3 features in the Natural Cycles app that will help you track your health.

Making better decisions around health and well-being is a worthy goal, and Natural Cycles is here to help. Whether you have used Natural Cycles for a while, or you want to get started now, there are always helpful tips to learn about fertility and your body.

Besides knowing your most fertile days, with the Natural Cycles app you will learn what is normal for your body. What’s more, if something seems off, you will know if it requires professional help. Below are 3 features in the Natural Cycles app that might help you tracking your health.


1. Length of your period.  

On average, periods last 3-5 days, but everything from 2-7 is normal. 

When tracking your fertility you will know how long your period is on average and see if it gets shorter or longer than usual. Irregularities may for example indicate a hormone or thyroid issue, or other health conditions which you might need to take precautions for. 

2. You will know exactly how regular or irregular your cycles are.

Knowing your menstrual cycle can help you not only know how you feel and what to expect through the different phases, but also help you diagnose and or manage conditions like PCOS or endometriosis. 



And if you ever want to plan a pregnancy – you can easily switch to the Plan a Pregnancy mode.




3. Natural Cycles notifies you when it’s time to do a breast self-examination.

The best time to do the breast self-examination is after your period, and before ovulation when the progesterone levels are the lowest. Since you know where in your cycle you are, Natural Cycles will remind you by sending you a message to do the exam.


Make 2017 your healthiest year yet, by making small changes. A small habit of measuring your temperature and entering it in the Natural Cycles app can make a big change. Start today!


How does the Natural Cycles algorithm work?

Behind the Natural Cycles app lies an unique algorithm that calculates your green and red days. This is the brains behind the app that pinpoints and predicts your ovulation, and the days you are fertile. What you might be wondering is how does it know when you are fertile or not?

natural cycles algorithm


The algorithm works by identifying your fertile days. These six days are calculated by taking your ovulation day and the five days before, because of possible sperm survival, into account.

Every woman and every cycle is unique, so the algorithm will have to get to know your cycles before it can tell you when ovulation has occurred. That’s why you might have more ‘red’ fertile days in the app when you get started with Natural Cycles.


Your basal body temperature shifts after ovulation and becomes higher due to release of the hormone progesterone. So the algorithm takes your temperature measurements and optional LH tests into account when calculating and pinpointing your ovulation and most fertile days. The app will let you know what your average temperature values are in luteal vs follicular phase, how your temperature curves look and get an overview of your fertile days. The algorithm will also calculate your predictions for the months ahead, depending on how regular your cycles are.



The longer you use Natural Cycles, the better it gets to know you.  It takes your cycle irregularities into account, the variation of your cycles and ovulation day, temperature fluctuations, length of follicle and luteal phase. On average, it takes up to 3 cycles for the Natural Cycles algorithm to get to know your cycles and gives you more and more green days.

The longer you use Natural Cycles, the better it get’s to know you.  You can see your irregularities in your stats page.  

Want to explore the powerful knowledge that lies behind our algorithm’s calculations? Sign up today and get to know yourself and your body better.


NEW feature – Calibrate your basal thermometer in the Natural Cycles app

With the new feature in the app, you are able to calibrate your basal thermometer. Calibrating your thermometer means you are able to see if you are measuring correctly, and if your thermometer is working properly.

natural cycles_basal thermometer

This is how you can calibrate your thermometer:

  1. Go to your account in the app or on the website.
  2. In your profile you’ll see “Calibrate your thermometer” button.


Now measure three times in a row, and enter it in the app. You can calibrate anytime and as many times as you wish!


To calibrate you need to measure your temperature 3 times in a row and enter the values in the app. Here is step by step instructions with few tips and tricks:


  1. Always measure in the same place and the same way for best results!

    Put the thermometer under your tongue, and only then click on the start-button. The thermometer will show you different values every time you measure. This is normal, since our temperature shifts, and also the thermometer gets warmer every time you measure. This is why it’s important to measure on the same place in your mouth when measuring, not only for calibrating the thermometer, but also when measuring every morning
  2.  The results and what they mean.

    When you’re done, the app will tell you if the calibration succeeded or if something might be wrong with how you measure, or your thermometer. The result you might get is:

    Calibration succeeded:  then everything is perfect and you should just keep doing what you’re doing.Calibration uncertain:  When the result shows “calibration uncertain”, you should first re-do the procedure and try again, as the result was borderline. Make sure you follow the instructions and measure correctly and in the same way all the three times. The second time you calibrate after getting the uncertain result, you will either get success or fail.

