Inclusion Criteria:  Over the age of 18 years of age Confirmed COPD diagnosis defined as the presence of post- bronchodilator FEV1/FVC <0.70. COPD category GOLD A, B, C & D. Those who are able to give informed consent Has a smart phone and is capable of using a smartphone app to input data? Good dexterity to use the spirometer and pulse oximeter  Exclusion Criteria:  n/a