Increasing Physical activity (PA) is considered to be an important factor in an efficient management of the chronic obstructive pulmonary disease (COPD). The successful methods required to achieve improvements in PA following Pulmonary Rehabilitation (PR), however are sparsely reported. Therefore, the investigators conduct this trial to evaluate the effectiveness of using a COPD management program delivered to the patient through a mobile medical application Kaia COPD-App, after the completion of a PR.

This is a randomized, controlled, open-label, multi-centered trial carried out at in-patient PR-hospital centers in Germany and Switzerland . The interventions will involve use of KAIA COPD-app program (Arm 1) or an active comparator i.e. usual care (Arm 2). Patients completing an in-hospital PR-Program and consenting to participate in the study will be screened for the inclusion and exclusion criteria and enrolled in the study. After fulfillment of the screening requirements, they will be randomized into one of the two arms with parallel group assignment in a 1:1 ratio. The training program will be delivered to the participants grouped to the arm 1 through KAIA COPD-App and arm 2 as provided in regular recommendations or standard of care through the PI. In total, 104 participants will be included to the trial. Treatment period will last for 24 weeks. Electronic versions of Questionnaires will be used to collect patient reported assessments remotely. The primary outcome measure is the change in physical activity of the intervention group in comparison to the control group, measured over one week as mean steps per day with the Polar A 370 activity tracker, from baseline (end of PR) to 6-months follow-up. The secondary outcome measures are functional exercise capacity, health status, sleep quality, exacerbation rate, depression and anxiety symptoms assessed at several intervals.

This study seeks to prove the implications of the Kaia COPD mobile application in COPD patients after PR. The app offers educational, exercise training plus activity monitoring and motivational program that can be easily implemented in the patient's home-setting enabling patients.

Inclusion Criteria:

• COPD Patients willing and able to sign informed consent for use of their pseudonymized clinical data within the scope of the present interventional trial
• COPD patients who have completed an in-hospital pulmonary rehabilitation program with an average duration of 2-3 weeks.
• Diagnosis of COPD, defined as forced expiratory volume in 1s/forced vital capacity (FEV1/FVC) <70% predicted, FEV1<80 % predicted after bronchodilation, with or without chronic symptoms (cough, sputum production) corresponding to a GOLD stage II-IV
• Completion of the screening period and fulfilling of the randomization criteria as defined by the protocol
• Ability to use a smartphone and smartphone-apps
• Willingness to wear an activity tracker during study period of 6 months
• Patients ≥40 years of age.
• Knowledge of German language to understand study material, assessments and contents of the COPD-App

Exclusion Criteria:

• The Patient is not able to conduct the exercise training program due to physical, cognitive or safety reasons, as judged by investigator; e.g., lower limb joint surgery within preceding 3 months, unstable cardiac disease, predominant neurological limitations, planned surgical or other interventions disturbing the study intervention.
• Significant psychiatric disorders, legal incapacity or limited legal capacity.
• Patients participation in another clinical trial with an investigational medication within 30 days prior to study entry.
• Patients already using the KAIA COPD App