Inclusion Criteria:  Women diagnosed with GDM according to IADPSG (International Association of the Diabetes and Pregnancy Study Groups) criteria, i.e. fasting plasma glucose between 5.1 mmol/L and 6.9 mmol/L after the 6th week of gestation and/or 1-hour plasma glucose value after 75 g oral glucose tolerance test (OGTT) ≥ 10.0 mmol/L and/or 2-hour plasma glucose value between 8.5 mmol/L and 11.0 mmol/L at the 24-31st week of gestation Age >18 years Gestational age >= 12 and < 32 weeks No more than 4 weeks after confirmation of GDM diagnosis Singleton pregnancy The ability to navigate an app Provided informed consent  Exclusion Criteria:  Preexisting diabetes of any type before the current pregnancy Need for insulin therapy at the time of screening Heart failure Chronic kidney disease History of bariatric surgery Use of long-term systemic corticosteroids Impaired mobility Known fetal malformations Concomitant participation in other clinical trials