Magazine Style News Reader App Cross Platform iOS Android

We are looking for a Magazine style cross platform App (think Flipboard styling) for a non-profit organization. The goal of the app is to consolidate content from three different source, our local, state and national organization chapters into a single Flipboard Style [login to view URL] content will be pulled in two different ways. First - Three separate digital newsletters that contain links to articles. From those links we need to pull the main image (if there is one), headline, and first few lines of text. Then if that is clicked, the app shows the full article from it's original source within the app. All three sites use latest version of Wordpress so formatting should not be an issue. Second - A web based admin tool allowing additional content to be added: Add/Remove Sub-Categories, and Add "articles" into the app (into the appropriate tagged sub-section section of the app) Below is an overview of must have features to be bid on. *We will provide designs 1. Main screen several buttons (image tiles) of top categories- each going to sub-categories with same style as main page that are all articles 2. navigation stays within the app - click to an article does not take user out of the app (ala Flipboard) 3. cross-platform ability for Android & iOS phones