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Meet Daysy – your personal fertility calculator.

Daysy lets you make the choice!

Daysy is a fertility calculator that uses the fertility awareness method by learning and tracking your menstrual cycle. Daysy shows you the days you are fertile or not. This way, you can plan a pregnancy or use a hormone-free, barrier method to prevent a pregnancy, you choose.

Daysy will show you if you are fertile or not with an accuracy of 99.3%. It is all natural and free of side effects.

A fertility calculator as easy as 1,2,3...

Just 30 seconds once a day

  1. Every morning, take your temperature under your tongue.
  2. Confirm menstruation on the days you have it.
  3. Daysy evaluates your data and calculates your fertility status for the next 24 hours.

"I would absolutely recommend daysy. I am very conscious of what I put into my body, so when I started researching the pill I knew it wasn't the form of birth control I wanted to use, and I wanted to use a natural form of birth control and trust my body. I thought tracking my cycle would be complicated, but Daysy makes it so easy! Right now, I'm not planning for a baby but I know Daysy will be just as helpful in that stage of life as Daysy is right now."

Brooke, Preschool teacher

"I recommend Daysy to everyone. She and I are good friends. Switching to using Daysy instead of the pill or other hormonal birth control was the best decision I ever made. It helped eliminate the need for not only the pill, but it also helped reduce the postpartum depression I was suffering from, and allowed me to ween off my medication as well. Being in touch with my body is such a wonderful feeling and I feel much more in control of not only my fertility but also my life."

Amanda, Stay at Home Mom

"Daysy allows me to take control of my cycle without hormones or side effects. I can use Daysy and not have to worry about making errors the way I would with the calendar or mucus method alone. I can be confident that I am understanding my body well and being responsible with my future!"

Anonymous, high school math teacher:

"I would say that daysy is one of the most fantastic purchases I have ever made! It has taught me to listen to my body and its natural cycle rather than changing it with unnatural methods. I would most definitely recommend this product to my best friend, in fact, I have! "

Natalie, student
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EUR 290.00

incl. VAT and Shipping
Product available - Delivery time: 3-5 days*

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You can rely on daysy.

The fertility monitoring algorithm in daysy has been developed with feedback from millions of cycles and uses advanced statistical methods to calculate your fertility status.

Daysy's program relies on the Lady-Comp algorithm. The Lady-Comp, is the most popular fertility monitor internationally.

The fertility calculator is programmed to accurately determine and display the time of ovulation in the female body by taking your daily basal body temperature.

  • Red = fertile
    Red days are when to plan for a baby.
  • Red blinking = ovulation day
  • Green = infertile
    Green days will not lead to pregnancy.
  • Yellow = learning phase/cycle fluctuations
    Daysy needs to learn more about you. If preventing pregnancy, treat as red days.
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Daysy has an App.

Simply connect your Daysy fertility calculator to DaysyView to see all your cycle data.

Once Daysy is connected to her app, she will automatically start syncing data with DaysyView.

DaysyView lets you see your temperature data and fertility prognosis.

Share your data with your loved one, and let them know when it’s the “right” day.

Meet daysyView.

  • See your daily, weekly and montly status of fertility
  • See your color - coded monthly calendar
  • Make notes
  • See your cycle forecast
  • See your temperature curve and values
  • See your fertility and cycle statistics
  • Share your data with your loved one through daysyView Partner App
  • Enter sexual intercourse
  • Get notified when something changes in your cycle
  • Contact our expert team for advice and support
  • Get free cycle analysis

 The medical basics of a woman's cycle

 

Every woman is different,

but these are the basic physiological factors to a woman's menstrual cycle that you should know:

  • Every woman usually only ovulates once per cycle.
  • If two or more ovulations take place, these would occur within 24 hours.
  • After ovulation, the egg can be fertilised for a maximum of 18 hours.
  • Inside the female body, sperm remain able to move and fertilise for a maximum period of 5 days.

This means that a pregnancy can occur on only 6 days, which are the 5 days prior to ovulation and the day of ovulation itself. Daysy calculates these 6 days and displays them to you.

Exactly how does the fertility calculator Daysy work?

Daysy recognizes a woman's ovulation in her cycle through a morning measurement of the basal temperature. Simply measure the temperature under your tongue to know whether you are currently fertile or not. Depending on the phase of your cycle, you will either see a green light or a red light.

Beyond that, Daysy records the course of your cycle and shows you which processes are currently taking place in your uterus. There is hardly a simpler way to attain awareness of your female body.

When comparing Daysy to your alternatives, what makes this cycle monitor so special is that it bears no side-effects: no hormones, no thrombotic risk, or any other accompanying effects. It does not get any better than that!

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*Applies to deliveries to Germany. Delivery times to other European countries are extended by an additional maximum of 10 days. Countries outside Europe are not supplied. The deadline for the delivery begins with payment in advance on the day after the payment order has been issued to the transferring credit institution or in the case of other forms of payment the day after the contract is concluded and ends with the expiration of the last day of the deadline. If the last day of the deadline falls on a Sunday or a public holiday recognized by the State as a delivery place, the next working day shall be replaced by such day.

Accepted payment methods: Credit card, PayPal, advance payment