    Calibration failed: When your temperature shifts more than 0.3° degrees Celsius (or 0.54 degrees Fahrenheit) between the measurements, something might be either wrong with how you measure or your thermometer might need to be replaced. It is important to detect such issues early on as you otherwise might get too high day-to-day temperature variations for Natural Cycles to be able to detect your ovulation.


Have you calibrated yet? Log in and do it today and please comment on this blog post or leave your feedback here. If you’re not a Cycler yet, sign up today for the 1 year offer and get a basal thermometer included in the price.




What does it take to become a Star Cycler?

Natural Cycles wouldn’t be where it is today without the support of our strong community of Cyclers. We are grateful to all women spreading the word about us everyday. That’s why we decided to add the achievement of becoming a Star Cycler in the app.

“What is a Star Cycler?”

A Star Cycler status is the highest level you can achieve within the app, you receive full access to Natural Cycles for life – free of charge. That’s pretty freaking awesome.

“So how do I become a Star Cycler?”

Firstly, you must be a Pro Cycler to become a Star Cycler, which means that you fully understand how the app works and have had quite some experience with using the app.

Secondly, you should help us spread the word and vision of Natural Cycles to other potential Cyclers out there by referring 10 friends to Natural Cycles, you will get an email with a link to share with friends once you are a Pro Cycler. So get chatting with your girlfriends and sharing on your social media channels ladies. 

See you at the top,

Your Natural Cycles Team


Upcoming changes to Natural Cycles


During the past year we have continuously added more features and content to the application but we are not done yet! While you are reading this, our product team is hard at work on new content in the app that we hope will excite you. The changes are targeted at both new and experienced Cyclers with the goal of making it easier for all to go from novice to pro as well as getting more useful content. Feel free to have your say on all the changes in the comments below.



The “Me page” becomes “Cycle Statistics” and gets a redesign
We know that many cyclers really appreciate that they can see the numbers behind their unique cycle on the “Me Page”. That is why we have put some extra love into redesigning the visuals as well as adding some more content. In the new version you will be able to compare all your data with the average for all Cyclers, access deeper information on how to interpret the data and see how well you are performing at entering measurements. All the data will be split into four tabs; the full cycle, the follicular phase, the luteal phase and the ovulation. There will also be a small version of the graph to go with the different phases of the cycle.

Another important improvement is that you will now get direct feedback on is your temperature fluctuations. We will rate your fluctuation as either “Excellent”, “Good”, “OK”, “Problematic” or “Too high”. If your rating is “Problematic” or “Too high” we will give advice on how to improve and what the reasons for this may be. Hopefully this will help you lower your temperature fluctuations, which will help us to faster find your ovulation.



Cycler level

Are you a newbie or a pro? Well soon you will find out! As a part of the new profile section and the progress you make we will give you a rank of “Newbie”, “Junior”, “Skilled”, “Pro” or “Star” (the exact name of the ranks are still being discussed so feel free to give us feedback on them). We hope that this feature will put focus on your own individual performance and act as a motivator.



Achievements are intended to guide and motivate new Cyclers as well as will give a hint on what to expect from using the app over time. The more achievements a Cycler has reached, the better both she and the app will have gotten to know her unique body and cycle. An achievement is reached by completing tasks within the app or when the app first recommend the Cycler to perform a certain task. Here are a few examples of the achievements that will be available:


  • Add your first temperature measurement.
  • Add five temperature measurements in one week, Monday to Sunday.
  • Add twenty temperature measurements in one calendar month.
  • The application has detected your ovulation for the fist time.
  • The application has recommended you to take a LH test for the first time.
  • Get over 50% green days in one cycle.


“My Profile” is the new “Settings”

With the addition of your Cycler level and achievements we are renaming the settings tab to “My profile”. This will be where you can find these new features, all your personal settings and manage your account. We will also make your renewal date and selected payment option more visible.



New navigation

To go with all the new content and changes listed above we will make some adjustments to the tab navigation of the app. We will introduce a new icon for the “Cycle Statistics” tab and the “Me” icon will replace the old one for settings as this tab becomes “My Profile”. We are also considering adding labels to the tab navigation. As always we would love your feedback and thoughts on these changes.




Brand new graph design and features

We hear you, Cyclers! We appreciate all the feedback we have received on the app! We’re happy to announce the release of the new (and improved!) graph. Read all about the exciting features, below!


Access the graph whenever you want!

