Contact

Luca is made by one person, Ege Beşe. Every message reaches him.

Help. First have a look at the help page.
Privacy requests, including deletion. The delete-your-data page has the steps.
Corrections. If a fact on this site is wrong, including a fact about another product on a comparison page, say which and it will be checked and fixed.
Press and everything else.

Billing and refunds are handled by Apple: reportaproblem.apple.com.

Security reports: the same address. See security.txt.