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OvuSense ovulation tracker OvuSense ovulation tracker
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Ovulation Tracker and Cycle Monitor

Unique fertility and cycle monitoring that works for all cycle types.

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Introducing the OvuSense fertility monitoring service

Predicts and Confirms Ovulation

OvuSense is the only fertility monitoring solution which predicts AND confirms ovulation using your current cycle data.

That's essential for understanding when to try to conceive.

Continuous monitoring

OvuSense monitors your cycles continuously, and provides unique insights for your cycle characteristics.

That's essential if you're trying to monitor the effect of your nutrition, and any medications you're taking.

Award winning support

Our 24/7 award winning customer support team, and free fertility nursing service help you manage your journey.

So, unlike other ovulation trackers and fertility monitors, we're with you every step of the way.

Know your exact ovulation date

OvuSense is the only comprehensive continuous cycle monitoring system available on the market.

It is clinically proven to predict your ovulation up to 24 hours in advance using current cycle data, and it gets it right 96% of the time. It then confirms your exact date of ovulation with 99% accuracy.

I want to track my ovulation
doctors in lab
happy woman and partner looking at phone

Supporting your journey, every step of the way

Trying to conceive naturally?

OvuSense predicts and confirms your ovulation, in real time, from the very first cycle of use. It then show you an 8 day fertile window at the start of each cycle. That information tells you exactly when to try and conceive, and 92% of our customers say it reduces their TTC stress by helping them take control.

Struggling with Polycystic Ovarian Syndrome?

The symptoms of PCOS affect one in five women worldwide.

Because it predicts ovulation in real time, OvuSense is clinically proven to work if you have PCOS, and a number of other common issues like under or over-active thyroid, endometriosis or irregular cycles. By monitoring continuously, OvuSense also shows you exactly what's happening throughout the rest of your cycle - crucial information to help you conceive, and stay in control of your issues.

woman resting head on hand
woman sat on couch with partner's arm around her shoulder

Consulting with a doctor

Continuous cycle monitoring is the key.

Our patent protected AI-powered fertility monitor OvuSense Pro, provides a simple to use dashboard and enhanced reporting for you and your doctor. It helps your doctor screen for common issues that affect your cycles, and to accurately monitor the impact of diet and treatment on your body.

What makes OvuSense different?

OvuSense is the only fertility and ovulation monitor available that predicts your ovulation in real time using current cycle data and confirms your ovulation with 99% accuracy. That's why it could help you get pregnant up to 15 months faster than other devices.

What makes OvuSense different?

OvuSense is the only fertility and ovulation monitor available that predicts your ovulation in real time using current cycle data and confirms your ovulation with 99% accuracy. That's why it could help you get pregnant up to 15 months faster than other devices.

  Fertility Tracker Apps Skin and Basal Temperature Urine Kits and Monitors OvuSense
 
Fertility Tracker Apps
Basal & Skin Temperature
Urine Tests and Monitors
OvuSense
Predicts ovulation

 92% 96%
Confirms ovulation

 21% 78% 99%
Fertile window days

 4 6 2-6 8
PCOS +Irregular Cycles
Screen for issues
Track diet and drugs
Click for more
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OvuFirst

How does it work?

The OvuFirst sensor works with the OvuSense App. You wear it on your skin overnight, using our specially designed armband to hold it under the armpit, or wristband to hold it on the underside of your wrist.

What are the benefits?

The patent protected OvuFirst Sensor solves some of these issues caused by other methods by taking multiple overnight skin temperature measurements using an identical set of components to our revolutionary patent protected OvuCore Sensor technology: it has a thermistor with a resolution of 0.003 degrees Celsius [a], the OvuFirst algorithm intelligently filters the data avoiding the problems caused by 'dropouts' experienced by other skin based monitors, and then applies smoothing techniques to provide the clearest possible curve provided by a skin measuring method. Using the OvuFirst Sensor, your OvuSense App confirms the ovulation window with suggested date of ovulation with over 90% accuracy [b, c].

Added to the accuracy of skin temperature measurement, there's no messy urine strips, no confusing charts with multiple parameters, and no need to remember to test.

