Daysy fertility tracker reviews: Your trusted natural family planning solution.

Why should you use Daysy?

Daysy fertility tracker offers you a revolutionary way to track your menstrual cycle and practice natural family planning. 

Based on the proven basal body temperature method, combined with advanced technology, Daysy allows you to accurately determine your fertility status and track your cycle - without hormones or invasive procedures. 

With Daysy, you can plan a pregnancy or simply track your cycle and get insights into your cycle health.


What do our Users say?

Women trust Daysy - and for good reason!

With over 40 years of research and studies by Valley Electronics, our first product, the  Lady-Comp launched in 1986, has become one of the most used fertility monitors of our time. 

Building on this extensive experience and continuous research and development, our second product, Daysy, was launched in May 2014 and has since sold over 500,000 units.


Learn more about Daysy

Daysy is a smart fertility monitor that integrates the basal body temperature method with advanced technology. 

With Daysy, tracking your cycle is as easy as counting to three.

In just 30 seconds a day, you can have complete control over your fertility - 100% natural, hormone-free, and effortless.

  • Take your temperature in the morning: Every morning, right after you wake up and before getting out of bed, use Daysy to measure your basal body temperature under your tongue. This temperature provides vital information about your hormonal status, enabling Daysy to accurately determine your ovulation.
  • Confirm menstruation: On days when you are menstruating, confirm it by pressing a button. Daysy will save this information on the device.
  • Data analysis and fertility status: Daysy evaluates your data and uses red, green, and yellow colors to indicate your fertility status. Our intelligent  algorithm, based on over 40 years of research and millions of cycle data points, ensures that this evaluation is highly accurate. For even more detailed insights you can synchronize Daysy with the DaysyDay cycle app.


Yes, taking control of your cycle truly is that simple!

Daysy is not a contraceptive or a period app. It is a menstrual cycle tracker and menstrual health solution that provides a natural, hormone-free method of fertility tracking.


What are the benefits of Daysy?

Daysy offers a variety of benefits, making it the perfect choice for natural cycle tracking and family planning:

Hormone-free and natural: 

Daysy allows you to track your cycle without the use of hormones, enabling you to live in harmony with your body’s natural rhythm. Learn to trust your body without any side effects and live in sync with yourself.


High accuracy: 

With an accuracy of 99.4%, Daysy precisely indicates when you are fertile and when you are not. This accuracy is based on over 40 years of research conducted by a team of gynecologists, fertility experts, software specialists, and engineers. By analyzing more than 10 million cycles, we developed and perfected Daysy's algorithm.

First-class quality and safety: 

Daysy is a certified medical device developed and manufactured in Europe. It meets the strictest quality and safety standards, ensuring a reliable and safe experience.

Easy to use: 

Daysy is very convenient and only takes 30-60 seconds per day. Simply measure your basal body temperature in the morning, confirm your menstruation on the relevant days and Daysy will do the rest. Just wake up, measure and you are done!

No self cycle evaluation required: 

With Daysy you don't have to keep cycle charts. Daysy takes care of all the data analysis and presents the results in a simple and understandable way.


Lifetime support and expert analysis: 

As a valued Daysy user, you're not just getting a device—you're gaining lifetime access to our dedicated support team and expert cycle analyses. Whether you have questions or simply need a little extra guidance, we're here for you. Easily request free cycle analyses by sending your data from the Daysy app to our team anytime. We will craft a detailed analysis specifically for you, providing insightful suggestions and tips to enhance your cycle and promote a healthy lifestyle.


One-time investment: 

With a one-time purchase and no additional fees, you are perfectly equipped to have full control over your cycle for years to come. Daysy offers you a long-term solution without any additional financial burden.

User-friendly app:

The DaysyDay app for iOS and Android synchronizes seamlessly with your Daysy device, providing detailed insights into your cycle. Thanks to Daysy's calendar with simple color coding, you can view your daily, weekly and monthly fertility status, as well as monitor your temperature curve over time and make personal notes.


Connect with your partner: 

The DaysyDay app offers a partner function that allows you to share your cycle data with your partner. This keeps you both informed at all times and allows you to make decisions together.

Data protection guaranteed

Your data is securely stored on Daysy. When you use the DaysyDay app, your data is processed on our servers, granting access to the app and potentially your partner. This data is exclusively associated with the serial number of your Daysy, ensuring pseudonymity unless you choose to disclose the serial number, i.e. to our service personnel. For more details, please consult our privacy policy.

Daysy is a simple and user-friendly medical device developed by women for women. Inspired by the demand for hormone-free family planning, we have created an effective device that is easy to use and minimizes user error.

Are you ready for uncomplicated, natural family planning?


