Frequently Asked Questions

General questions about Daysy

Yes. If you sleep with your mouth open, just close it once and swallow before you measure. The measurement is finished when the temperature has reached its final value and you hear a soft beep beep from Daysy. Daysy may take a couple of seconds longer to measure for those users who sleep with their mouths open. Please be sure not to open your mouth while measuring.

Daysy is programmed with a complex algorithm which evaluates your cycle by tracking your morning temperature (taken under the tongue) and knowing when you have your period. Daysy will then show you right away if you are currently fertile or not.

Yes, your initial Daysy order includes everything you need.

That depends on whether the medication influences your body temperature or your cycle. In general, you should skip measurements while you are taking such medication. If you have doubts, contact your doctor or our customer service team.

In general, you should skip measurements during illness, fever, and while you are taking medication that can have an influence on your body temperature or cycle. If you have doubts, contact your doctor or our customer service team.

Remove the battery and store Daysy in a dry location in its original packaging, if available. You can find more information in the instruction manual.

The first 2-4 cycles of use are considered Daysy's learning phase. Over the course of her learning phase, Daysy will come to understand your cycle and begin narrowing down your fertile window. Daysy remains quite cautious and conservative during this time, which is why Daysy is accurate starting the very first day.

Based on its recorded data, Daysy can compensate for the occasional missed reading. We still recommend you measure as regularly as possible so that your fertile phase can be narrowed down as precisely as possible. If you have to skip measurements due to illness, Daysy will get back on track once you start again.

You can rely on Daysy's results starting the very first day of use. In the beginning, you will see more yellow and red days because Daysy is still learning your unique cycle. You will see more green days as Daysy comes to understand your cycle and can narrow down your fertile window. The more regularly you measure, the better.

Smoking should not influence the result. Alcohol, if consumed excessively or when your body is not used to it, does influence basal body temperature. If you can feel that you were drinking yesterday, you should skip your reading in the morning. If you feel just fine and have no headache or other symptoms of alcohol consumption, you are fine to temp as usual.

Default delivery will be by First Class mail with an expected delivery of 5-10 days. For the delivery of your order, you may choose to upgrade your shipping to Priority Mail (2-3 day delivery) or Express Mail (1 day delivery to most locations). You can find all the information in the general terms and conditions.

Daysy comes with a 2-year warranty. You can find all the relevant information in the general terms and conditions.

Ideally, you measure daily. The fewer measurements you miss, the better.

No, Daysy is your individual fertility tracker with your individual data.

Questions about DaysyView

Yes, DaysyView works with most Androids and iOS.

When you synchronize Daysy with DaysyView, all data on Daysy is transmitted.

DaysyView 2.0: When you synchronize Daysy with DaysyView, all data on Daysy is transmitted. You can manually add notes, sexual intercourse data, and cervical mucus information.

No. Daysy begins her calculations starting the first day of measuring.

The app DaysyView is available for iOS and Android and can be downloaded to smartphones and tablets from the app store. There you will also find the latest versions and information on software requirements.

Daysy 1.0: Open DaysyView to the calendar display, plug the cable into your phone/tablet and into Daysy, and turn Daysy on. If you're using a smartphone without an outlet for headphones, please use the adapter. DaysyView will then detect Daysy and your data will be automatically synchronized. Please be patient, the synchronization may take some time. If Daysy falls asleep during synchronization, wake her up again. You can unplug Daysy, if the current day is highlighted. Make sure that Daysy is awake. The more often you synchronize, the less time it will take.

Daysy 2.0: Please be sure to enable Bluetooth® on your smartphone or tablet. Open DaysyView and click on Daysy Bluetooth®. Turn Daysy on and then press the activation button 2 times to enter Bluetooth® mode (blue light blinking). Now select the Sync button in the top right corner of the app to start the synchronization process. Daysy is communicating with the app when the blue light remains illuminated.

No. As soon as DaysyView is used with Daysy, it only considers her data.

DaysyView is an app available for free download in your app store. When used and synchronized with Daysy, the app displays your past, current, and future fertility status.

No. You can use Daysy without the app. Daysy takes your temperature, performs your fertility calculations, and houses all of your data.

Daysy 1.0: Please only use the cable we provided. Contact customer service if you no longer have it.

Daysy 2.0: You do not need any cables to sync with Daysy since Daysy now syncs to your smartphone or tablet via Bluetooth®!

How do I use Daysy?

Use Daysy in the morning right after waking up, before getting up and becoming active. Measure below your tongue, with your mouth closed, and keep the device steady while it is measuring. We do recommend that you sleep 3-4 hours before measuring.

Daysy 1.0: If you traveled overnight, skip the first measurement after your arrival and continue to measure regularly the next day after resuming a normal sleep cycle. Do the same thing when you return home from traveling.

