The phone is the third wheel in your relationship. You each pick the apps that steal your evenings. At bedtime one of you taps the heart and both phones go quiet until morning. The only way out early is to ask.
$4.99 once. Your partner joins with your code. Calls, messages and alarms always work.
Full heart = both kept it. One colour = one of you asked out.
One of you buys it. The other joins with your code.
Android first, iPhone next. One email when it launches, nothing else.
$4.99 once. Your partner gets it free.
No subscription, no third wheel.
It's not a parental control and it's not one of you policing the other. Both phones lock or neither does. Neither of you can see the other's app list. And there's always an emergency unlock, because life happens; it just gets recorded.