Personal first
Log in kg or lb. Add private notes that a Partner never sees. Optional BMI is a general adult reference, not a diagnosis.
Weight tracking for two
Keep your own diary — entries, goal, notes, units and reminders. Invite one Partner only when both of you want a shared chart. Histories never mix.
Together, on purpose
A connection starts only after an invitation is accepted. Permission to log for the other person is off by default and one-way unless both enable it.
Yours if you leave
Disconnect anytime. Both people keep their own history. Guest records stay on the device until you choose Google backup.
Start alone. Connect later.
Guest mode needs no account. Google sign-in unlocks cloud backup, restore and Partner. Use one device to save both people without combining the underlying data.