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 378 customer reviews on Five Star Index, with an average rating of 4.0 out of 5.
Also known as
usa.daysy.me
Website
usa.daysy.me
Category
Pharmacy & Medicine
Listed on Five Star Index
2026
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The company replied to 96% of reviews.
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Most recent review: April 2025.
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My daysy is brand new and won't sync- says that somehow the device is already being used with another account? But this is my first time setting everything up. Customer service won't get back to me, I'm not sure what to do if the app won't work. It's 2/3 of the reason I bought this device.
Response from Usa DaysyNov 12, 2018
Hi Bree, Our customer support team is very responsive and has been working all weekend. Unfortunately, I do not see an email from you in our ticketing system. If you'd please email us again at [email protected], we'll be happy to assist you. Most synchronization issues can be resolved within minutes. We look forward to hearing from you!
JU
Juliana
The product never worked
The product never worked. It was very dissappointing.
Response from Usa DaysyAug 6, 2018
Hi Juliana, We're sorry to hear you were disappointed. I will reach out to you directly to see how we can assist you.
TO
Toni
I did like daysy for a while but it…
I did like daysy for a while but it split at the seam a few months ago - it was covered by the warranty & they sent me a new one (after I paid for shipping both ways) but now the new one has the same problem. I don’t know if I can trust it’s readings like this. It’s pretty frustrating. I guess I can still send it back & receive a new one but this seems like a consistent problem & I don’t think they are changing the design or doing anything to address it (it seems like a battery problem). I’m also not happy with the lack of education the company provides about your own chart. It’s as if they just want you to take their word for it but my ovulation day is never when they “say” it is & then once I finish my menstruation they go back to change it. Having to interpret my readings myself as well as the battery malfunction, I regret this very expensive purchase.
Response from Usa DaysyAug 6, 2018
Hi Toni, We're very sorry to hear this. I can assure you that we are aware of this issue and have taken significant steps to be sure it is addressed immediately for our current customers and permanently going forward. Regarding ovulation...each cycle, Daysy predicts when ovulation will occur, but this is only a prediction. Once you are 4-5 days into your next cycle, Daysy goes back, analyzes your previous cycle in its entirety, and confirms where ovulation actually occurred. Otherwise, you can follow the daily fertility indicators given to you each day. We are always happy to provide a fertility analysis as needed. I will reach out to you directly to see if we can address your concerns.
GR
Grace
App isn't good.
Great for accurate readings recorded, not great for synching with your phone and learning more about your cycles and fertility or adding further info to the records of your cycles. App is disappointing.
There is very little editability in the app- if you miss recording the first day of your cycle for a few days, you can't go back and enter it accurately. You have to email customer service to get a full "fertility report" (aka pdf of all your temps) that usually takes 24 hours. This is something that could be easily automated in the app but hasn't been done yet. If they did just a little tweaking on the app, this could be the perfect tool (one should be able to enter notes and symptoms somewhat like the MyFlo app, so as to cross-reference symptoms, timing of sex and temps to be able to help make your cycle more healthy. Frustrating to have had this for two years and no significant changes to the app have been made, when those changes would be SO easy (have talked with some app creators about this!). You have to plug the daysy into your phone in order to upload the data and edit it. This is a bummer because it's not good for stress/health/ electromagnetic-whatever to sleep with the phone right by your head, and if you're even close to a regular amount of busy, it's tricky to remember to upload your data every three days so that you're within the three day window in which you can add notes/record menstruation, etc. to the new data on the app.
Come on, women! Make this daysy all it can be! Fix that app stuff!
Response from Usa DaysyJul 26, 2018
Hi Grace, I will reach out to you directly to address some of your specific concerns as I think there may be some miscommunication here. A new app update is coming out at the end of this summer which we think our customers will love.
AN
Anonymus
Great product, crummy app
Great product, crummy app. 90% of the time, the app does not sync with Daysy. It would also be great to be able to track other fertility signs: cervical height, fluid, etc. The graph is difficult to read. I do like the calendar view with predictions.
Response from Usa DaysyJul 23, 2018
Hello, we're sorry you've had some trouble. The app itself does not impact synchronization, so we will reach out directly to address how to synchronize. A new app will be released at the end of this summer and will include tracking of other fertility signs per our customers' feedback. We think you will love the new app.
HE
Heather
Disappointed
I really, really want to give you 5 stars, the technology is there, and it's been so helpful. BUT your complete lack of quality plastics is unforgivable. I'm on my second replaced daysy because of the crack that appears near the cord port. You are all aware of the problem and do nothing to fix. Yes I've been told ohhhhh we've switched, blah blah blah, but here I am again with a crack. Obviously it is not true. Get your manufacturing together, and I'll re-rate you with the 5 stars you could easily capture.
Response from Usa DaysyJul 23, 2018
Hi Heather, We're so sorry you've had this experience. We will reach out to you directly to see how we can best assist you moving forward.
NI
Ni
Disappointed :(
I purchased my Daysy several months ago so that I could get used to it before my upcoming wedding. I decided to use the Daysy alongside the Fertility Awareness Method (charting). I love the size and the look of it, and so far it has measured my temperature accurately.
Unfortunately, I have a major issue with the app and data storage piece. There is no option to edit information beyond 3 days. Because of some incorrect data entered (I was unclear about when my period had actually started), I ended up having to reset the Daysy after 2 weeks. Since the Daysy takes some time to learn your cycle, I was a little unsettled to have to push the process back another two weeks. Additionally, even with the spacer for my iPhone cable, it takes a while for the Daysy to sync to the app. For a $330 item, I was surprised to find these issues.
I seriously considered returning the Daysy, but the return window is very short considering the nature of the product. On the Terms & Conditions page, it states that all returns must be completed within 30 days of receiving it. Up to 14 days, it is a full refund minus shipping. From 15-30 days, there is also a 10% restocking fee. Although I understand this from the company's perspective, it is also frustrating that I was already at the end of the return window by the time I fully realized the issues I was experiencing with the Daysy.
I'm hoping that my experience will improve over time, but as of now I am a bit disappointed with my purchase.
Response from Usa DaysyJun 12, 2018
Hello, We're sorry you're feeling disappointed in your device. If we can ever be of assistance, please do not hesitate to reach out to us at [email protected]. We're always happy to help however we can.
MO
Morgan
Not worth it.
Does the job at taking your temperature but isn’t worth the money. Multiple times it won’t sync to the app, and the app is also outdated. I think it’s pointless to use it if you can’t see the data on the calendar in the app. Being the product is so expensive you would think that they would have a really nice and updated app. Also when buying it, it asked what kind of phone I had (I assumed it was to send my the right cable). I didn’t receive the cable for the iPhone X so I had to buy another thing to even use the product. Wouldn’t recommend. Needs improvement.
Response from Usa DaysyJun 12, 2018
Hi Morgan, We're sorry to hear you're not satisfied with your device. Most synchronization issues can be resolved quickly with ensuring the right steps are being taken. The app update should be released this summer, which we think our customers are going to LOVE. We ask what type of phone you have at checkout to see if we should send you a complimentary set of stability spacers to facilitate synchronization with the iPhone 6 specifically. Your iPhone X comes with the adaptor necessary to allow synchronization with Daysy. We will reach out to you directly to see if we can address your concerns.