Is there any interest in a service that automatically updates weights automatically in SYSTM? I have made something for personal use that I am considering releasing (for free).
So far it takes weights from Fitbit (which many smart scales can sync directly with) and will sync the weights to Strava, Garmin, Runalyze and SYSTM. Unfortunately for Garmin and SYSTM you have to hand over your password as there is no public API for these services that allows updating of weights. Passwords would be stored on Google Firestore in an encrypted format, with the encryption key held on Google Secret Manager.