Natural family planning for women ready to take matters into their own hands
Meet your new best pal, Daysy
Planning pregnancy? Postponing pregnancy?
Daysy’s got you through it all.
Your fertility is serious business. You deserve only the best.
“The only thing that saddens me is that I didn’t discover it years ago”
...and more reviews from happy Daysy users
Find out why 99% of Daysy users would recommend Daysy to a friend.
After using Daysy for several years alongside my own charts (just for fun, because I'm nerdy enough to find chart-making fun), I’ve never had so much as a "scare." Plus, seeing how its calculations always align with my own, I feel confident enough to keep using it. I’ve had great results relying on Daysy for both contraception and achieving two pregnancies. It takes about 30 seconds of my day and I am happy knowing I’m not messing with my hormones. After about five years of using my Daysy, I couldn’t be happier with it. It’s easy to use, it doesn’t turn me into a jerk, and it works. That’s really all I want from a birth control method, and, so far, Daysy delivers.
So much more than a period tracking app
Get pregnant faster
Skip the stress, self-doubt, and months of waiting and wondering.
Track your fertility daily with Daysy and learn if you’re ovulating,
if you have regular cycles, and exactly which days are best for conception.
In a survey of Daysy users, 63% reported they conceived the first cycle they tried. And 89% reported they conceived within just 3 months with Daysy.
I love Daysy: I have used the Daysy for 4 years now. I was not sure at first but felt like hormonal birth control was no longer for me. I am so grateful I gave Daysy a shot. I was able to avoid pregnancy when I wanted and I was able to get pregnant right when I wanted two different times. I can’t say enough positive things about it. It’s easy to use, accurate and the staff is great with any questions. I would definitely recommend this product.
To prevent and then plan pregnancy! I used Daysy for over a year to prevent pregnancy, and after the year we wanted to try for a baby. With the help of Daysy we conceived immediately and now I am 12 weeks along! I cannot recommend it highly enough
Got a period? You can use Daysy.
See how our cycle trackers stack up
| Lady-Comp | Daysy | Other period trackers |
|---|---|---|
| 99.4% accurate | 99.4% accurate | 93% accurate |
| No app needed | Works without an app | Needs both a thermometer and app |
| One-time purchase, no hidden costs (payment plans available!) | One-time purchase, no hidden costs (payment plans available!) | $9.99+ monthly subscription |
| Works offline | Bluetooth only on demand | Needs wifi to display fertility status |
| Reliable algorithm that works with irregular cycles | Reliable algorithm that works with irregular cycles | Algorithm uses AI to fill in the gaps |
| Long battery life | Long battery life | Needs phone charger |
| Backlit display | Lights up with fertility status | No backlit display |
| Sensitive sensor that measures to the hundredth of a degree | Sensitive sensor that measures to the hundredth of a degree | Sensor only measures to the tenth of a degree |
| Detects hormonal deficiencies | - | - |
| Shows expected delivery date | - | - |
So many ways to save
Hear from more happy Daysy users
Absolutely love it: I’ve been using Daysy for two years now and absolutely love it!! It’s so easy to use, I love the lights that flash according to your fertility status.
I’ve gone 3 months without needing to charge it! Daysy has been super accurate with everything so I confidently use it to avoid pregnancy, once I start that chapter of my life it’ll also be nice to use daysy to actually aid in conceiving. I love how it stores my temperature and then saves it on my daysy app once connected without needing to enter it manually. It’s a bit of an investment up front but you have 0 monthly fees and they’re their customer service is extremely helpful! I highly recommend daysy to any woman who would like an alternative to hormonal birth control.
You don’t have to measure at the same time everyday - plus more answers to smart questions about Daysy
For optimal use of Daysy, we recommend that you should have slept sufficiently (at least one hour) before the measurement. It is important that you take your temperature immediately after waking up, before getting up and becoming active. Measure below your tongue, with your mouth closed, and keep the device steady while it is measuring. Video Tutorial
No. You should have at least one hour of good quality sleep before the measurement. It is important that you take your temperature immediately after waking up, before getting up and becoming active. For optimal use of Daysy, try to get at least 3 or more hours of sleep before measuring. Less sleep can result in more temperature fluctuations causing Daysy to give more fertile or potentially fertile days.
You can confirm or remove menstruation at any time during the current day. Simply press the button to turn on your Daysy, and then press and hold the activation button until the violet light lights up without flashing and you hear a "beep." Confirm you are menstruating for each day of active bleeding and for a minimum of three consecutive days. You can also remove menstruation data for the same day by turning Daysy on and pressing and holding the activation button until the purple/blue light is no longer solidly lit and begins flashing again.
The first 2-4 cycles of use are considered Daysy's learning phase. Over the course of her learning phase, Daysy will come to understand your cycle and begin narrowing down your fertile window. Daysy remains quite cautious and conservative during this time, which is why Daysy is accurate starting the very first day.
You can rely on Daysy's results starting the very first day of use. In the beginning, you will see more yellow and red days because Daysy is still learning your unique cycle. You will see more green days as Daysy comes to understand your cycle and can narrow down your fertile window. The more regularly you measure, the better.
Yes. Irregular cycles are not a problem for Daysy/Lady-Comp. Even with irregular cycles, all Valley devices distinguish between non-fertile and fertile days with a very high accuracy. However, in case of extreme fluctuations between cycles it will give you more red and yellow lights and less green lights. Fluctuations of several days are usually not a problem. If you have questions about your unique cycle, please reach out to our team of experts.
No! DaysyDay is free! There are no in-app purchases or upgrade fees.
In general, you should skip measurements during illness and while you are taking medication that can have an influence on your body temperature or cycle. If you have doubts, contact your doctor or our customer service team.