Interact: Better iOS Contact Management
macsparky.com/blog/2016/1/interact-better-ios-contact-management
From the page
Saved with the link. Notes from 2007 to 2016 are mostly the page's own words, so this is probably an excerpt.
For a 1.0 version application, Interact has a lot of nice touches. Scrolling up and down with your finger on the right edge and searching are both wicked-fast. On the surface, Interact is a fast, clean contacts manager.