Withings has launched its first new products in almost three years, having survived a period of ownership by Nokia.
Two Withings Move watches minimise the "smart" but provide continuous fitness tracking, and boast a battery life of 12 and 18 months.
The latter, however, includes an ECG (electrocardiogram) sensor the user can activate in the case of atrial fibrillation (irregular heart rate).
The Move has been priced at $70, $130 for the Move ECG – fitness band territory.
Most of the Watches Apple sells are the 2017 Watch 3 or older.
Less than 20 per cent of Apple's Watch sales were Watch 4 in Q3, IDC said last month (Apple and the retail channel continue to sell both 3 and 4 series).