Have long to wait for the c't app - and it has paid off I. I read the c't years. For me, it is the trade magazine. App: runs on the Kindle HDX properly. Settlement of purchases (including sole proprietors without subscription) works via Amzaon smoothly. The handling is easy and quick to understand. I personally prefer the HTML display, as the articles are well scaled to the display. Who the default font is too small, which can easily change this in the settings. Individual videos can be downloaded or watched via streaming. The specified c't links will open in a separate browser. (For me, so far not so interesting because I'm used to date the book - perhaps changes over time.) In my opinion, a Zeitungsapp no longer can. Top!