Update: Finally fixed in version 1.0.13
I'm sorry for the inconvenience. I get a few reports that my new Contact Find application crashes on some iPhones in the startup phase. A new version (1.0.1) which fixes the bug has already been submitted to the Apple App Store and should be available soon.
What caused the problem? The application crashes if there are special characters (quotes, double quotes, new lines, tabulators) in an email or phone field of a contact (all other fields including notes are fine). Actually these characters don't belong in these fields but they might have been imported from your desktop address book.