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 2.3.3

Stability improvements

Ratings and Reviews

1.9 out of 5
34 Ratings

34 Ratings

emmaferr ,

Very disappointed in this app

This app is essentially unusable and ruins all of the positives about the Daysy itself. About 90% of the times I try to open it I cannot - the loading screen will pop up and stay there. We’re talking minutes on end of staring at the loading screen without the actual app itself opening. Sometimes it does open but is frozen (can’t click anything) and immediately crashes. If the app actually does open and let me sync, it’s a miracle. I contacted customer support and their advice was to make sure my app was updated - it is. The app is not overly complex - it doesn’t seem to me that it should be so difficult to ensure it has basic functionality. Quite annoying to pay so much for a glorified thermometer and not have the company take the basic steps necessary to ensure the app (probably the majority selling point for a lot of users) simply opens and syncs...

Developer Response ,

Please contact customer support at for assistance. They will be happy to help you resolve this issue.

kaylandyan ,

I love this product!!!

Ok, so to be honest. The product is fantastic!! It’s the first thing I’ve found that has helped me feel in control of my cycle. I think it would be a wonder for people trying to conceive, or have endometriosis, or PCOS, or even just don’t want to have to take a medical contraceptive!
I’m not going to lie, the app has had its issues. But none have have prevented me from using the product. The only issue I have had the last year is that it won’t connect the first time I try to log my temp in the morning. But it always works the second time. And it keeps your temperature for 24hrs. Which is amazing if you don’t have time to mess with it in the morning.
Also, if the app is messing up, you can still just look at the light on the thermometer to see if you are ovulating, or not. Or just to put in that you’re on your period. So I’d say COMPLETELY worth the money. I will use it forever!!

Developer Response ,

Thank you for your feedback! Your data is always stored on Daysy, so please don't ever worry about losing the data if you do not sync for a period of time. Customer support will be happy to assist you regarding the issue of the incomplete synchronization on the first try.

mooncycle13 ,

I no longer recommend Daysy because the App is so horrible

I used to ONLY recommend Daysy, but ever since they changed the app I no longer recommend it, which is so unfortunate because the device itself is incredible but the app literally makes it useless. The App is literally useless. It does not save information when you sync, which can then screw up your data for the holy month. When I tried to record notes, sex, or period it simply won’t let me click on the items. I make sure the app is updated just like customer service said, but it does not matter - it still does not work. It really is so unfortunate because the device itself I love but I literally won’t recommend this product to anyone because the app makes it useless.

Developer Response ,

We're sorry to hear of your frustration with the app. If you are synchronizing for the current day and then making your edits and they are not saving, please report this to the support team at so they can find the cause and a solution for you.


Valley Electronics AG
41.7 MB

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


English, French, German, Italian, Spanish

Age Rating
Infrequent/Mild Medical/Treatment Information
Infrequent/Mild Sexual Content and Nudity
Infrequent/Mild Mature/Suggestive Themes


  • Family Sharing

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

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