Clinical Publications

[a] The measuring resolution of a thermometer is the step between each temperature reading - a resolution of a normal 0.1 degree Celsius means a reading may be wrong by as much as 0.099 degrees Celsius, or in other words there are only 3 steps between a wrong and right ovulation result of 0.3 degrees Celsius rise, whereas 0.003 degrees resolution provides 100 steps.

[b] The accuracy measures how many positive and absent ovulations the device confirms correctly.

[c] The clinical proof for OvuFirst is provided by a side by side study of the OvuFirst sensor with vaginal core body temperature measured using the OvuCore sensor (2022) - Hurst BS, Davies K (2022) Novel Technique for Confirmation of the Day of Ovulation and Prediction of Ovulation. Bioeng. Biotechnol., 04 March 2022..

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OvuSense

How does it work?

The OvuCore sensor works with the OvuSense App. OvuCore is similar in size to a tampon and is placed in your vagina overnight. It's proven easy to use and comfortable to wear in clinical publications and over 235,000 cycles of use. [a]

What are the benefits?

The patent protected OvuCore Sensor technology solves the issues caused by other methods by taking multiple overnight continuous Core Body Temperature (cCBT) measurements in the vagina using a thermistor with a resolution of 0.003 degrees Celsius [b], the OvuSense algorithm intelligently filters the data, and then applies smoothing techniques to provide a clear curve and the truest representation of the action of progesterone on the ovaries. Using the OvuCore Sensor, your OvuSense App confirms the date of ovulation with 99% accuracy [c][e]. Unlike the other methods it is also able to predict ovulation in real time - the published literature shows it does this with an accuracy of 89% and a positive predictive value of 96% [d][e].

Clinical Publications

[a] The comfort and ease of use of OvuCore is documented in the following clinical paper: Papaioannou S, Aslam M (2013) User’s acceptability of Ovusense: a novel vaginal temperature sensor for prediction of the fertile period. J Obstet Gynaecol 33:705–9. .

[b] The measuring resolution of a thermometer is the step between each temperature reading - a resolution of a normal 0.1 degree Celsius means a reading may be wrong by as much as 0.099 degrees Celsius, or in other words there are only 3 steps between a wrong and right ovulation result of 0.3 degrees Celsius rise, whereas 0.003 degrees resolution provides 100 steps.

[c] The accuracy measures how many positive and absent ovulations the device confirms correctly.

[d] The positive predictive value measures how many of the real time predicted ovulations OvuSense gets right.

[e] The accuracy of ovulation confirmation by OvuSense is based on the data set originally published at the 2013 ASRM meeting as a quality index: Papaioannou S, Aslam M (2013), and developed in the key publication outlining the accuracy and positive predictive value of advance prediction of ovulation shown at the 2014 ESHRE meeting: Papaioannou S, Delkos D, Pardey J (2014).

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Fertility Tracker Apps

How do they work?

Fertility Tracker Apps (FTAs) use the calendar based method of tracking. You input the dates of your period and the app will calculate your ovulation based on the assumption that you have 'middle of the month' ovulation. Some have more sophisticated algorithms which accept manually entered oral temperatures, or Ovulation Predictor Kit (Luteinizing Hormone) test results.

How close will the results be compared to OvuSense?

Even though Fertility Tracker Apps (FTAs) sometimes allow you to enter information other than just your period dates, they are not able to pinpoint the date of ovulation with useful accuracy because they are based on the assumption that all women have very regular cycles with ovulation that occurs in the 'middle of the month' Of all the methods for looking at your ovulation you need to know that FTAs are the least reliable, and you should really ignore the results they produce if you're struggling to conceive.

What are the benefits?

Fertility apps are convenient and a handy way of tracking the basic information in your cycle. They help you stay organised and often feature useful extra information to help with conception and pregnancy.

What are the drawbacks?

Clinical studies show that 70% of women don’t ovulate in the middle of their cycle, and you can ovulate at a different time from cycle to cycle, even if your cycles are always the same length [1]. A recent study into several fertility apps concluded 'as a result of the physiological variations of the menstrual cycle length and ovulation day, the fertile window cannot be predicted easily, and it has to be determined during the ongoing cycle. Therefore, to help couples wishing to conceive, apps based on data from previous cycles alone are not suitable to indicate the most fertile days' [2]. Another recent study concluded 'accuracy of ovulation prediction [using previous cycle data] was no better than 21%' [3]. Other studies have drawn similar conclusions [4].