Daysy 2.0: When traveling with your Daysy, it is important to set the time on your Daysy to the local time before resuming your temperature readings. Set your mobile phone to the local time zone (many phones will do this automatically) and synchronize your Daysy with DaysyView to set the time on Daysy. Take your temperature and resume use as normal the next morning.

Please contact your customer service for guidance.

One or two skipped measurements are not a problem; Daysy will simply use your earlier data to calculate your fertility. Multiple missing values per cycle will lead to a higher number of red or yellow days.

Simply press the activation button and your fertility status will be displayed.

No. Daysy will only record the first measurement of the day.

You can immediately start with the measurements. If you were using hormonal birth control before, stop using it before you begin measuring. The first bleeding after coming off hormonal birth control is a withdrawal bleeding and must not be entered as your period.

Below the tongue in the pocket next to your frenulum and with your mouth closed. It is best to measure on the same side each morning if comfortable.

Yes, you can. Daysy is also reliable during the transition to menopause. If your ovulation is delayed or doesn't occur, Daysy will display more red and yellow days. Using Daysy will allow you to directly observe the changes that are happening to your cycle.

Yes, you can always rely on Daysy. If you have to skip a measurement after a sleepless night, Daysy will still reliably display your fertility status. Depending on where you are in your cycle, Daysy will react accordingly.

Yes, but we do recommend that you sleep 3-4 hours before measuring. If you don't get that during certain nights, there is no reason for concern. Daysy can handle skipped measurements from time to time.

It will take approximately 60 seconds to measure

Daysy automatically switches off after 60 seconds.

No. Daysy only records the first daily measurement. If you have concerns about a reading, please contact our customer service team.

No. What is important is that you measure immediately upon waking after getting 3-4 consecutive hours of sleep, before getting up and being active.

You can change menstruation data for the same day by turning Daysy on and pressing and holding the activation button until the purple/blue light is no longer solidly lit.

When Daysy displays a red light, it means that you are fertile. You can check your status anytime by activating Daysy.

Turn on Daysy. Press the activation button until the violet light lights up without flashing and you hear a "beep". Confirm you are menstruating for each day of active bleeding and flow for a minimum of three consecutive days.

Yes. Daysy has been designed for women like you. Simply take your temperature when you wake up.

Daysy 1.0: Daysy only registers one measurement after 18 hours have passed since your last reading.

Daysy 2.0: Daysy only registers one measurement per day. If the next day has not yet started, a tone (beep-beep) will sound.

Yes, Daysy can be used while breastfeeding. You should not start measuring until 6 weeks after birth. Since there ist no way to predict the first ovulation after birth, Daysy will stay yellow until the first menstruation is entered postpartum. Once you enter your first period, Daysy will display fewer red and yellow days in the following 2-4 cycles as Daysy gets to know your unique cycle rhythm.

Questions about my cycle

Daysy expects a certain amount of normal irregularity. Daysy can handle cycles from 19-40 days with her sophisticated algorithm. The statistics in the app display the ovulation range. If your ovulation fluctuates by more than 4 days or if your cycle length lies outside the 19 - 40 day range, please contact our team of experts.

It is normal for cycles to fluctuate. If you're unsure, feel free to contact our customer service.

Certain "strict" diets can lead to cycle irregularities, often times causing your period to come later. If you're unsure, reach out to our support team.

Yes. Daysy has been developed to safely recognize cycles that range between 19 and 40 days. However, using Daysy with extreme fluctuations would lead to a higher number of red/yellow days. Fluctuations of up to several days are no problem for Daysy. If you have questions about your unique cycle, please reach out to our team of experts.

No, over-the-counter pain medication will not influence the measurements. The common additional antifebrile effect does not influence the basal temperature. However, please do not temp if you're using these medications to control a fever. If you're unsure, please contact our customer service.

Only very few (hormone-free) medications have a direct influence on your measurements, but often the reason why you are taking medication can influence your temperature (e.g. fever or stress). Hormonal medication will influence your temperature and should under no circumstances be taken in combination with Daysy. If you're unsure, consult with your doctor or contact our customer service.

The typical influences on your temperature and cycle include:

● excessive amounts of alcohol ● sleep deprivation ● disease or illness ● chronic physical or emotional stress ● significant exercise ● strict dietary restrictions / starvation ● malnutrition ● travel

Once you know the cause, many irregularities in your cycle are easy to reverse. Feel free to reach out to our customer service to discuss your temperature curve.

If your efforts to become pregnant have not been successful within six to twelve months, consult your physician.

Technical Questions & Troubleshooting

Daysy 2.0: The blue light on your Daysy's activation ring will move from the bottom upward while charging. All of the blue lights will light up once the battery is fully charged. Daysy may enter standby mode while charging. Simply press the button to check the charging status.

