watchOS 5.1.2: ECG app
v1.1 (initial US release)
watchOS 5.1.3: ECG app
v1.2
watchOS 5.2.0: ECG app
v1.10 (now available in Europe and Hong Kong)
watchOS 5.2.1: ECG app
v1.13 (
additional European countries)
watchOS 5.3.0: ECG app
v1.18 (now available in Canada and Singapore)
watchOS 5.3.1: ECG app v1.18
watchOS 6.0.0: ECG app
v1.30
watchOS 6.0.1: ECG app v1.30
watchOS 6.1.0: ECG app
v1.50
watchOS 6.1.1: ECG app
v1.51
watchOS 6.1.2: ECG app v1.51
watchOS 6.1.3: ECG app
v1.52
watchOS 6.2.0: ECG app
v1.70 (now available in Chile, New Zealand, and Turkey)
watchOS 6.2.1: ECG app v1.70
watchOS 6.2.5: ECG app
v1.80 (now available in Saudi Arabia)
watchOS 6.2.6: ECG app v1.80
watchOS 6.2.8: ECG app
v1.90 (now available in Bahrain, Brazil, and South Africa)
watchOS 7.0.0: ECG app
v1.18R395 (now available in Colombia, Israel, Kuwait, Oman, Qatar, and United Arab Emirates)
watchOS 7.0.1: ECG app v1.18R395
watchOS 7.0.2: ECG app
v1.18R402 (Resolves an issue that prevented some users from accessing the ECG app in regions where it is available)
watchOS 7.1.0: ECG app
v1.18R590 (now available in Republic of Korea and Russia)
watchOS 7.2.0: ECG app
v2.18S563 (now available in Taiwan. Atrial fibrillation classification at heart rates above 100 BPM now offered in the ECG app in most regions where the app is available)
watchOS 7.3.0: ECG app
v2.18S801 (now available in Japan, Mayotte, Philippines, and Thailand)
watchOS 7.3.1: ECG app
v2.18S811 (update only for the AW5 and AW SE)
watchOS 7.3.2: ECG app
v2.18S821
watchOS 7.3.3: ECG app
v2.18S830
watchOS 7.4.0: ECG app
v2.18T195 (now available in Australia and Vietnam)
watchOS 7.4.1: ECG app
v2.18T201