To view the graph, turn your phone to landscape mode and the graph will appear! Just make sure that the portrait orientation lock is off and you’re good to go.


Lines between the temperature values


You’ll notice the new graph now has lines between the temperature values. This is to make it easier for you to see the (possibly) slight fluctuations in temperature.




 Scroll through one, three or nine cycles

You can now see one, three or nine cycles at the same time. Also you can click on the ‘previous’ button and see previous cycles, one at the time.



See an estimate of your next temperature graph!

Now, you can see an estimated forecast of how your next temperature curve might look. This is a great feature for those of you who just started measuring.



New safe sex icon and changed place of the icons 


Now there is an icon for safe sex too, so you will see it in your graph whenever you log a protected intercourse. Before, the icons for intercourses were seen below the temperature chart, but now they are above it. The reason why we switched places is because sometimes the low temperature values could be hidden by the icons, and now you can clearly see both.


Let us know your thoughts and keep the feedback coming. We are listening! Also thank you for all support!


The Natural Cycles Team

Why do I get more red days?

Cyclers that are tracking their fertility with Natural Cycles sometimes wonder about the amount of red days. If you just got started with Natural Cycles it’s normal to get more red days. Natural Cycles is getting to know your unique cycle and probably hasn’t detected your ovulation yet. It is highly individual how fast ovulation can be found but usually it takes 1-3 cycles of measuring and adding data. So be patient and keep measuring. The red days will decrease with each cycle as the app gathers more data on you.

What other reasons can give you more red days? Let’s find out below!


  • After hormonal contraceptives

Our data shows that those who have previously taken hormonal contraception and just started with Natural Cycles experience more red days in the beginning. This is because it can take a while before your body starts ovulating again and the first cycles are often highly irregular. Since the first ovulation can come early or late, without warning, you will receive red days until it happens. So keep measuring!

  • Fluctuating temperature

If your temperature fluctuates more than usual, the app could give you more red days since it becomes more difficult to detect ovulation. Make sure that you always measure as soon as you wake up, and skip measuring if you sleep more or less than usual (+-2 hours).  Also skip measuring if you drink alcohol and feel hungover when you wake up or if you’re ill. Read more about how and when to measure.

  • Irregular cycles or anovulatory cycles

Some women have more irregular cycles than others. In your cycles statistics you can find out how much your ovulation day varies, and how regular or irregular your cycles are. You can also see how often you experience cycles without ovulation.


It’s rare that ovulation occurs on exactly the same day every cycle but for some women it varies a bit more than a couple of days. This is especially common if you have recently given birth or were taking hormonal birth control. Irregular cycles will give you more red days since your ovulation might be delayed or as a precaution if your ovulation will occur earlier than usual.

Tips for Cyclers that experience more red days

What could help Natural Cycles isolate your fertile window and help you get more green days is testing for LH (luteinizing hormone). A surge in LH occurs two days before ovulation and marks your most fertile days. Natural Cycles will let you know when you can begin testing your LH levels. See what our reminders look like and please read more about how and why you should test for LH.

Please feel free to email us if you would like for us to take a look at your data and help you with your chart!


Natural Cycles Team

Top measuring questions

In order to get the most out of Natural Cycles, it is important to measure at the right time in the right way. We decided to summarize the top 3 questions that we received from you on this topic.



1. Sometimes I wake up in the middle of the night and have to go to the bathroom. Can I still measure in the morning?

We recommend at least 3-4 hours of sleep before measuring. So, if you visit the bathroom 5 or 6 hours before it’s time to measure then you can go back to sleep and measure as usual when you wake up.

If you instead tend to wake up 1 hour before your measuring time, then you can measure at that time, as we recommend measuring within +-2 hours of timeframe.


2. Can I measure 30 minutes after I wake up, but still in bed?

If you like to snooze (like some of us do) then we recommend measuring as soon as you wake up first time. This is because we want to capture the basal body temperature, and your body will ‘wake up’ the more you wait and change the temperature. So for correct results measure as soon as you wake up and then keep snoozing!


3. I have a baby, and wake up several times at night. How should I measure?

We know that it could be difficult to keep up with the measuring if you have a baby to take care of and need to wake up several times per night.
We recommend you to measure as often as possible,  and after the longest period of sleep. Should one night be much worse  than your ‘average night’ then we recommend to simply skip measuring in the morning. 

measure basalbody thermometer

Also, here is a friendly reminder of dos and don’ts when it comes to measuring:



  • Always measure first thing in the morning, before you get out of bed in the morning.
  • Always measure underneath your tongue so that the metal point sits at the root of it.
  • For the first 3 cycles, try to measure as often as possible.
  • For the 5 days before and after expected ovulation, try to measure every day.
  • Disable temperatures if they seem abnormally high due to being sick or a change in routine: Long sleep-ins, drinking heavily, late night, slept badly.