[1] Baird D, McConnaughey D (1995); Lenton EA, Landgren BM (1984a); Lenton EA, Landgren BM (1984b)
[2] Freis A, Freundl-Schütt T (2018)
[3] Johnson S, Marriott L (2018)
[4] Freundl G, Godehardt E (2003); Moglia ML, Nguyen HV (2016); Wise LA, Hatch EE (2015)

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Basal Body Temperature (BBT)

How does it work?

Long established in the clinical literature [1], the BBT method aims to help detect the date of ovulation in a cycle by taking the basal (lowest) temperature first thing on waking with an oral thermometer, and then charting the change in this daily temperature throughout the month to determine the date of ovulation. It can also be used if you have regular ovulation for predicting the fertile window in the next cycle. Because a rise in temperature is associated with the release of progesterone which occurs during ovulation, a predictable pattern emerges for most women which can help confirm ovulation took place over a number of cycles.

How close will the results be compared to OvuSense?

Even though the Basal Body Temperature (BBT) method uses temperature as a basis for confirming if ovulation took place, it relies on very different measuring technology from the patented protected system used by OvuSense. Oral thermometers only have an accuracy of around 0.1 degrees Celsius [a] so are not easily able to detect the 0.3 degree rise associated with ovulation with accuracy. Even if you type the values you get with your thermometer into a Fertility Tracker App they are likely to give a different ovulation result from OvuSense. You should also be aware that a vaginal temperature measured using the OvuCore Sensor is generally up to two degrees Celsius higher than temperature readings taken in the mouth, and higher still than external temperature readings such as those taken under the armpit or on the wrist. Lastly, OvuSense uses proprietary algorithms to detect ovulation, so it can produce very different results even with similar looking temperature curves.

What are the benefits?

BBT is a relatively cheap and easy way to track your temperatures and a number of apps are now available which combine the idea of a single oral temperature with automatic charting. It is more effective if combined with cervical mucus tracking.

What are the drawbacks?

Clinical studies show that 70% of women don’t ovulate in the middle of their cycle, and you can ovulate at a different time from cycle to cycle, even if your cycles are always the same length [2]. As a result because BBT relies on predicting the fertile window based on past cycle data, it's of little practical use if you don't ovulate at the same time each month. With or without an app to help, BBT is unable to help predict ovulation using the current cycle data. Again, even with an app, some users find the charting cumbersome and have difficulty taking a valid measurement each day. Studies assess accuracy for confirmation that ovulation took place at around 69%-78%[3].

[1] Barrett JC Marshall J (1969); McCarthy and Rockette (1983) [2] Baird D, McConnaughey D (1995) Lenton EA, Landgren BM (1984a); Lenton EA, Landgren BM (1984b) [3] Freundl G, Godehardt E (2003); Barron M L Fehring R (2005); Bauman JE (1981)

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Basal & Skin Temperature, including Fetility Bracelets, Watches, Rings

How do they work?

A more modern application of the BBT method is to take several consecutive temperature measurements from the skin - either under the armpit, under the bra strap or on your wrist - at various intervals overnight, and then download and interpret these measurements on an app. Some of these devices record additional secondary parameters.

How close will the results be compared to OvuSense?

Even though Skin Worn/ Fertility Bracelet Devices (SW/ FB) use skin temperature as a basis for confirming if ovulation took place, they rely on very different measuring technology from the patented protected system used by OvuSense. They also use different algorithm methods, and you therefore shouldn't expect them to give you the same temperature or ovulation results. You should also be aware that a vaginal temperature measured using the OvuCore Sensor is generally up to two degrees Celsius higher than temperature readings taken in the mouth, and higher still than external temperature readings such as those taken under the armpit or on the wrist.

What are the benefits?

As with the BBT method, a skin worn device is a relatively easy way to track your temperatures and it's often more convenient. The devices help establish the pattern of temperature over time, and because of the volume of measurements, they are possibly a little more consistent in detecting ovulation than BBT with an oral thermometer.

What are the drawbacks?

