Daysy is the hormone-free solution for managing your fertility, cycles, and health. Daysy calculates when you are fertile and when you are not. On your fertile days, it is possible for you to conceive; outside of your fertile window, it is not. Daysy supports you in empowered and informed decision-making.

Daysy displays your fertility status as a simple red (you are fertile / possibly fertile) or green (you are not fertile) light.

Daysy is German-made, Swiss-designed, with the foundation of over three decades of pioneering research, innovation, and experience from our family-run company.

Daysy calculates the infertile days with an accuracy of 99.4%.

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