Why you can't use Natural Cycles offline
Natural Cycles only works when you are connected to the Internet. As the algorithm runs on servers, and not within the app, it is important to have an internet connection. This way we can get your results to you straight away and ensure that they are always up to date.
Cycler tip: If you don't have internet connection, keep measuring as usual every day and add the values as a note within your phone so that when you have internet connection again, you can easily add all data points.