Become Part of the Daysy Community

What if... 

... from now on, you always knew exactly when your fertile days are and when they're not? 

... you could interpret mood swings and other side effects? 

... you knew without worry when to use contraception? 

... you could eliminate the need for invasive methods? 

... you no longer had to keep time-consuming and complicated cycle charts? 

... you could finally feel in tune with your own body? 

... you knew whether you had ovulated or not? 

... you knew exactly when your fertile window is for stress-free planning? 

... you knew exactly when your next period would start? 

... you had control over your cycle health? 

... you could plan for a baby when the time is right for you? 

... you could independently evaluate your cycle? 

... you could immediately recognize cycle fluctuations?

Daysy enables you to do all that and more!


Discover the World of Menstrual Cycle Knowledge

Join our growing Daysy community now and experience the unity and support of women who have chosen natural, hormone-free cycle tracking. 

Share your own experiences with Daysy and help other women make the best decision for their health. 

As part of our community, you'll receive lifelong customer support and access to expert cycle analyses. We're here for you at all times to answer your questions and support you on your journey to natural family planning. 

Follow us on Instagram, TikTok or become part of our Facebook group to join our exciting Daysy community and discover inspiring stories, tips, and news about natural family planning and cycle health!


Who is Daysy suitable for?

  • Women who want to track their cycle: Whether you want to track your cycle for natural family planning, or simply to monitor your health, Daysy provides a reliable solution.
  • Women who desire an all in one menstrual health solution: With Daysy, you can track your cycle naturally, without the use of hormones or other invasive methods.
  • Couples who wish to conceive: Daysy can help couples
  • plan for a baby when the time is right for you by precisely indicating when you are in your fertile window.  
  • Women who want to live in harmony with their body and cycle: Daysy allows you to better understand your body and live in sync with your natural rhythm.
  • Women who have suffered from side effects of hormonal contraception methods or are unable to take hormonal contraception: Daysy offers an alternative for women who wish to avoid the side effects of hormonal contraception methods or cannot use them. However, please note that Daysy is not a contraceptive but serves for cycle monitoring.

Daysy is your right choice for accurate, user-friendly, hormone-free, and natural family planning.


How much does Daysy cost?

Daysy stands for quality and offers a transparent pricing structure and comprehensive guarantee, allowing you to invest with confidence.

  • Price: Our menstrual cycle computer, Daysy, is now available for only €299.
  • Inclusive services: This includes free access to the DaysyDay Cycle App (formerly DaysyView) with no monthly subscription fee, as well as lifelong customer support and access to expert cycle analysis with guaranteed data privacy.
  • Lifespan: Daysy has a life expectancy of at least 5 years. However, many users report being able to use their Daysy significantly longer.
  • Guarantee: Each Daysy comes with a 2-year manufacturer's warranty because we are confident in our quality.
  • Payment options: We also offer payment plans to make the purchase even easier for you.
  • Shipping and returns: Shipping is free, as is the return. If you are not satisfied with your purchase, there is an unconditional money-back guarantee. Simply return your Daysy to us within 14 business days for a full refund without any hassle.

Cost Breakdown

Let's take a closer look at the costs for Daysy:

Cost per year: With a purchase price of €299 and a minimum lifespan of 5 years, the annual amount is only €59 or just €5 per month.

For this you get to experience top-notch quality with Daysy, a medical device Swiss designed and made in Germany. Designed for precision and reliability, Daysy becomes your trusted companion in syncing with your body's natural rhythm.

But that's not all! When you choose Daysy, you also gain access to the DaysyDay Cycle App for free, along with lifetime customer support.

Compared to other popular cycle apps that require a yearly subscription of at least €10 per month and possible additional costs of €120 per year, Daysy proves to be a cost-effective and long-term solution. 

With a minimum lifespan of 5 years, the total expenses for other cycle apps amount to at least €600. Thus, Daysy is your affordable, long-term investment for a better understanding of your cycle and health. 

Ready to take the leap? Reach out to us via email or Instagram for discount codes and more info. Let's embark on this journey towards menstrual cycle awareness together with Daysy!

Daysy - Your choice for natural family planning. Take control of your body and your health. 

Are you ready for simple and natural family planning? 

Discover the precise timing of your fertile and non-fertile phases effortlessly with Daysy. With exceptional accuracy, Daysy empowers you to understand your body's rhythms, enabling you to confidently navigate your family planning goals. By tracking your cycle with Daysy, you gain invaluable insights into your health, fostering a deeper connection with your body. 

Embrace the freedom to take control of your well-being and choose a natural method of family planning with Daysy. Experience the confidence and empowerment that comes with understanding and managing your fertility naturally.