No. One subscription covers the pair. Whichever of you subscribes unlocks it for both, and the other joins with a six-character code.
Where does our data live?
In your own iCloud account, synced through Apple. We can't read it. Our server only ever holds invite codes for fifteen minutes, your subscription status, and anonymous counts like "a task was created".
Does Corbie read my calendar?
Only if you switch on "share my busy times", and only to work out when you're both free. It publishes time ranges and nothing else. Titles, locations and guests never leave your phone, and turning it off deletes them straight away.
What happens if we break up?
Settings has "Export my data" and "Leave space". You take a copy of everything with you. If you created the space, you can delete it outright.
Is there a free trial?
Yes, fourteen days, and the clock starts when your partner joins rather than when you install. The app is worth very little on your own, so it would be unfair to count those days.
Can I use it before my partner joins?
Yes. The space is yours from the first second. Add what you like and invite them whenever you're ready. Nothing is lost in the meantime.