Daysy ovulation calendar is easy, comfortable and precise!
Daysy accurately distinguishes your fertile from your infertile days, making natural cycle tracking simple and reliable. Daysy makes your natural family planning easy and comfortable.
For the most precise results, use Daysy every morning before getting out of bed. Measure your basal body temperature under your tongue for about 60 seconds until you hear the beep. Confirm your period with a button press.
Your fertility status appears instantly:
- Red light: Fertile or possibly fertile
- Green light: Infertile
It's that effortless!
Your ovulation calendar: overview and forecast with the DaysyDay App
Daysy offers more than daily indicators: sync with the free DaysyDay app to access your full ovulation calendar. See your current cycle at a glance, view past data, and get a reliable forecast for the next month. This helps plan around your period (e.g., vacations or sports) or time intercourse for conception.
The app also shows your basal body temperature curve , cycle statistics, and lets you add notes (like intercourse or cervical mucus). Share your ovulation calendar with your partner via the partner app if desired all 100% natural and hormone-free.
How Daysy creates your accurate ovulation calendar
Daysy's algorithm, backed by decades of research, detects the natural rise in basal temperature after ovulation to map your fertile window precisely.
For optimal use of Daysy, we recommend that you should have slept sufficiently (at least one hour) before the measurement. It is important that you take your temperature immediately after waking up, before getting up and becoming active. Measure below your tongue, with your mouth closed, and keep the device steady while it is measuring. Video Tutorial
No. You should have at least one hour of good quality sleep before the measurement. It is important that you take your temperature immediately after waking up, before getting up and becoming active. For optimal use of Daysy, try to get at least 3 or more hours of sleep before measuring. Less sleep can result in more temperature fluctuations causing Daysy to give more fertile or potentially fertile days.
You can confirm or remove menstruation at any time during the current day. Simply press the button to turn on your Daysy, and then press and hold the activation button until the violet light lights up without flashing and you hear a "beep." Confirm you are menstruating for each day of active bleeding and for a minimum of three consecutive days. You can also remove menstruation data for the same day by turning Daysy on and pressing and holding the activation button until the purple/blue light is no longer solidly lit and begins flashing again.
The first 2-4 cycles of use are considered Daysy's learning phase. Over the course of her learning phase, Daysy will come to understand your cycle and begin narrowing down your fertile window. Daysy remains quite cautious and conservative during this time, which is why Daysy is accurate starting the very first day.
You can rely on Daysy's results starting the very first day of use. In the beginning, you will see more yellow and red days because Daysy is still learning your unique cycle. You will see more green days as Daysy comes to understand your cycle and can narrow down your fertile window. The more regularly you measure, the better.
Yes. Irregular cycles are not a problem for Daysy/Lady-Comp. Even with irregular cycles, all Valley devices distinguish between non-fertile and fertile days with a very high accuracy. However, in case of extreme fluctuations between cycles it will give you more red and yellow lights and less green lights. Fluctuations of several days are usually not a problem. If you have questions about your unique cycle, please reach out to our team of experts.
No! DaysyDay is free! There are no in-app purchases or upgrade fees.
In general, you should skip measurements during illness and while you are taking medication that can have an influence on your body temperature or cycle. If you have doubts, contact your doctor or our customer service team.