Daysy Simple & Easy Fertility Cycle Tracker

Many women are frustrated with today’s birth control & fertility cycle management options.

It’s a story that we, as women, are all too familiar with: we are forced to choose between taking a pill composed of synthetic hormones causing unwanted physical and emotional side effects or, we have to rigorously chart our fertility cycle making calculations. This is an anxiety inducing decision, worrying if we have recorded everything just right.

Both options have long had significant drawbacks- and neither option is practical for a modern day woman focusing on living an active and healthy lifestyle.

Introducing Daysy: The digital fertility cycle monitor with the simple color coding system.


Daysy will help you to...

... bring spontaneity to your love life
... take control of your health
... begin to know and trust in your body’s natural rhythms
... eliminate the use of harmful, hormone-based birth control methods
... restore your body to optimal health
... prevent unwanted pregnancies with an accuracy rate of 99.3%
... plan for a baby when the time is right for you

The Daysy Fertility Cycle Monitor is as easy as 1,2,3...

Just 30 seconds once a day

  1. Each 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.

It’s truly that simple! Be empowered! Choose Daysy.

I love Daysy so much! I am thankful for this technology because birth control pills were just no longer an option for me. I have felt healthier and more in control of my own femininity. Daysy is worth every cent and more to me! - Erin Hollier, freelance writer




Daysy is a simple, easy-to-use medical device that was developed by women for women because we saw a need in the market for a hormone-free fertility cycle management solution which is easy to use, effective and minimizes user errors.

We recognize that today’s women live busy lives and might not have the time or patience for traditional fertility awareness methods. There’s no need to study natural family planning or become an expert on mucus analysis!


With Daysy you can start today and, in just 30 seconds each morning, you’re on your way to natural, healthy control of your own fertility.  

Daysy: Wake-up. Measure. Done!!

Daysy is Accurate.


Daysy is 99.3% accurate, an achievement that is the result of over 30 years of work by a team of gynecologists, fertility experts, software specialists and electronic engineers who analyzed over 5 million female cycles to develop and perfect the Daysy algorithm.

Since its release in May of 2014, thousands of women have used The Daysy Fertility Cycle Calculator and the accompanying app, DaysyView to manage their family planning.

The Benefits of Daysy

Choose Daysy and enjoy...

  • No side effects. Not now and not in future. Daysy is completely hormone free.
  • It’s super easy to use. Wake-up, measure, done!
  • No charting required. No more guessing.  Daysy does all the work for you.
  • Learn to trust your body and be in tune with who you really are.
  • Be in control of your body and your health. 
  • Understand your cycle, understand your data, understand yourself.
  • Highly accurate predictions lallow you to plan your life better.
  • One time purchase to manage either baby planning or prevention.  
  • Condom-free sex really is the best.

Are you ready for easy and natural family planning with NO hormones and NO charts?





Here's what women are saying about Daysy...


Daysy is a convenient and reliable alternative to all of the hormonal birth control options out there. I strive to respect and understand my body and Daysy allows me to do just that. I know that I am not negatively impacting or confusing my body with hormones which often has long-term consequences and I don't have to be bothered with cumbersome and unreliable barrier methods anymore. And, let's face it, the tech-loving-girl that I am appreciates the graphs and charts on Daysy. Birth control? There's an app for that! I love my Daysy.   -Erin Hollier,  freelance writer

Daysy is so easy to use and what you get out of it is this wealth of information about your body. I now know the rhythms and the health of my body, no guessing. I love Daysy and have told all my friends about it. - Mari, Teacher.

[Daysy] is a useful tool that has helped my husband and I grow together by learning about my cycle. I would highly recommend it as a better way to approach family planning. It is easy to use.  - Leda Wolk, private chef

I love that [Daysy is]  hormone free, which means a healthy way to manage my cycle. I used to be on the pill and once I realized how bad it was for me I immediately switched. I always tell my friends that the Daysy helps me understand my body and feel more connected to my cycle instead of thinking [of] it as a separate part of me. - Brie Richardson, senior marketing coordinator

Daysy is a safe alternative to taking birth control (hormone) pills. I took birth control for 6 years and imagine how much harm I did to my body in that time. Just think about the huge rise we have seen in hormonal cancers and fertility problems. I was nervous about using the Daysy but it becomes a part of your life and it's easy to use.- Sydney Kerlin, student

I would definitely recommend [Daysy]. Birth control negatively messed with my hormones and did the same with so many other women I know. It is not natural to take hormones to prevent pregnancy. I'm so happy there's Daysy where I can naturally prevent pregnancy without ANY side effects!

