Not good

Not useful for family planning. The basal temperature chart Is impossible to read because it uses such large intervals. It goes from 93 to 96 to 100 which makes your charted temperatures look like a straight line. Also, it ignores all cycle indicators and relies solely on your own estimated cycle length to estimate future cycles. So if your cycles change or you happen to ovulate early, your cycle predictions dont change so you could miss fertile days. Not good if you want to get pregnant or avoid it.

cld0478 about Fertility Clock: menstrual period + ovulation log, v5.1