Measuring temperature at the skin also has some negative aspects for devices that have not been optimised through side by side clinical testing with 'gold standard' methods. Firstly, the skin temperature tends to vary in opposition to core temperature changes associated with the release of progesterone, and secondly there is a high chance of 'dropouts' in the temperature signal because it's difficult to maintain contact between the skin and sensor consistently. Just as with BBT, these devices rely on predicting the fertile window based on past cycle data, so they are more suited to women with regular cycles.[2] They are unable to predict ovulation using current cycle data. There are no current papers assessing accuracy of the ability to confirm the date of ovulation, but published data for a wrist worn device shows a sensitivity of 81% (missing around 19% of ovulations) and an ability to confirm that ovulation took place within a fertile window (though not on which day) with a 'F score' of 0.78 which indicates 78% accuracy [3].

[1] Barrett JC Marshall J (1969); McCarthey and Rockette (1983)
[2] Baird D, McConnaughey D (1995); Lenton EA, Landgren BM (1984a); Lenton EA, Landgren BM (1984b)
[3] Goodale BM, Shilaih M (2019)

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Urine Kits and Monitors, also known as Ovulation Predictor Kits/ Monitors

How do they work?

Ovulation Predictor Kits (OPKs) provide a positive test for Luteinizing Hormone (LH) using a urine test strip. Ovulation Prediction Monitors (OPMs) usually allow multiple ovulation predictor urine strip results to be combined to provide a monitoring picture of Luteinizing Hormone (LH) over a cycle. Some monitors use a urine strip that combines LH with E3G - a metabolite that allows assessment of the estradiol level.

How close will the results be compared to OvuSense?

Firstly, OPKs and OPMs are only able to provide a prediction of when ovulation may occur during the current cycle. They are not able to confirm you have ovulated, and because of the lack of confirmation they cannot be used to reliably predict your fertile window for the next cycle. When you're using the OvuCore Sensor your OvuSense App will also provide you with a prediction of when you are about to ovulate using the current cycle data. As this is based on the temperature pattern caused by the release of progesterone associated with ovulation, rather than luteizing hormone, it may well provide you with a different prediction. This is particularly true if you have an ovulatory issue such as PCOS which is known to interfere with OPK and OPM results. However, if your OvuSense App and an OPK or OPM predict the same day for ovulation then this can be very useful in confirming your hormone behaviour throughout the cycle.

What are the benefits?

LH peaks up to a day in advance of ovulation so OPKs and OPMs are helpful in providing a short term indication of when you should try and conceive based on your current cycle data. They work well at predicting ovulation for most women that have regular 'middle of the month' ovulation. The addition of E3G with OPMs helps provide a fertile window prediction and storing multiple results in the monitor helps with the convenience and monitoring over time compared with OPKs.

What are the drawbacks?

OPKs are known to give false positive results for women with PCOS and other ovulatory issues [1]. They sometimes also give false negative results, which can be based on the cutoff point of the test, or simply that the test is not optimised for the natural level of LH for the particular user. OPKs can only provide a snapshot at one point in time in your cycle, meaning you have to use a minimum of two tests a day over a 10-20 range in each cycle to monitor where you are in your cycle. The manufacturers make valid claims for 99% accuracy in detecting LH, but the accuracy estimates for correct advance prediction of ovulation are 70%-84% depending on the publication [2]. OPKs and OPMs are unable to confirm the date of ovulation or if you haven't ovulated. They are sometimes thought to be messy, impractical and the cost quickly adds up. Lastly, they cannot be used for clinical monitoring as they only provide a picture up to the point of ovulation and no understanding of what happens during ovulation itself, and the luteal phase.

[1] McGovern PG, Myers ER (2004)
[2] Irons DW, Singh M (1994); Lloyd R, Coulman CB (1989);

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Serum Progesterone (SP)

How does it work?

A serum blood progesterone measurement generally should be obtained approximately one week before the expected onset of the next menses [1] and in a 28 day cycle that's day 21 which is why the test is often called a '21-day progesterone'.

How close will the results be compared to OvuSense?

Serum progesterone is a standard method for confirming ovulation took place that is used by medical professionals throughout the world. It's reliable if your blood is drawn on the right day in your cycle, but it doesn't really provide an accurate day on which ovulation occurred, just a good assessment that it has occurred within a recent window of 5-10 days. If you OvuSense App confirmation fits within that window then it's a good sign but you shouldn't necessarily expect agreement between the results, and very importantly a negative serum progesterone result doesn't necessarily mean you haven't ovulated, particularly if OvuSense shows you have.

