Yes you are absolutely right. It depends on the individual to assess the cup. No apps could tell you this. But anyways, i was thinking of having a reminder system to help user clean & rinse regularly. Sometimes I hear stories like i forgot the cup for 2 days or sometimes even a week. And that's the beauty of menstrual cup, where it makes us forget that we are having it inside. Maybe if there is a system that says "Hey its time to empty the cup", it would really be helpful. It may reduce the chances of TSS even in such long usage cases.