One out of four Americans older than 65 years old has diabetes. Type 2 diabetes accounts for about 90% to 95% of all diagnosed cases of diabetes. Mobile health technology provides possible solutions for seniors with type 2 diabetes to manage their daily lives. However, our preliminary research shows that only 10% of diabetes apps provided features related to Healthy Coping, which is one principle from the American Association of Diabetes Educators Self-Care Behaviors™, enables people with diabetes to find healthy ways to cope with stress. To alleviate this problem, we have designed a prototype of Healthy Coping mobile app for seniors 72 years or older with type 2 diabetes. Feasibility tests are used to identify if the mobile app will work for the target population as it was designed. To verify whether this Healthy Coping app will be used by seniors 72 years or older with type 2 diabetes, the three most important feasibility tests on functionality, readability, and usability testing will be conducted. Functional testing should be the first thing to test which will confirm that all the functions execute as they are designed. Conducting readability testing will verify whether the app is easy for seniors to read and understand. Conducting usability testing will verify whether the app is easy to use for seniors.