What are the benefits?

If timed correctly, a serum blood progestrone is an excellent way of confirming that you have definitely ovulatied in the current cycle. If it is used regularly in successive cycles it can help build up a picture of your ovulation which confirms home testing.

What are the drawbacks?

There is a real practical problem if you have irregular cycles or are in the 70% of women who ovulate at a different time in your cycle from the expected ‘norm’[2], or if you just don't have time to get in to have your blood drawn. Given that a false negative test can occur if the timing of your blood draw is out by even a day, a serum blood progesterone can also lead to the wrong conclusion – potentially setting you on a course of unnecessary treatment.

[1] ASRM (2012) Diagnostic evaluation of the infertile female.; Fertility Assessment and Treatment of people with fertility problems.
[2] Baird D, McConnaughey D (1995); Lenton EA, Landgren BM (1984a); Lenton EA, Landgren BM (1984b)

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Ultrasound (US)

How does it work?

3-4 ultrasound 'folliculometry' scans per cycle is the suggested requirement of good cycle monitoring. Your clinician will usually be looking for a dominant follicle (the next one that is most likely to rupture resulting in ovulation) of 20mm or more in size in one of your ovaries. This measurement means that you are likely to ovulate in the next 24-48 hours.

How close will the results be compared to OvuSense?

Ultrasound 'folliculometry' is the accepted 'gold standard' assessment of ovulation as it's the only method which actually 'shows' ovulation about to take place or that it has taken place. It is really important to understand the prediction your doctor gives you when saying you are going to ovulate having completed an ultrasound is based on an assessment of the size of your 'dominant follicle' which is assumed to be the same for all women. This means ovulation can occur in a window of 12-72 hours after your scan, or in fact may not occur at all, and the only way to confirm this is to go back for more scans in the same cycle. Ideally if you have a scan on one day and the follicle hasn't 'ruptured', and you have another scan on the next day and it has, then you know you ovulated in between - otherwise it can only be used as a guideline for the ovulation window.

What are the benefits?

If timed correctly, ultrasound 'folliculmetry' is the accepted gold standard for confirming the likelihood of ovulation in a cycle [1]. It is also essential in assessing the growth and number of follicles, particularly during stimulation of the ovaries, and vital in diagnosis of ovarian issues such as PCOS.

What are the drawbacks?

Ultrasound ‘folliculometry’ is not always a good predictor of ovulation, and this isn’t surprising given that it assumes that all women of whatever size and shape, or hormonal make-up will have identically sized follicles just before ovulation occurs. Dominant follicle size can vary greatly [2]. Katiyar et al. (2018) reported on the ability of ultrasound folliculometry to predict ovulation in 100 infertile women, concluding folliculometry predicted ovulation with an accuracy of 86% with a specificity of 58.6% and a sensitivity of 98.6% [3]. Also, because a scan is a snapshot at one point in time in your cycle, timing the scan correctly is essential, and a number are needed in cycles where the timing of ovulation needs to be known. This is often impractical for the patient and the clinic.

[1] ASRM (2012) Diagnostic evaluation of the infertile female.; NICE (2004). Fertility Assessment and Treatment of people with fertility problems.
[2] Vlaisavljević V, Došen M (2007)
[3] Katiyar S, Arya S (2018)

How does OvuSense work

OvuSense ovulation tracker is a class 2 medical grade sensor. Sleep with the fertility monitor in place and use the OvuSense app to gain valuable insights into your ovulation cycles.

Learn your body's cycles with 4 easy steps

1 OvuSense App on a smartphone

Download the OvuSense App to your phone

2 Clock image

Monitor your cycle as you sleep

3 OvuSense App data updating

Automatically sync data from sensor to the app

4 OvuSense charts in the mobile app

Intelligent dashboards give you valuable insights

Benefits of using OvuSense ovulation tracker

99% accuracy confirming ovulation

99% accuracy confirming ovulation

Up to 15 months quicker to achieve conception

Up to 15 months quicker to achieve conception

Simple easy to use app tracks ovulation for you

Simple easy to use app tracks ovulation for you

No mess, no confusion, unlike urine strips

No mess, no confusion, unlike urine strips

Clinically proven with scientific research

Clinically proven with scientific research

Works for all types of ovulation cycles

Works for all types of ovulation cycles

Shop now for OvuSense >>

The Science Behind OvuSense

OvuSense is a class 2 medical device, and is backed by a decade of science, research and evidence. It is clinically proven in trials to increase the likelihood of getting pregnant. It all starts with knowing your body, knowing your cycle, to give you the best chance of conceiving.

