Gestational diabetes mellitus (GDM) is the most prevalent complication in pregnancy. Patients' follow-up and treatment is performed in specialized GDM clinics that teach and support women in implementing lifestyle changes, blood glucose self-monitoring, and nutritional and pharmacologic therapy. Recently, mobile health (mHealth) applications have been introduced as a resource to improve self-management and follow-up among pregnant women. The proposed study will examine the efficacy of the GDM management mHealth application in improving patients' compliance and satisfaction, glycemic control, and pregnancy outcomes. A multicenter randomized controlled trial of women with GDM treated in the GDM clinics. Women will be randomly allocated to a research group that will use the GDM application and a control group that will receive regular follow-up without the GDM application. The primary outcome is patient compliance, defined as the actual blood glucose measurements/instructed measurements ×100. Secondary outcomes include glycemic control parameters, and maternal and neonatal complications.