Pros:- appearance- cycle history page - accurate application of Sensiplan rules (as far as I can tell)Cons:- personal information is not kept private; both Read Your Body (RYB) and drip. (competitor apps) store data locally on device, and RYB offers ENCRYPTED back-ups for those who opt in; the makers of ovolution do not keep private information private and think that it's fine because they pseudonymize/anonymize it; there is no option for opting out of this- for days in luteal phase after ovulation confirmation, user is required to continue inputting data for the app to accurately show "luteal phase" as the cycle phase instead of "not enough data"- blog posts/further reading section contain misinformationIf the app were free, I would be fine using it to log some of my less sensitive personal data (biomarkers but not intimacy), and if it had a privacy policy like RYB or drip., I would be willing to pay for it. Unfortunately it passes neither test, and I'm not going to reward a company that doesn't value user privacy by giving them my money.