OvuSense fertility monitor is able to confirm ovulation with 99% accuracy. it achieves this using the patented OvuCore sensor, which intelligently measures overnight continuous Core Body Temperature (cCBT). cCBT shows you exactly what is happening to progesterone during your cycle. When progesterone rises, your cCBT rises, and as progesterone is released during ovulation OvuSense is able to measure that rise to tell you when you ovulated. Not only that but the OvuCore sensor is able to see when ovulation is going to happen during the cycle, so it will predict ovulation up to 24 hours in advance. That's particularly helpful if you have variable ovulation timing

At the start of your next cycle, OvuSense provides you with an 8 day fertile window, compared to other methods which can only show 3-6 days. So, OvuSense maximizes your chance of pregnancy.

doctors in lab

The best fertility monitor for irregular cycles

Our patent protected monitor has also been clinically proven to offer women with irregular cycles the same level of accuracy as those on regular cycles. It is important to know that urine strips, also know as ovulation predictor kits, sometimes just don't work if you have irregular cycles.

Women suffering with polycystic ovarian syndrome (PCOS), diminished ovarian reserve or thyroid issues are most likely to experience irregular cycles, but there are also many women with PCOS and other issues who have a regular cycle but irregular ovulation. OvuSense makes tracking these cycles simple and highly accurate, giving you the best chance of conception out of any product available on the market if you have an ovulatory problem due to one of these issues.

OvuSense tracks the direct effect of progesterone on the ovaries, and that's why it is able to predict and confirm ovulation with such a high degree of success.

Read more clinical research on OvuSense

The best ovulation tracker for only €25 a month

OvuSense comes in three simple pricing plans to suit your budget

Pay Monthly

€25
a month
€125 up front
Flexible recurring payment options
Cancel when you get pregnant or want to stop
Add to Cart

Pay Annually

€289
12 months access
Save 60% versus Monthly option
12 months access to download data from your sensor*
Free fertility nurse consultation after 3 months
Add to Cart

One Off Payment

€399
Lifetime access
Best value for your entire fertility journey
Permanent access to download data from your sensor*
Free fertility nurse consultation after 3 months
OvuSense® Pro AI-powered cycle pattern analysis
Remote monitoring for your doctor
Add to Cart

* Sensors can be used for 12 consecutive months. Replacement sensor can be purchased at cost price.

Click here to check out the terms of our free OvuCore advanced vaginal sensor guarantee.

Need some more answers on how OvuSense ovulation tracker works and what it can do for you?

Our handy FAQ section aims to answer some of the most common questions we get about our fertility monitor.

Read our FAQ section

OvuSense real life success stories

Over the years OvuSense has helped hundreds of women around the world achieve the miracle of conception. We are proud to share our customer success stories of those who trusted OvuSense to support them along their pregnancy journey.

"OvuSense was the reason behind my baby"

During this journey, I struggled, but in the end it all paid off! OvuSense customer service and its undivided support has been better than I could have ever asked for. I truly believe OvuSense was the reason behind my baby!

Cheyenne

Cheyenne and partner
Rachel and partner

"OvuSense was invaluable"

I have PCOS, hypothyroid and Hashimoto’s. I started using OvuSense after many previous years of TTC unsuccessfully and we conceived our miracle baby on cycle 12 . The information that I learned about my cycle by using OvuSense was invaluable.

Rachel

"OvuSense gave me hope"

I started by using ovulation strips and that was a waste of money, I never had a static smiley face. When I got OvuSense, I was already trying for 7 months with no luck at all but OvuSense gave me hope because it showed I WAS ovulating. Now I’m pregnant with my baby boy. Lisa

Lisa

Lisa and partner

As featured in...

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Womens fitness
Made for Mums
Mother & Baby
Essential baby
Female First
Fertility Road
The Fertility Show
Lorraine
The Times
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The Mail on Sunday
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