MigraineX is a Xamarin.Forms mobile app available in both iOS and Android app stores. The app uses weather data to predict when barometric pressure changes will trigger migraines for the user. The back end is on Azure using scheduled jobs to pull in weather data, ASP.NET MVC to serve requests from the app, and Notification Hub for notifications. Since writing this app I have sold it to Cirrus Healthcare. Cirrus and I hold US Patent 10,064,758 for (among other things) this app’s ability to alert users based on barometric pressure changes.