Daysy does not equate contraception! We help you to determine exactly WHEN you have to use contraception.

Calculating ovulation days made easy

With Daysy you get to know your cycle: quick, simple and with 99,3% accuracy!

You want to calculate the fertile days in your menstrual cycle but dread the workload? We understand that – and have therefore developed Daysy! Daysy is a particularly convenient and easy to use cycle monitor that calculates your fertile and infertile phases based on your basal temperature. Daysy has a unique algorithm that required several decades of research and studies. With Daysy, knowing whether you are currently fertile requires only a few minutes every morning. 

And this is how it works: Every morning before you get up you remove the protective cap, activate Daysy via the push of a button and then put Daysy's highly sensitive test prod underneath your tongue. After 30 to 60 seconds, a peeping noise lets you know that the measurement has been done successfully. Daysy immediately displays your current fertility status to you. If a red light is showing, it means that you are fertile within the next 24 hours. If, however, a green light is showing, that means that for the next 24 hours, you will not be fertile. You see that calculating your fertile days based on your menstrual cycle with Daysy is so simple!

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Calculate ovulation days with the menstrual cycle

But how does the calculation based on basal temperature work? The basis for Daysy to be able to calculate your fertile days based on your menstrual cycle is the natural female cycle and the influence that hormones have on your basal temperature. In the course of the cycle the basal temperature changes in a certain way for every woman. Even when the strength of the temperature changes and the precise timing are individually variable, what applies to all women and all menstrual cycles: Around the time of ovulation the basal temperature rises by 0.3 to 0.5 degrees celsius (32.5 – 41 degrees Fahrenheit) and stays on this slightly elevated level until the onset of menstruation. Precisely this change in your basal temperature is what Daysy can measure and evaluate very precisely with the help of its algorithm. Through this evaluation, Daysy can not only determine the time of your ovulation, but also the beginning and end of your fertile phases.

You can decide - with knowing your ovulation days

When using Daysy you can always choose what you want to do with your knowledge about your fertility. If you are, for instance, planning a pregnancy, Daysy can help you to find the perfect time to have sex. Because you are only fertile and able to conceive a child on the day of your ovulation as well as a maximum of five days prior to that. This is what makes the right timing very important when you want to have a baby. With the knowledge about your menstrual cycle and your fertile days, you can help along your dream of being a mother.

If, however, you do not want to become pregnant, Daysy can show you when you have to use contraception. In general, it is safest to avoid sex on days that are displayed as red and are thus fertile. If you do not want that, you should use a barrier method such as a condom or a diaphragm. The correct use is important for the safety of these methods of contraception and it should ideally be trained beforehand during infertile days. 

In any case, Daysy and the free app DaysyView offer you the option to get to know your body and your menstrual cycle better. Also, the use of Daysy is 100 % natural, hormone-free and free of side effects.

Discover all the advantages of Daysy now and calculate your fertile days based on your menstrual cycle!