Why does the Modern Fertility App only work with the Modern Fertility Ovulation Test?

The Modern Fertility Ovulation Test is a semi-quantitative test — it gives you a numerical value of your LH, telling you where it falls within a range. That's a fancy way of saying it shows you exactly how much LH is in your urine with day-by-day color changes instead of one "yes" or "no" answer. Our app is calibrated specifically to read the changes on our strip. That means it's unable to scan other ovulation tests.