Concept
Together with the client, I designed and developed city guide apps for eight metropoles.
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To build a basic app where the concept could be reusable for every city, the publication's content structure and visual system needed to be analysed. Fortunately the book followed a clear structure and provides a digitally adaptable aesthetics.
NEW wonderful study by Christ & Gantenbein on housing typology in Paris Delhi São Paulo Athens http://t.co/EX8LWPaZuV pic.twitter.com/Ve73IZXudk
— NAi Booksellers (@NAiBooksellers) July 9, 2015
The app offers a homescreen-like overview with selectable buildings providing the building's geographic location on a map.

When selecting a building, a picture of the building appears. By swiping left or right, other buildings can be visually inspected. In order to find the building, its location is shown on a map. Also there is a feature to save favorite buildings and to recall them later.

If more information about a building is requested, a modal view of information, building plans and additional pictures opens up.

The apps were featured in Hochparterre.
Every day these apps are downloaded from Apple’s App Store serving as a collection of uncommon urban architecture and as a handy navigator when it comes to visiting one of those metropoles. The apps can be downloaded for free from the App and Play Store:
- Hong Kong (also available for Android)
 - Rome
 - New York
 - Buenos Aires
 - Paris
 - Delhi
 - São Paulo
 - Athens