Inclusion Criteria:  Singaporean Citizens and Permanent Residents Aged 21 to 55 Must be literate in English (i.e. able to read and communicate in English) because the primary mode of communication is English Willing and able to use a smartphone Must be at risk of developing Type 2 Diabetes, defined as:  i) Glycated haemoglobin (HbA1c) - At least 5.7% to 6.5% OR Fasting blood glucose of 6.1 to 6.9mmol/L, AND ii) BMI of at least 20kg/m2  Exclusion Criteria:  Non-Singaporean Citizens and Permanent Residents Under age 21 or above age 55 Ever diagnosed as Type 1 or Type 2 Diabetic (does not include previously diagnosed GDM) Pregnant or planning to be pregnant in the next 6 months or lactating History of skin allergies Taking medications that are known to alter blood sugar levels/ glucose tolerance e.g.  glucocorticoids g) History of mental illness/conditions h) Work requirement that does not allow the carrying of electronic devices (e.g., phone and smartwatch) i) Frequent overseas travelling (e.g., more frequently than once a month, daily or weekly commuting across borders etc.)