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.
Usa Daysy (usa.daysy.me) has a 4.0 out of 5 rating on OK.one, based on 100 user reviews collected here. It is listed under Health & Medical and its reputation is good. 73% of reviews are 4 stars or higher and 18% are 1 star; The business has replied to 87% of negative reviews. Last updated 2026-09-05.
Not easy to use. Very disappointed. Very frustrating. Wish that I could return it but it is past the window. I didn’t open it right away due to a busy life hahahaa so by the time I realized that this product was a waste for me it was too late. Oh well!
Hi Michelle, If you'd like to email us at [email protected], we'll be happy to get you on track with Daysy so that you may use your device as you originally intended.
Beautiful app that is super easy to use!
Thanks so much, Elizabeth!
Love this device!
Thank you, Katie!
I have been using this method for three months and they are always yellow days, I once had red days and now I am pregnant and the slide never bites the three lights that indock it. I want my money back
Hi Lina, Yellow and red days are fertile/possibly fertile days. If you'd like to email us at [email protected], we'll be happy to do a fertility analysis for you.
I've really enjoyed that Daysy automatically stores my temperature. And that's honestly the only up side in comparison to Natural Cycles. I've been using both only because Natural Cycles uses a basic thermometer (to the correct decimal) and is difficult to manually record my temp from. These are the perks I wish Daysy had that Natural Cycles does: - Take LH test into account. My ovulation date is still jumping around a bit (as opposed to Nat. Cycles) because I can't give it this information. - Easily exclude a temperature later if you realize you didn't sleep well, feel sick, or are hung over. It can cause irregular measuring if I skip measuring for these reasons and get out of a rhythm. - Automatically sync data to the cloud: it can be annoying to sync when it fails several times. (Not applicable to Nat. Cycles). - Show more data on the trend overview instead of requiring the user to scroll. (Rotate to landscape). - Have alerts for things from "you're going to start PMSing" and "It's time to do a manual breast exam" to educational posts about how a woman's cycle works and how the app is calculating things. - Record things like PMS, mood, and sex drive.
Hi Justine, Thank you for your feedback. We will pass it along to our development team.
Even though it has ONE button. It’s hard to make it work, there are days that I would think it recorded my temperature and it wouldn’t. Disappointed since I paid a pricey cost.
Hi Jessica, If you'd like to reach out to us at [email protected], we'll be happy to walk you through how to use Daysy and answer any questions you may have.
Very easy to use and manageable to adopt in your morning routine!
Thanks so much, Melina!
Daysy has been wonderful! Customer service was quick to reply to any questions I had before ordering. The Daysy it’s self is easy to use and so is the app.
Thank you, Kyele!
Not a fan of Daysey at all. I wish there was a way to get a full refund.
Hi Amber, We're sorry to hear this. Please don't hesitate to email us at [email protected] if we can help to resolve any questions or concerns you may have.
Daysy is a life changing. My husband and I were able to plan our pregnancy.
Thank you, Gen! We love hearing this!
I LOVE using my Daysy. After horrible experiences with hormonal birth control, I decided to switch to Daysy. I love that I can take my temperature after 3-4 hours of sleep, and it doesn’t have to be at the same time of day every day. The only thing that was unfortunate was that I had a positive test for pregnancy long before my Daysy noticed or acknowledged. I figured it would have been able to tell me sooner than it did.
Hi Moriah, Thank you! It typically takes around 15 days post ovulation for Daysy to see that the cycle is not following a typical trajectory and is more indicative of a pregnancy. Please do not ever hesitate to contact us if you have any questions or concerns!
Daysy has the best customer service! They are always very quick to respond to any issues. I’ve been using Daysy for three years since I got off the pill. My first Daysy got damaged and they sent me another one in the newer version as soon as I sent the old one in. Highly recommend!
Thank you, Dillon!
Your product doesn't allow you to go back to revise menstruation data if it has been 3 days since the entry. This makes it extremely frustrating if you've already logged multiple months of data, and now have to do a factory reset in order for Daysy to accurately track your cycle. I have contacted Daysy about this issue, and have not been given any way to fix this issue without reseting the device and starting its tracking from day 1. I haven't found any cases online of other customers who have been able to resolve this issue either.
Hi Rima, Yes, this is a security feature of Daysy so the amount of data that could potentially be altered by an unauthorized person is minimized. Please email us at [email protected], and we'll be happy to help you get back on track!
It never worked and I wasn't able to get a refund for it. I was very disappointed with the daysy.
Hi Sylvia, If you would like to email us at [email protected], we'll be happy to help you get back on track with Daysy so that you may use Daysy as you originally intended.
I have had an absolutely horrible experience with daisy. Daysy didn't work, is not worth the money and the customer service is horrible! I tried to make contact with daysy to troubleshoot and they were not willing to help me, would not give me a refund for my defective product and insisted on emailing me rather than calling me. Needless to say, I'm extremely frustrated to have a defective product that I paid hundreds of dollars for.
Hello, We're sorry to hear you're so frustrated. We wrote to you 3 months ago to assist in troubleshooting and never received a response. We would be more than happy to set up a time for a phone call at your convenience if that's easier for you. Our team will reach out to facilitate next steps.
I couldn’t make it work and I should have reached out for help to fix it but I was just trying to cope with my miscarriage I never made the time
Hi Andrea, We are so sorry to hear of your miscarriage. Please know you can reach out to us at any time. We are happy to support you however we can. Our email is [email protected]. We hope to hear from you soon.
Always so patient and helpful with any request, concern, or question.
So happy to hear this. Thank you, Kelsey.
The item did not work for me and They have refused to give me my money back.
Hi Stefanie, I'm not sure where you're located or why Daysy didn't work for you, but if you'd like to email us at [email protected], we'll be happy to help you so that the goals you had when you made the purchase can be met.
At first nervous to try this method, but the reults have been great. Short history of myself, I was having some issues accepting different types of birth control, so I then decided to use the dasysy and I have noticed a huge improvement in my overall mental/emotional and physical health. Highly recommend for those with doubts.
Thank you, Karla!
Keeps getting better with prediction with time
Yes, it does! Thank you, Maria!
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