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What is the Daysy fertility tracker?

Daysy is part basal thermometer and part app. Daysy is a small device that you use to take your temperature the moment you wake up orally. Based on your temperature reading, you will receive feedback on whether or not you’re fertile. That morning reading is your fertility status for the next 24 hours.

From there, you and your partner can determine the best course of action for the day based on your intention – to get pregnant or to prevent pregnancy.

What makes Daysy different from other thermometers is that it has a built-in algorithm to learn your cycle and you will begin to see more customized readings the longer you’ve used it. 

Bottom line: by consistently using Daysy over a more extended period, Daysy will start to predict when you’re fertile and ovulating, and when you’re not.

Learn more about the Daysy fertility tracker!

Check out my video review

2019 update: Daysy 2.0 released!

As of late March 2019, Daysy 2.0 will be replacing the original Daysy outlined in this post. I was fortunate enough to test out Daysy 2.0 before she hit the market, and let me tell you, I’m thrilled with her new updates!

Here’s what you can expect with Daysy 2.0:

  • Bluetooth capabilities (no more plugging Daysy into your phone to sync data)
  • A rechargeable battery
  • The ability to edit menstruation input via the button on Daysy
  • More robust housing and a flexible neck

In addition to the updates on the physical Daysy, the app has received a beautiful refresh that promotes ease of use and more accessible data about your cycles. And of course, use my daysy discount code and save 25% on your order.

Already have a Daysy but want to upgrade? Contact customer service for the most current trade-in offers.

Daysy fits in the palm of your hand.

How to use Daysy

Like I mentioned above, it is imperative to use Daysy right when you wake up after a night of at least four hours of consecutive sleep. Not after you get up to go to the bathroom, not after you check your phone, not after you kiss your partner good morning.

The reason why the timing is so crucial is that Daysy measures your body’s resting temperature, and that number should be captured in its most natural state to ensure the most accurate reading.

Also, if you are menstruating that day, make sure to let your Daysy know by holding down the center button until the small purple square pops up. That is essential data for your Daysy to identify and will affect how she learns your cycles.

After you take your morning reading, which takes about thirty seconds, your Daysy light will turn either red, yellow, or green.

  • Red: you are fertile, use an additional barrier method to prevent pregnancy. We prefer these super-thin vegan condoms.
  • Yellow: handle these days like red days; they mean that Daysy is experiencing cycle variations and is still learning your cycle.
  • Green: you are not fertile and can enjoy sex with your partner without another method of protection.

From there, you can choose to sync your daily reading to the Daysy app to chart out your temperature and cycle changes. I sync to the app every few days!

Again, it takes about three months for Daysy to learn your cycles, so don’t get discouraged if you see a lot of red and yellow days pop up over the first ninety days. It’s essential to make sure your partner is on the same page as you throughout this process!

daysy discount code and review

Is Daysy effective?

Yes! Daysy is effective.

It’s important to note that Daysy is a fertility calculator vs. a traditional birth control like the pill. With Daysy, there are no synthetic hormones, chemicals, or unwanted side-effects and full control over whether or not you’d like to try for a baby within a moment’s notice.

Read more about Daysy and traditional birth control methods for even more insight into the differences.

Should you decide to begin a family, Daysy can be used to chart out your most fertile days and give you more insight into when the potential for pregnancy is at its highest. Rest assured that the Daysy effectiveness is definitely in your favor.

daysy app fertility chart
daysy fertility tracker app fertile days

What I love about Daysy

  • 100% natural – there are no synthetic hormones or medicine of any kind
  • Empowers me to reconnect with my body’s natural cycles
  • One-time payment vs. monthly prescription bills (like when I was on the NuvaRing)
  • Super user friendly and easy to use
  • Easy to figure out whether you’re fertile or not
  • Varying settings in the app depending on if you’re trying to get pregnant or not

What I don’t love about Daysy

  • Remembering to take my temperature immediately upon waking up (I’ve started placing it on top of my phone to remind me to do it first thing)
  • No Bluetooth syncing. You do have to plug it into your phone (with the extension piece for iPhone 7 and above), but it’s really not that complicated Update: Bluetooth capability has been added for Daysy 2.0 as of March 2019!
  • Remaining patient throughout the learning cycle

My final thoughts on Daysy

The Daysy fertility tracker is hands-down my favorite birth control method to date. Just make sure to use condoms (we love these!) on red and yellow days if you aren’t trying for a baby!

It has empowered me to take back control of my own body and begin to understand how I feel without synthetic hormones. I feel confident and secure while using Daysy, and it has opened up my relationship to some essential topics, including how I’m feeling during different phases of my cycle.

If you’re considering changing your hormonal birth control, Daysy might just be the right choice for you. Please note, I do suggest working with a functional doctor or midwife while navigating the transition from hormonal to non-hormonal birth control, as this experience can be different for everyone.

using daysy discount code

Use my Daysy discount code and save

You can save 25% on your Daysy by merely clicking the button below! The discount will reflect in your shopping cart.


Daysy is genuinely one of the best investments I’ve made in my health. She allows me to feel empowered and secure in my sexual wellness. The physical changes (more energy, less anxious feelings, no more brain fog)

I’ve felt in just a few weeks from choosing Daysy over my IUD is so incredibly eye-opening and worth every penny.

Do you still have a question?

If you still have a question I didn’t address in this post, ask it below! I will do my best to help you get the answers you’re seeking.

A note from Carley

Please know that my experiences are simply that, my experiences.

I believe women should choose a birth control method that works correctly for their bodies and realize that Daysy might not be the right choice for everyone. Thankfully, it was for me!

