Foot complications from diabetes mellitus are one of main causes of lower limb amputation, however, public awareness of diabetic foot care is low. A mobile app “Happy Feet” was developed,s targeting patients with diabetic foot ulcers (DFU). Patients foot awareness substantially increased after three and six months of using the application. Mean total scores between baseline and three months were significantly increased (baseline versus three months, 22.80 versus 25.54; p<0.01), and between three and six months in “examining between the toes” and “breaking in new shoes slowly” (p<0.01). Policymakers and medical professionals benefit from the mobile app by providing accurate and precise information from this group of patients.