Military Veterans and service members may experience small to negligible benefits on PTSD and depressive symptoms from internet and mobile interventions for PTSD. Civilians may experience moderate benefits at post-treatment, but these gains do not appear to be sustained. Consequently, the available evidence does not currently support these interventions as an effective treatment for Veterans with PTSD. Based on a small evidence base, internet and mobile interventions do not appear to benefit family members of adults with PTSD.