I was privileged to present our Enigma simulator app at the Mobile Monday London Demo Night last night; it was pretty nerve-racking, doing a live demo in front of a vocal crowd of 200 knowledgable people with a strict time limit of 3 minutes, but happily the response was enthusiastic and positive!
Apart from giving everyone a quick lesson in how to use an Enigma machine, the main aim was to share the progress so far of our experiment, using in-app advertising and in-app billing for charity fund-raising. This chart shows the numbers of downloads in the few weeks following the app’s release on Google Play (green line) and the revenue breakdown between adverts (dark blue) and donations (light blue):