the space between two of you
Paste the two values from your Supabase project. You'll find them under Project Settings → Data API. Both phones use the same values.
These are stored only on this phone. The anon key is safe to use in client apps — your data is partitioned by couple code.
just for the two of you
Are you starting this for the first time, or has your partner already set it up and shared a code with you?
When are you next together?
They'll see this on their phone.
Just the two of you.