The best portability test for parental controls is not whether an app can be installed on another phone. It is whether the household can move supervision, devices, and adult responsibility without deleting the child's account, losing essential access, or leaving controls in an unknown state. Compare options with a written handoff scenario before choosing one.
Identify the real owner
Record who owns the adult account, family group, child account, device account, billing relationship, recovery method, and Screen Time or supervision passcode. Prefer separate named accounts over a shared adult login. Ask whether a second trusted adult can manage controls, whether the organizer role can change, and what happens if the current organizer is unavailable.
Ownership rules differ by platform. Apple's Screen Time guidance says a child should have a separate Apple Account in the Family Sharing group and recommends management from an organizer or parent/guardian device. Google's supervision guidance ties supervision to the parent and child Google Accounts and lists requirements such as an eligible adult account and, for the documented setup path, the parent and child living in the same country. Compare the current official rules for the accounts you actually use.
Test device and service coverage
List every phone, tablet, computer, console, browser, store, and communication service that needs a rule. Mark each as fully managed, partly managed, or outside the option's scope. Then list the controls that matter: purchases, app installation, web content, communication, location, schedules, and account changes. Do not give a product credit for a control that exists only on some devices.
Read the transfer procedure before setup
A transfer can be a governed account event, not a simple export. Google's child-supervision transfer instructions describe a family-manager transfer, time windows for receiving and accepting it, and a limit on how often supervision can be switched. Apple's child transfer instructions require an invitation from the new family organizer and approval by the current organizer; the exact options also vary with age and region. These documented constraints make organizer continuity and recovery part of portability.
Ask four questions for each option: Can the child account move? Can another adult take over? Which controls must be recreated? What access changes during the move? Write the answers from current vendor documentation rather than assuming two ecosystems behave alike.
Compare evidence and recovery
Check whether the adult can review current settings, save a human-readable configuration note, identify supervised devices, and document exceptions. A vendor export may not recreate controls on another platform, so keep a neutral checklist of the household's required outcomes. Test account recovery without changing or deleting the child's account.
Score each option across ownership clarity, adult handoff, device coverage, settings visibility, recovery, transition risk, and exit path. Give extra weight to any factor that could lock the family out or silently remove a protection. The comparison should end with a tested handoff plan, not a generic winner.