Daysy 2.0: Before you contact our support team please try to charge Daysy with the USB cable at the USB port of your PC or phone charger over night. While Daysy is connected to the power supply, push the button once. Check if the charging indicators show up (rising if charging, full ring if charging complete). If yes, wait till the charging is completed and remove the USB cable. If Daysy still does not wake up again, please contact our support team for further instructions.

Daysy 1.0: If your Daysy makes the “grumble-buzz” sound when you are trying to enter the temperature reading mode, this is Daysy’s way of indicating that the cable is still connected or she thinks the cable is connected. If your cable is connected, please turn Daysy on, remove the cable and then press the button again to enter the temperature reading mode. If your cable is not connected, then please turn Daysy on, insert and remove the cable several times, then press the button again to enter the temperature reading mode. If Daysy makes the “grumble-buzz” sound when you are recording your temperature, then she is indicating that your temperature value is too low, too high, or too unstable. Please make sure you have removed the cap from Daysy sensor before placing it under your tongue, that your lips are closed around the neck of the sensor, and you do not move the sensor around while recording.

Daysy 2.0: The "beep-beep" sound is Daysy's way of indicating that temperature reading has already been recorded for this day. Please wait and take your temperature tomorrow morning. A temperature reading can only be recorded once a day.

Daysy 2.0: Please contact your local customer support team.

Daysy 1.0: Daysy uses a CR2032 battery which can be purchased anywhere standard batteries are sold.

Daysy 2.0: Daysy now has an internal battery that charges by connection to a power source using a microUSB cable which is included with your Daysy.

Daysy 1.0: The battery life of the battery we supply with your order is about 2 years. Daysy's activation ring will signal a weak battery with rapid blinking. Please exchange the battery within 2 days as instructed in the manual.

Daysy 2.0: A single battery charge will last 1 to 2 months, depending on how often you use your Daysy. To indicate that the battery is nearly empty, the activation ring on your Daysy will flash at frequent intervals. Make sure you charge the battery within a week.

If Daysy finishes a measurement by vibrating, repeat the measurement. Make sure to hold Daysy still and your mouth closed while you take your temperature. Please note the cable cannot be inserted into Daysy while recording a reading.

No. Daysy records all your data and keeps it safe. If you have synchronized Daysy with DaysyView, you can also store your data online to keep it safe in case Daysy gets lost or stolen. If that happens, please contact customer service.

No, since you measure below the tongue, these factors have no influence on the measurement.

If necessary, clean Daysy's sensor tip with a soft, damp cloth and mild detergent. Daysy is not waterproof. You can also find all relevant information on cleaning Daysy in the manual.

Please contact your local distributor for replacement parts.

If for some reason, the increase in temperature is very low, Daysy will switch to displaying red days for a longer period, before switching to yellow days and, eventually, back to green days. A low rise in temperature can be an indication of a hormonal condition. During anovulatory cycles, no rise in temperature is registered because ovulation did not occur. Corpus luteum insufficiency (CLI) is another possible reason for a low or indeterminable rise in temperature because the body doesn't produce sufficient progesterone to make the basal body temperature (BBT) rise. Menopausal women can also register lower increases in temperature, because their estradiol and progesterone values are declining.

Not really. On average, a woman's temperature increases by 0.3 degrees. If yours rises by more than 0.5 degrees on average, please contact our customer service.

Daysy 1.0: The battery should not be removed for any reason. If Daysy's battery loses contact, it will stay yellow until the next menstruation is entered. The data you have already saved within Daysy is still there.

Daysy 2.0: Daysy does not have an accessible battery compartment. Please do not attempt to open your device or remove the battery as this will automatically void the warranty.

Please contact your local customer service.

Please use a coin and turn the cap counter-clockwise to open the battery compartment.

Daysy 1.0: Make sure that you are following the correct order of steps to facilitate synchronization. Please contact your local customer service team if you have further trouble.

Daysy 2.0: Please make sure that Bluetooth® is enabled on your device and on your Daysy. To enable Bluetooth® on your Daysy, wake Daysy up and press the activation button twice (blue light blinking). Now select the Sync button in the top right corner of the app to start the synchronization process. Daysy is communicating with the app when the blue light remains illuminated. If the blue light on Daysy keeps blinking, please check the Bluetooth® mode on your phone again. If you have further trouble, please contact your customer support team.

Please contact your local customer service to discuss next steps.

Daysy 1.0: Yes, use an adapter that fits your smartphone, but stick with Daysy's connecting cable.

Daysy 2.0: Yes, Daysy now syncs to your smartphone or tablet via Bluetooth®, so you don't need an audio outlet to sync with DaysyView.