The makers of Natural Cycles promote it as “the intelligent birth control app”. The app uses technology to become knowledgeable of your cycle and, as a result, promote birth control. It is available in English as a means for birth control in the United States and Europe. It is used as a fertility tracker and is 93% effective.
Rated 4.8 out of 4,200 ratings, Natural Cycles is a 25.8MB app available for a free trial download from the App or Play Store. After the free trial ends, your subscription will automatically renew for $9.99, monthly, or $89.99, annually.