Your fertility isn’t a guessing game
Getting to know your cycle can feel overwhelming at first. Without the right tools, it's hard to know where you are in your cycle and when you're fertile.
We created these devices to give women everywhere a hormone-free, science-backed way to understand their cycle and see their fertile and non-fertile days.
So you can use your basal body temperature (BBT) to track your cycle and fertility with confidence, powered by one of the most accurate fertility-tracking methods available today.
Our fertility trackers are
How to track your cycle with basal body temperature
Basal Body Temperature (BBT) reflects your body's lowest resting temperature and is a key indicator of ovulation. Knowing these temperature shifts is the foundation of accurate ovulation tracking.
Daily cycle analysis you can follow, day by day.
After just 60 seconds of measuring, your device shows you:
- Red = fertile
- Green = not fertile
- Yellow = learning phase / uncertainty
Your device measures your basal body temperature with a sensor precision of 0.05 °C and evaluates it with an algorithm that has been developed since 1986 and refined on over 10 million cycles. In an analysis of 107,020 cycles, accuracy in determining non-fertile days was 99.4%.1
The algorithm adapts to your individual cycle, whether long, short, regular or irregular, and builds in buffer days in your favor.1 When in doubt, the display stays red or yellow instead of showing green:
- with elevated temperatures due to stress or illness
- with irregular sleep
- with varying cycle length
3 ways our devices ensure accuracy
Here’s what sets our devices apart
Medical Evaluation
The high measurement accuracy of the temperature sensors and the precise algorithm of the temperature calculation provide a high degree in method safety, which clearly stands out from competitive devices.