to use the PTSD Coach app or the PTSD Family Coach app as often or as little as they like.