Sweetgoals for Type 1 Diabetes

The study will test an app and web-delivered intervention designed to improve glycemic control (HbA1c) among young adults with Type 1 diabetes. All participants will receive the "core" digital intervention, the SweetGoals app, focused on self-monitoring and goal setting. Efficacy of two independent intervention components (incentives for adherence and web health coaching) will be tested

Inclusion Criteria: * Have a diagnosis of T1D for \>18 months * Have A1c ≥7.5% * Report a visit with physician managing type 1 diabetes (T1D) within the previous 6 months * Participants must use a glucometer or continuous glucose monitor compatible with Glooko. Exclusion Criteria: * Pregnancy or breast feeding * Severe medical illness that would preclude participation (e.g., cystic fibrosis, developmental disability, severe cognitive impairment) * Psychiatric illness that would preclude participation * Diabetes diagnoses other than T1D (Type 2 Diabetes, Maturity Onset Diabetes of the Young/MODY) * Use of any medications known to impact glycemic control (oral or injectable corticosteroids, beta-blockers, antipsychotic medications such as risperidone). * A history of known hemoglobinopathy, anemia, or transfusion (which could alter the validity of HbA1c measurement) * Already being engaged in a psychological intervention targeting diabetes adherence.