DaysyDay - Period Tracker

247 reviews
Content rating
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About this app

Winner of a Best of Swiss Apps 2021 Award, the companion app to the Daysy fertility tracker is designed with the feedback from our users and decades of experience in the fertility tracking market. Together, Daysy and DaysyDay provide you with the knowledge and tools needed to identify your fertile window and make informed and powerful choices about your menstrual cycle, fertility, and health.


Past, Present and Future
The easy-to-read calendar and an uncluttered temperature curve make it easy to view your fertility status, ovulation, and menstruation for the past, for today, and what is predicted in the coming month.

Identify Irregularities
The temperature curve and easy-to-read average and individual cycle statistics can help you easily identify cycle irregularities and provide insights on how current events affect your overall cycle.

Take Notes
Daily data cards let you easily track additional cycle features. Track cervical mucus, intercourse, and your own notes about your fertility and cycle.

Share Your Data
Invite your partner to download the DaysyDay Partner app and then choose which data can be shared and viewed.

Contact Our Expert Team
Use the Contact Support feature in the Help menu to easily reach out to our expert team if you need advice and support. Our team is here to help you every step of your fertility tracking journey.
Updated on
Oct 10, 2023

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Location, Personal info and 4 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

246 reviews
Kayla Bear
April 28, 2022
I love the Daysy, and its app. Many reviews are wishing for the old app layout, but im new so I cannot compare. However I find the interface extremely easy to use and read. Make sure you allow location to be used during app use, and bluetooth on before trying to connect the Daysy. I had problems connecting with my One Plus. But they went to great lengths to make sure I could get it working. So do not let this suade you from not buying Daysy. Best thing I've ever gotten. Will recommend to all.
1 person found this review helpful
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Valley Electronics
May 14, 2022
Hi Kayla! Thanks so much for your review and your feedback! Our support team is always happy to help, so please don't ever hesitate to contact us with any questions or concerns :)
Yelena Lebich
September 16, 2022
It works. At first I gave it a bad review... because I thought that the device wasn't taking my measurements... but someone was able to help me out with that over a fb message call. To track your measurements... you first have to hit the center button once... and then again one time... I wasn't doing that initially. I was just hitting it twice accidentally. It's a little complex to use... but I'm glad that they where able to show me how and that it actually works. :)
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Valley Electronics
September 15, 2022
Thank you so much for your review! Our customer support team is always happy to help our Daysy family :)
March 21, 2022
I just started using daysy 4 days ago, pretty premature to write a review but I felt I had to because this thing is not just friendly. My biggest frustration is with it syncing to the app. Each morning I take my temperature, then it takes me at least 30 minutes of trying and restarting all devices to get the two to sync. If I sync it immediately after taking my temp, it usually connects but says no data transferred. So I wait for daysy to turn off (because you can't shut it off manually), restar
Did you find this helpful?
Valley Electronics
May 14, 2022
Hi Anna. We're just checking in again. Were you able to contact our support team and have your concerns resolved?

What's new

Thanks for using DaysyDay!

In this version:

- Updated display of the daily data

- Chart includes new data matrix displaying menstrual flow, intercourse, and mucus (more to come)

- A link to explanations of the cervical mucus types included on the Mucus card

- Rate the app from the Settings menu (Reviews are appreciated!)

- A few additional bug fixes and stability improvements to enhance your experience.

Have questions or suggestions? Send us a message in the app (Settings -> Help).