We are natural family planning but I did NOT like the idea of a subscription for natural cycles AND an oura ring subscription, so Ben found me this one instead! Femometer Ring Gen 2 is subscription free, and although it doesn't auto sync with NC, it is super easy to go manually record my read BBT! This ring also measures and tracks sleep, steps, HR, O2, active energy and stress! And it's at least half the price at only $199! (Sales DO happen, I got mine on sale at $179!) LTKFamily LTKBaby LTKActive