Heart rate monitoring apps on phones can leverage external sensors or built-in ECG tech to track your heart’s electrical activity. Some, like the Spandan ECG app, connect to devices that deliver ECG readings and detect rhythm issues like tachycardia and bradycardia. These apps make heart monitoring accessible without specialized hardware — ideal for beginners. They sync with fitness ecosystems and provide logs and trends. Great for users focused on health tracking and ECG interpretation.