The fastest way is from inside the app, and it takes seconds:
More → Settings → Delete my account
Write to vesttastudios@gmail.com from the same email address you created the account with, with the subject "Delete my Red Biscuit account". We verify that you own that address and delete the account within 30 days, usually much sooner.
We ask you to write from that address because it is the only thing that lets us confirm the account is yours. We will never ask you for your password.
Notes and photo albums are shared content: both of you edit them and the photos belong to both of you. If we deleted them, anyone could wipe their partner's memories on the way out. The link is dissolved, your partner keeps that content and can delete it themselves.
If you left feedback or reported a bug inside the app, we keep it without your identifier so we can still fix what you reported. Any screenshot you attached is deleted.
This cannot be undone. It is not a pause or a sign-out: the account stops existing and cannot be recovered.
More detail in the Privacy Policy.