This post contains affiliate links. We may receive a small commission for purchases made through these links. Thank you for your support!


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  1. […] My Daysy Review: The Fertility and Ovulation Monitor I Always Wanted […]

  2. Erika says:

    Hi I’m Erika. I have been using a copper IUD for about 3 years. I will like to start using Daysy. I was wondering if I could use both methods for the first 90 days while Daysy learns my cycles. I’m kind freaking out about getting pregnant so I want to be as safe as possible. Will the copper IUD interfere with my temperature and the reading???

    • CARLEY says:

      Hey Erika!

      I’ll give you my opinion as someone who had an IUD and switched to Daysy. Personally, I wouldn’t. I’d wait to start Daysy once your IUD has been removed (should you choose to get it removed) so Daysy has a chance to learn your natural cycles without interference of any kind. Keep in mind, Daysy is effective when used correctly, so just make sure to use condoms on the days you’re red or orange and follow her prompts! If you’re still concerned or curious, you can email Daysy at info(at) to ask what they’d recommend! 🙂

      Hope this helps! xx

  3. Cin says:

    I’m a little on the fence on buying this, because it’s so darn expensive ????????
    And I’ve been curious to know if I when I buy it? Should i start using it when i get my IUD removed. Because I’ve had it on for 2 years now and haven’t gotten a period at all. Should i just wait until my cycle begins?

    • CARLEY says:


      I totally get the hesitation around price. Be sure to check with your insurance company as the Daysy could be covered up to 60%! As far as when to start using it, I personally started using it as soon as my IUD was removed but note that your first “period” off of birth-control is just your withdrawal bleed so you don’t need to tell your Daysy it was a true period. According to Daysy, “The first bleeding after coming off hormonal birth control is a withdrawal bleeding and must not be entered as your period. Please make sure your first menstruation entry is on the first day of active bleeding and flow.”

      Hope this helps!

  4. Brittany Davis says:

    How long have you been using the Daysy?

  5. Chloe says:

    Does the Daysy actually tell you your BBT? Or just that you are or aren’t ovulating?

    • CARLEY says:

      Hi Chloe! Daysy will tell you your daily BBT and use her unique algorithm to predict your daily fertility status. Hope that helps!

  6. Wendy says:

    I really appreciate your useful and very persuasive explanation!!! When my teenage daughter was ready to become sexually active with her boyfriend, she begged me to let her go on the pill. Instead I taught her the basics of FAM and bought a fertility monitor for her. At first she was terrified by the idea of having unprotected sex and really worried about getting pregnant in high school, but websites like yours helped me to persuade her that FAM is much better birth control than condoms or the pill. Giving her an introduction to FAM before her first time with her boyfriend was also a great mother-daughter experience for us and really was what gave her the the little push she needed to get over her shyness about her body and become sexually active. She now is completely comfortable having unprotected sex with her boyfriend on her “green” days, and she promises me they are super careful with any kind of P-in-V on her “red” days. This may not work with all teens, but they are both straight-A students and really responsible, and I can tell FAM has really strengthened their relationship. You are a great role model for responsible teens!

    • CARLEY says:

      Wow – that is such a fantastic story! I love the openness you share with your daughter, and what you taught her is so invaluable. Thank you for your kind words, and I’m glad that FAM and fertility monitoring is working out!

      xo –

  7. Wendy says:

    Thanks, Carley. I can’t emphasize enough how important it is to help your daughter develop a healthy life plan for her sexuality and fertility while she still has the support and guidance of living with mom at home. So many girls stumble into sex confused and uncertain and conflicted. It was really important to me that my daughter should have a more positive experience. Once she began dating her boyfriend, I didn’t wait for her to come to me about sex — I raised the topic with her first. At first she insisted she was too young to begin having sex and that she “never” wanted to have children. I insisted that she start using Daysy and learning FAM anyway, and that was the pathway for me to persuade her to become sexually active and not to use condoms or the pill. It took several months of discussions with her, but when she finally had her first sexual experience with her boyfriend, it was planned, it was safe, it was with my encouragement (the rest of our family went out for pizza and a movie that night, so her first time could be in her bedroom), and it was without any barrier or hormonal contraception.
    Practicing responsible FAM has really formed a strong bond between my daughter and her boyfriend, and I can see that she is increasingly accepting of her fertility as the next step in expressing their intimacy. As you say, Daysy gives my daughter “full control over whether or not you’d like to try for a baby within a moments notice.” His mom and I have discussed their relationship and are ready and supportive for them to take that next step. My daughter is in her senior year of high school now, and he is a freshman in the local college, and she and I have discussed several times the special magic of “red day” sex both physically because of her heightened responsiveness when she is fertile and emotionally as a true expression of both partners being open to the possibility of making a baby together. Educating her that most women don’t get pregnant the first time they “try” to get pregnant and that almost all women need at least a few months to get pregnant has definitely increased her receptiveness to being intimate with her boyfriend on her “red” days. I am really looking forward to when they begin using FAM for TTC instead of TTA.

    • Wendy,

      That is wonderful! I completely agree with you that sexual health education is extremely important, especially for young people. I really appreciate you sharing your experience.


  8. Katinka says:

    Hello and thank you for your support. My question is :
    You can use this only if you have iphone 7 and above?
    I have samsung , is that mean I can not use Daysy because there are no application for it? Thank you!

    • Hi Katinka!

      Thank you so much for asking. This is a great question!

      There is an app on the Google Play Store called “DaysyView”, so I believe you should be able to use Daysy with your Samsung phone. 🙂


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