Inclusion Criteria:  Provision of signed and dated informed consent form. Stated willingness to comply with all study procedures and availability for the duration of the study. Hemoglobin A1C 5.7% to 6.4% (using National Glycohemoglobin Standardization Program certified point-of-care A1C test). Body mass index (BMI) ≥25 kg/m2 (or≥23 kg/m2 for Asians). Proficiency in reading English. Smartphone user (Android Operating System (OS) 5.0 or iOS 10 or newer). Plans to reside in recruitment area for the next 12 months (participant's zip code of residence is within ~25 miles of both recruitment site and at least one participating local DPP).  Exclusion Criteria:  Medical conditions that prevent adoption of moderate physical activity (per primary care clinician). Aortic stenosis. Unstable cardiac disease (myocardial infarction, heart failure, or stroke in previous 6 months, currently participating in cardiac rehabilitation). Has a pacemaker, implantable cardioverter-defibrillator (ICD), or other implanted electronic device. Use of any glucose-lowering medications, weight loss medications, or any systemic glucocorticoids within the previous 3 months. Active malignancy of any type or diagnosed with or treated for cancer within the past 2 years. Individuals with basal and squamous cell carcinoma of the skin that has been successfully treated will be allowed to participate. Diagnosis of diabetes mellitus. Pregnancy or planned pregnancy in the next 12 months. Anemia. Receiving treatment for iron-deficiency anemia, vitamin B12 deficiency, or folate d efficiency. Hemoglobinopathy (HbS or HbC disease). Blood transfusion in previous 4 months. On dialysis or active organ transplant list. Treated with erythropoietin. Major psychiatric disorder (schizophrenia) or use of antipsychotic medications within the past 1 year. Dementia or Alzheimer's disease. Diagnosed with an eating disorder (anorexia nervosa, avoidant/restrictive food intake disorder, binge eating disorder, bulimia nervosa, Pica, rumination disorder, other specified or unspecified feeding or eating disorder) Diagnosed or self-reported alcohol or substance abuse. Known allergy to rubber or steel. Participation in another clinical trial related to lifestyle management or diabetes prevention. Currently attending or attended a diabetes prevention program in the previous 2 years. Unwilling to accept random assignment