Participants will receive access to the mobile app "PTSD Coach". Participants will be randomized (by computerized coin flip) to one of two versions of the mobile app. All versions of the app will provide comprehensive information and tools for managing trauma symptoms, but one version of the app will provide personalized, confidential coaching messages delivered by either a Veteran peer or clinical psychologist. Participants will be asked to complete an online survey before using the mobile phone application and again 8 weeks later. Participants will be provided with the option to complete a telephone interview after 8 weeks of using the mobile phone application. To be eligible, participants must be a U.S. military Veteran, age 18 or older, have received a previous diagnosis of PTSD, and own an iPhone or iPad device.
