The Natural Cycles app tracks your fertility by monitoring basal body temperature, a method validated through multiple clinical studies. Developers affirm its effectiveness matches the reliability of the pill for preventing pregnancy.
Every morning, measure your temperature under your tongue with a thermometer and input it into the app. It calculates your fertile window: body temperature rises by 0.3 degrees around ovulation, and the algorithm accounts for sperm survival up to a week to determine safe days for unprotected sex.
Ready to switch?
If you're thinking of ditching the pill, familiarize yourself with how it works first. For in-depth details on the app and supporting science, visit Naturalcycles.com.
