Home – New2020-12-05T09:07:04+10:00

incl free DaysyView app
and FREE SHIPPING within Aus & NZ

Daysy empowers you!

Daysy is an intelligent fertility tracker that lets you get to know your very own menstrual cycle. Thanks to Daysy, you know exactly when you are in your fertile window and when you are not.

During your fertile window you can choose to plan a pregnancy, during your infertile phase you can not. It’s your choice.

Daysy calculates your fertile window: Your fertility status will be displayed either as a red (you are fertile / possible fertile) or green (you are not fertile) light.


Daysy is an intelligent fertility tracker that lets you get to know your very own menstrual cycle.

As easy as 1, 2, 3…

Only about 60 seconds per day!

Every morning when you wake up, you measure your temperature under your tongue.

Enter if you have your menstruation.

Daysy evaluates your data and shows you if you are fertile or not for the next 24 hours.


“I’ve been using this beauty for a little while now and I absolutely love it.
It gives me more confidence in tracking my cycle…..

This is something every woman should have. I only wish I had it sooner. It’s empowering to be more in the know and in control of what’s going on in your body.”

Tegan Steele

“Highly recommend Daysy because it is natural, easy to use, and is backed up by awesome customer service.”


“It helps me keep track of my period and when I may be ovulating”



incl free DaysyView app
and FREE SHIPPING within Aus & NZ



or 4 fortnightly payments of $124.85 with Afterpay More info

You can count on Daysy!

Why is Daysy so reliable?

Due to an intelligent algorithm based on scientific evidence, long-term experience and well-engineered technology, Daysy provides highest quality, reliability and precision in terms of fertility tracking.

Daysy determines your fertile and infertile phase using an extensive database and proprietary algorithm. Based on 5 million menstrual cycles and an algorithm that draws on knowledge from more than 30 years of research, including several studies, Daysy fertility tracker can give you reliable information about your menstrual cycle and fertility.

You can start your temperature measurement with Daysy fertility tracker on any day of your cycle. Our customers appreciate the fact that measurement and the menstrual cycle indicators can be seen independently of smartphone integration. Connecting to your smartphone is relevant for details and special features, e.g. if you want to display your menstrual cycle history or share it with your partner or doctor.

Daysy’s algorithm, which is also used by the well-known Lady-Comp fertility menstrual cycle tracker of the parent company, has proven its reliability  for more than 3 decades. Join the Daysy family and see how exciting it is to get to know your body better with Daysy fertility tracker!


Discover DaysyView!

How exactly does the Daysy fertility tracker work?

Daysy uses a proven algorithm and the morning measurement of your basal body temperature to calculate the daily menstrual cycle status in real time. Just measure your temperature under your tongue in the morning and then Daysy will display if you are in your fertile phase or not using red or green indicator lights.

The technology-based temperature method used by Daysy is one of the most reliable methods in the world for fertility tracking.

In addition, Daysy records your menstrual cycle and ovulation history and DaysyView displays your past and present cycle data. It is hardly easier to become aware of your body.

Daysy is a medical device and lifestyle fertility tracker. Daysy allows women who want a health-conscious lifestyle to monitor their individual monthly cycle and determine fertile and infertile days in natural harmony with their body.

Note: Daysy’s algorithms work best with cycles from 19-40 days. If your cycle fluctuates more than 4 days or your cycle length is outside the 19-40 day range please contact us to see if Daysy is right for you.

Get Daysy Now!

The Daysy Guide To Your Hormones

Daysy can give you insight into your fertility, hormones, and health. With this guide, we hope to share a good overview of the science behind the red, green, and yellow lights, and support you in gaining the knowledge you deserve, to use Daysy as a powerful tool for self-understanding and empowered decision-making. Whether you’re just starting out with Daysy or a longtime cycle tracker, this guide will provide evidence-based answers to the central questions we discuss every day with our users.



How does the instalment program work?2020-10-05T14:17:29+10:00


At checkout, select Afterpay as the payment method.

Simply complete your checkout. No long forms, instant approval decision online.

Pay over four simple instalments. Pay every 2 weeks, enjoy your purchase right away.

All you need to apply is to have a debit or credit card, to be over 18 years of age, and to be a resident of Australia.

Late fees and additional eligibility criteria apply.  The first payment may be due at the time of purchase. For complete terms visit https://www.afterpay.com/terms

New Zealand

At checkout select Partial.ly Payment Plan as the payment method.

You will be sent to the Partial.ly website to create your account if you do not already have one.

For more information visit: https://support.partial.ly/tag/customer/


Can I pay by instalments?2020-10-05T14:17:29+10:00

Yes. We have an instalment payment program available through AfterPay (Australia only) and  Partial.ly (New Zealand only). For more information click here: https://daysy.com.au/faq-items/how-does-the-instalment-program-work/.

How long does shipping take?2020-10-05T14:17:29+10:00

Generally, Daysy will arrive in 2-4 business days.

How long does it take Daysy to reliably “learn” my cycle?2020-10-05T14:16:26+10:00

Generally, we say that the Daysy has a learning phase of 3 to 4 cycles. This does not mean, however, that you will not get any green lights (infertile days) during that time. Daysy will start out very conservatively and base your fertile window primarily on statistical data and statistically you could ovulate as early as day 11, causing Daysy to start your red (fertile) days around day 6 or 7 depending on how long your menstruation was. It will then stay red until ovulation has been confirmed, at which point it will change to green light indicating infertile. Over the course of the next several cycles, Daysy will begin to weigh your data more heavily against the statistical data and slowly narrow down and give less red days as it is able to pinpoint your individual fertile window.

Who developed Daysy?2020-10-05T14:16:26+10:00

Daysy was developed by Natalie Rechberg, CEO of Valley Electronics AG in Switzerland, and daughter of Dr. Hubertus Rechberg, creator of the world-known Lady-Comp. Daysy uses the same core technology and algorithms used by Lady-Comp, and adds its own personality with the use of daysyView. The electronic brain, containing knowledge about fertility, and other components are manufactured by leading suppliers from all over the globe. Daysy is a certified medical device after standard EN ISO 13485:2012.

At what age can I begin using Daysy?2020-10-05T14:16:27+10:00

Generally, Daysy can be used once you get to a sexually mature age. Daysy needs consistent use to be effective and does not protect against sexually transmitted diseases.

Payment Options

Pay your new Daysy off from as little as $124.85 a fortnight (conditions apply).


Flat Rate Shipping

Get your Daysy delivered anywhere in Australia for just $20!


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