Yes! Many members of our community chart their menstrual cycles simply to support their wellbeing through self-awareness / self-care practices. You don't need to be sexually active or trying to meet certain fertility-related goals in order to use the Read Your Body app :)
When you very first open the app you'll be invited to indicate within the welcome flow whether you're sexually active or not. If you're not then all intimacy options will be defaulted to hidden in the app for you (you can always make them visible if / when needed).
The app can be set up with a wide variety and unlimited number of custom info lines to track cyclical symptoms and lifestyle factors including mood, exercise, etc. Happy tracking!