Smart Scale Sync is a services developed by Patrick Renschler from Renschler Labs LLC. I hope this Smar Scale Sync will help me to get the weight from the Renpho Smart Scale to Polar Flow (which I use in combination with the Polar Vantage M).
It is an online service that allows you to sync weight metrics from three supported sources Garmin, Fitbit and Withings to support destinations Garmin Connect, TrainerRoad, Strava, Concept2, Peloton, Zwift, MyFitnessPal, Fitbit, Polar Flow and Withings.