DaysyDay Cycle, Period Tracker 17+

Track your period & fertility

Valley Electronics

Designed for iPhone

    • 3.5 • 63 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.

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.

What’s New

Version 1.5.1

Thanks for using DaysyDay!

In this version:
- Updated display of the daily data in the weekly view
- Chart includes a new data matrix displaying menstrual flow, intercourse, and mucus (An initial step to expand tracking features)
- A link to explanations of the cervical mucus types added to the Mucus card
- Visit the settings menu for a direct link to rate the app (Ratings are greatly 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 -> Contact support). We are constantly working to add new features and improve your overall app experience.

Ratings and Reviews

3.5 out of 5
63 Ratings

63 Ratings

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

Lydia Schmidt ,

Love it- but improvements could be made

Overall I love the Daysy and the app! The 2 changes I wish I would see are: having the temperature graph show smaller increments, and being able to sync the daysy with other apps.

The graph showing 0.1 degree increments (F) are helpful, if not necessary for those of us using daysy as a tool when avoiding pregnancy with FAM.

Being able to easily sync the daysy to automatically put temps in other apps (such as read your body) would be very helpful, as many of us use multiple apps to track things. This is something temp drop is doing and a reason why I may make the switch.

Developer Response ,

Thank you for your detailed feedback. We will be sure to pass this along to our development team.

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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