Is there an extremely basic period-tracking app that simply lets you input dates and tells you when the next start date will be? I tried using Clue, but it's screwing up the cycles - my period started 2 days early and it's recording that as "day 26 of last period" rather than "day 1 of next period" and I can't seem to change it, plus it doesn't let you forecast more than a few months in the future without paying for the app. I just want a no-frills app that isn't going to make my life harder, isn't going to sell my data, and I also don't need to track every symptom, etc. Obviously I don't want an app that refers to me as a "bleeder" either. Any recs for something super basic that will get the job done?