DaysyDay Cycle, Period Tracker 17+

Track your period & fertility

Valley Electronics

Designed for iPhone

    • 3.4 • 55 Ratings
    • Free

iPhone Screenshots


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.

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.

What’s New

Version 1.5.0

Thanks for using DaysyDay!

In this version:
- New color legend for the fertility statuses
- Refer a friend discount codes for applicable countries
- 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 -> Contact support). We are constantly working to add new features and improve your overall app experience.

Ratings and Reviews

3.4 out of 5
55 Ratings

55 Ratings

AnaKatrina001 ,

Very Basic

This app is just okay, I just wish there were more areas we could track, like how our mood (happy, nervous, tired, depressed, grateful) etc. It would also be great to choose more than one mood to track the day, since moods can change throughout the day so why limit it to one? Also, being able to track exercise, m*sterbation, and having more options for cervical fluid because there are more than just four.

I also want to point out that when I’m writing notes, and I want to go back and make a correction in my sentence, each time I type on the keyboard the pointer will jump to the very end of the note, which makes it nearly impossible to make corrections because the flow of typing is completely ruined.

I think for a device that’s around 300 dollars, the app needs to have way more features because right now it feels pretty subpar, especially compared to some of the free period tracking apps out there.

I really hope to see these suggestions integrated in the future, that would make my experience (and hopefully others) so much better! Because I don’t want to use Daysy to just track my temperature, I want to use it track the entire spectrum of my cycle. ❤️

Developer Response ,

Dear AnaKatrina, thank you for the detailed feedback! We love to hear what our users would like to see developed in future versions of the app. Stay tuned for new features in the coming updates :)

shana3513 ,

It’s okay.

I like that it gives me information but I don’t like the small colored dots under the calendar day, they are very hard to see. I prefer the old app for this reason. Also in the chart section I wish it could be enlarged and could just would say 96 degrees, 97 degrees etc instead of 95.9, 96.8, 97.7. To me it takes more time and focus. I prefer the old chart abs calendar view. But I do like the other updates.

Developer Response ,

Hi Shana3513 - Thank you for you valuable feedback. We would love to receive more detailed feedback and discuss your ideas about the temperature curve with you. Please email us at

lac2021 ,

Not very impressed

This app works faster than the previous one but the tracking options are very similar.

I was hopping to track details such as spotting (bleeding outside of the regular period time), ovulation test results, etc. There are so many options in the market that track everything in one place and pair with BTM devices. I feel frustrated for having bought A device as expensive as daysy and not getting everything I need.

Why can’t you save your period without syncing with the thermometer? This is crazy, I couldn’t sync my device at the moment I entered my period details and now I can’t input the actual day my period began. Very disappointed.

Developer Response ,

Hi Lac2021. Thank you for the feedback. We will be adding new features with each update to the app, so we think you'll be pleased as the app progresses.
Your Daysy is where the fertility calculations are done and all data is stored, so you must have up to date information on the app before you can make any edits. It's actually best to edit directly on your Daysy (you can do this at any time of the day - or within 3 days for Daysy 2.0) or you can make changes to the previous day after synchronizing with the app the next morning. Our support team will be happy to walk you through these details if you email them at

App Privacy

The developer, Valley Electronics, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Health & Fitness
  • User Content
  • Identifiers
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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