One tap. Face ID, Touch ID, or device PIN — no email needed if you've registered a passkey on this device.
Sign in with email — no password. We'll send a magic link. Click it on whichever device you want to add. Your wife uses her own email, gets her own link, joins the same vault.
You're signed in. Anything you check off, plan, or scale syncs to everyone in this vault.
They'll get a magic link. Clicking it joins this vault on whatever device they open it on.
A passkey lets this device sign in with one tap — no email round-trip and no signing-out from storage eviction.