DaysyView is the free companion app to the Daysy fertility tracker. Together, Daysy and DaysyView provide you with a greater understanding of your menstrual cycle.

Daysy and DaysyView 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.

Key Features:

Statistics & forecasts
Look at your fertility status, predicted ovulation, confirmed ovulation, menstrual cycle calendar and statistics, temperature curve

Take notes
Track cervical mucus, intercourse, and your own notes about your fertility and cycle.

Contact our expert team
Easily reach out to our expert team if you need advice and support.

- It is always best to enter menstruation directly on your Daysy. Turn Daysy on and then press and hold the button until the violet light remains illuminated to confirm menstruation. The edit feature in the app is available for special circumstances when needed.

What’s New

Version 2.3.0

-Stability improvements
-Text changes
-Updated privacy policy

Ratings and Reviews

1.5 out of 5
56 Ratings

56 Ratings

The cookie chick ,

New Update

I loved using the Daysy until this last update. I wish now that I would have never clicked on it! The last app was easy on the eyes, the temperature page was professional looking, slender graph lines and such, and the app would sync in a few seconds without a fuss. Anything that I needed to edit was right there in front of me, I didn’t have to go searching for it. Not anymore!!
The new app... it takes forever to sync, the graph for recording the temps looks more like a baby toy, and finding how to edit your period days is not super easy like it use to be. I also don’t like that there is a three day cut off to where you can’t edit when you started your period. I called the tech team and they said that one day would not make that much difference but still, I like my stuff to be exact.
I just don’t understand why do you have to change a good functioning thing. All for the sake off a “new look” ? We don’t care about a fresh look in fact we all liked it just the way it was!! If you don’t believe me ... look at ALL of the comments! Not one good thing to say about this new upgrade. PLEASE put it back to the way it was visually! You guys can fix bugs and glitches and all that other stuff without completely changing the look of the whole thing... Come on!!

diehardyankeesfan ,


I spent over $300 on a device that does not work without this horrendous app. First of all, why on earth can I not edit my period dates? This is absolutely ridiculous and should not even be an issue! Secondly, I have to close out of the app multiple times in the morning to finally get the Daysy to sync my temperature. This also should not be an issue with a $300+ device. The app is severely lacking in details, information, etc. as well. I have resorted to using other FREE apps that offer far more than this. I regret spending so much money on a thermometer that is paired with such a useless app.
RECENT UPDATE: Now the app won’t even open at all! I can’t sync my temperature. I can’t even see what my temperature is! This is absolutely ridiculous. I will never buy another Daysy and I will never recommend one to anyone else.

Developer Response ,

We're very sorry to hear of your less than satisfactory experience. The app freezing issue was affecting a small percentage of users with the new iOS 12.4.1 update, but there is a fix if you are still having trouble, so please be sure to contact support. Menstruation can be edited through the app, but you must first sync for the current day and let your Daysy fall asleep. If you have Daysy 2.0, menstruation should be edited directly on Daysy. Our excellent support team can teach you how to do this or there are video tutorials on the Daysy website.

Kelley288 ,

Garbage app for the price of this device.

I was so excited to get and start using my Daysy, but this app is AWFUL. I have to plug it in a few times before it decided to sync the data, and there have been some days where temperatures don’t show up and I know I took them. The app also won’t let you edit your period unless you sync it first and even then you have to do it within 3 days. Developers-FIX THIS. Every review is 1 Star, that should tell you something. I regret buying this device and would never recommend it to anyone unless these issues are fixed. This device tracks a woman’s OVULATION. The app should be perfect, and it’s not even close.

Developer Response ,

We're sorry to hear of the trouble you've had with synchronization. It sounds like you have an older Daysy 1.0 model, but we're not sure of your phone version. Please try the following: Turn Daysy on and connect the cable to Daysy and your phone. Now open the app. This should help you sync better. If trouble persists, please contact the support team at for personalized assistance.


Valley Electronics AG
44.4 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German, Italian, Spanish

Age Rating
Rated 12+ for the following:
Infrequent/Mild Medical/Treatment Information
Infrequent/Mild Sexual Content and Nudity
Infrequent/Mild Mature/Suggestive Themes
© 2019 Valley Electronics


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like