Do not:

  • Do not measure on sick or hungover days as this will give you more red days than necessary.
  • Do not measure once you’re up and out of bed as this reading will not be your resting temperature (BBT).


The Natural Cycles Team

Natural Cycles Graph Update

Dear Cyclers,

You may have encountered difficulties to access your graph in the new app – for example, a ‘blank screen’ appears or the graph does not load properly. This software bug has been fixed several weeks ago, but we are waiting for the new update to be released in the App Store! It will be available soon.

In the meantime, you can still get it to work! What happens is that the graph icon is highly sensitive and if you tap on it for ‘too long’ or click on it multiple times it will ‘break’ (meaning it will not load at all or appear as a white screen.)

What you can do if this happens is the following:

  1. First you need to close the app and re-open it. (Double-click your home-button on iPhone and slide up the NC app)
  2. When you enter the app again, click only very softly/quickly on the graph-icon and wait for it to open. It should work!

If you cannot wait, note that you can always access Natural Cycles through our web-app to get the latest version: https://www.naturalcycles.com/en/app

We apologize for the inconvenience and thank you for your patience.

We’re also currently working really hard on creating the best user experience for you and we would love to hear your feedback:




The new graph will have a custom design optimized to be viewed on a phone. It will be displayed in landscape mode on your phone for best overview and we have tried to make it cleaner, with less visual noise.

It will also be supplemented by a history list view. Each day will be listed with icons indicating what happened on that day and what data you added. Does this sound like something useful for you Cyclers? Would you use it?


 Pasted image at 2016_01_04 01_40 PM




















We would love to hear your feedback regarding the new graph design so please comment below with your thoughts!

Have a great day!

The Natural Cycles Team

What’s new about the Natural Cycles app?

Dear Cyclers,

You can now download the new updated version of the Natural Cycles app. We worked really hard to improve it and listened to all of your valuable feedback. We’re super excited and proud of it, and we hope you’ll like it as much as we do!

Along with the major design changes, we have even more news! Natural Cycles is now available on Apple Watch, and the Natural Cycles algorithm has been updated to even more accurately find and narrow down your fertile window.


Track your Fertility mode

Safety is our number one priority and it was therefore important to make sure that the new design reflects what’s most important about Natural Cycles.

  • The focus in the new app is on today’s fertility status – red or green.  Simple!
  • Below your current fertility state, you can see your predictions for the week. Here, it was very important to make clear that predictions may change in the future and should not be taken for granted – just like with the weather.
  • After today’s current view, you can switch to have a monthly overview presented to you as a calendar. Here again, it was very important to separate your past fertility from future predictions.
  • If you want to dig a little deeper into your data, you can have a look at the graph as well as your cycle statistics.


The new design is a result of several thousands of hours listening, analyzing and engaging with your feedback. Thank you!


Below, you will find an explanation of the icons as well as some answers to most common questions.


prevent overview


How to enter data


To enter your daily data, click on the + in the upper right corner. Enter your temperature and if you want to add any additional data, such as ovulation test result or a note, you click on “additional data”.  Click ‘save’ and you’re all set! In this view you can also swipe to the left to go back in time to see your previously entered data. If you have entered any data and then swipe back, your data will be saved automatically!


How to access the graph?

the graph view

You can access your graph under the “today” view by tapping on the graph symbol in the upper right corner – we are currently working on further improving the graph, so stay tuned!



Changes in the algorithm

With significantly more data from all you Cyclers, we were able to optimize our algorithm for the new app such that it will identify and predict ovulation and your fertile window with even greater accuracy. This update in algorithm might lead to small changes in the history of your data, which means that you might see a previously red day change into a green day, and vice versa. This is normal because we run a new, improved algorithm over your entire dataset. You do not need to worry about this – important is to always check today’s fertility status!


Natural Cycles Plan mode


For Natural Cycles Plan users, we focused on clearly highlighting your most fertile days. The most fertile days are indicated in red, while your less fertile days will be shown in different shades of soft pink colors. Your non-fertile days are shown in  a light grey color.
overview plan

We’re excited to hear your feedback,


All the best,
The Natural Cycles Team