For people with diabetes who are at risk of foot ulcers, this study compares three digital foot care strategies (with different levels of intensity) to see which one is more effective at preventing ulcers and easier to use.

Inclusion Criteria:

1. Age ≥ 50 years but < 80 years;
2. Assessed to meet the criteria for the high-risk population for diabetic foot as defined by the International Working Group on the Diabetic Foot (IWGDF) (risk level 3);
3. Capable of using a smartphone to take photos and operate apps, or able to do so after simple training;
4. Willing to participate in the study and sign an informed consent form.

Exclusion Criteria:

1. Currently has an open foot wound or an unresolved foot ulcer;
2. History of major lower limb amputation above the ankle joint;
3. Pregnancy or breastfeeding;
4. Currently suffering from poorly controlled malignant tumors;
5. Receiving glucocorticoid or immunosuppressive therapy;
6. Diagnosed with vascular occlusive vasculitis;
7. Presence of foot fracture;
8. Significant visual impairment affecting image acquisition or operation;
9. Other conditions deemed inappropriate for participation in this study by the research team.