Highly recommend Daysy because it is hormone-free, easy to use, and is backed up by awesome customer service.   - Lisa, student

I would absolutely recommend [Daysy]. I love Daysy and how easy it is to use, plus the tracking makes it simple to show my doctor how things are going. My husband and I are both very concerned about the effects of hormonal birth control, but don't want to throw caution to the wind. Daysy makes it easy for us to monitor fertility together, without all the side effects of HBC [hormone birth control]  - Lauren Halcik, HR Director

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 highly recommend Daysy. It's great to be off unnatural medication that is not good for my body. It is just as effective as the pill, as I have been avoiding pregnancy for 7 months now with no problem. When I do decide to have kids it will be very helpful at that time as well. The investment is well worth it in the long run. The device is easy to use and the app makes it easy to see all your data. - anonymous

It's the best birth control if you don't want to put hormones in your body.
- Kathrin, student


Get free cycle analysis and printouts at any time. By sending our team your data from daysyView you can obtain free cycle analyses and reports for your review. Get free suggestions on cycle regulations and healthy lifestyle tips. We will support you with any questions you may have.


Who should use Daysy?

  • Women who are sick and tired of conventional birth control methods.
  • Women who want to use a completely natural birth control method.
  • Women who do not want to take artificial hormones for birth control.
  • Couples who want to conceive. 
  • Women who want to be in tune with their body and soul.
  • Women who have suffered the side effects of hormone-based birth control.
  • Women who are breasfeeding.
  • Women who have medical conditions that prevent them from using hormone-based birth control including:
    • many cancers
    • diabetes
    • high blood pressure
    • liver disease
    • low libido
    • migraine
    • depression
    • risk of thromboses
    • thyroid dysfunction
    • weakened immune system

The truth is, that ANYONE can use Daysy to plan or prevent pregnancy! Daysy is THE choice for safe, easy-to-use, hormone-free natural family planning.


Price & Guarantee

  • Daysy is now available for only $330 assuming a price of $18 per month for birth control pills, the return on the Daysy investment is only 1.5 years!
  • Many HSA and FSA health plans cover at least part of the cost - check your plan!
  • Each Daysy comes with a 2-year, limited Manufacturer’s Warranty AND
  • An unconditional Money Back Guarantee! If you aren’t completely satisfied with your Daysy, return to us within 14 days for a full refund.

Are you ready for easy and natural family planning with NO hormones and NO charts?

Get empowered! Choose Daysy.


I highly recommend Daysy, it has been one of the best investments. If something goes wrong customer service is there to help you and Daysy is easy to use. Also in the long run it'll save you money on condoms since you'll know your fertility. - Liliana, Nail artist.




Valley Electronics AG 

Europe’s Leader in Natural Fertility for Over 30 Years

A leader in natural fertility for over 30 years, Valley Electronics AG has perfected its method and algorithm to successfully track and predict a woman’s menstrual cycle including those days when she is most and least likely to be fertile. Daysy, introduced to the market in 2014, is Valley Electronics' latest technology which blends years of experience with research and today’s sophisticated technology to provide the contemporary woman with both ease and accuracy in a natural fertility monitor.

Valley Electronics' team of gynecologists, fertility experts, software engineers and electronic engineers have worked collaboratively analyzing the menstrual cycles of over 5 million cycles. Lady-Comp, the firm’s premier natural fertility product for the last decade, has provided an unparalleled depth of research and experience that is now leveraged into Daysy - an easy-to-use fertility monitor for today’s sophisticated woman.

A personal note from the creator of Daysy


CEO-Natalie Rechberg-Egly Hi, I’m Natalie Rechberg, founder of Daysy.

I grew up immersed in natural fertility management because my father was the founder of Lady-Comp, a leading tool in natural family planning for over 30 years.  Even though I spent my entire life in this environment,  I followed the trends my friends followed and tried different birth control methods at an early age. I learned fast that, for my body, this wasn’t such a good idea. Like so many women, I suffered side-effects from hormone-based birth control options, including significant weight gain and cellulite. My experience taught me that natural birth control was right for me, so I went back to using the Lady-Comp.

From this time forward, I immersed myself in natural fertility management and have become a sought-after expert in woman's natural menstrual cycles. I also trained as a yoga instructor and deepened my studies in health and wellness for women.

Today, I am a menstrual cycle geek!  I created Daysy for those women who are sick and tired of hormonal birth control but find traditional natural methods too complicated for their busy lives. Daysy leverages 30 years of experience and research along with the latests technologies to help women safely and confidently manage their fertility for both planning and preventing pregnancy.

Get Daysy and enjoy the modern freedoms of natural birth control!


Buy Now