Ava Fertility Tracker Review

The Ava fertility tracker is an innovative and unique way for women to track their menstrual cycles.

Through the use of the Ava bracelet, the Ava fertility tracker gathers information about your body while you sleep and tells you when your fertile window is.

We have created this comprehensive Ava fertility tracker review so you can get an objective opinion on its value for money.

Who is Ava suitable for?

Women who want to know more about their bodies

Ava closely monitors your menstrual cycle, and it is a reliable way to track your periods. It even adjusts when your period is due according to the measurements it takes.

By tracking your cycle, Ava also helps you make sense of the hormonal changes happening in your body each month. These can affect your mood, sleep and even hunger.

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Women trying to conceive

Timing is really crucial when you are trying to conceive. The Ava fertility tracker aims to maximise your chances of conceiving by calculating your fertile days accurately.

Ava calculates five fertile days per month when it is most likely that you will conceive. Ava is also useful as it tells you when these days are in real-time. This helps you know exactly when you should be trying for a baby.

Women during pregnancy

Pregnancy can be a scary time for any mum-to-be, and with all the changes happening in your body it can be difficult to keep track of them. Ava can help you to monitor your weight, stress levels, and sleep. Ava also describes the changes you can expect to go through during each stage of pregnancy and what is happening in your baby”s development each week.

How does Ava work?

Ava works through a combination of a bracelet and a mobile app. The Ava bracelet is a simple sensor on a strap which you wear at night time while you sleep. While you are resting, the bracelet is hard at work collecting information 25 times every second.

When you wake up in the morning, you will need to sync your bracelet to your mobile app to transfer the information across. The app is available on both the App store and Google Play. The app processes the information from the bracelet with the help of Ava”s four algorithms, and it presents you with insights about your body.

What does the Ava bracelet measure?

Through the sensors in the bracelet, Ava tracks the five physiological signs of fertility:

Skin temperature

Your body temperature varies during your cycle. Basal body temperature (BBT) is your temperature when you are resting, and this is a common method of predicting a woman”s fertile window.

Ava measures skin temperature which falls slightly after menstruation, by around 0.2°C. When you ovulate, the levels of hormones in your body change. Your progesterone level in particular rises.

This causes a slight increase in skin temperature by approximately 0.4°C. This higher temperature lasts for the rest of the cycle.


A woman’s resting pulse rate tends to drop slightly in the lead up to ovulation. The pulse then rises during the fertile window.

The resting pulse is highest during the luteal phase, which happens after ovulation and before your period. During this time, the uterus wall thickens in preparation for a pregnancy.

Heart rate variability ratio

Heart rate variability measures how much the time between each heart beat differs. This is a complex idea, but essentially it reflects physiological stress. If the ratio is higher, the body is under more pressure.

This ratio naturally changes with a woman’s cycle. It generally rises in the lead up to ovulation, and it falls after ovulation.

Breathing rate

The number of breaths you take per minute is generally lower at the beginning of the fertile window. This rises to its maximum level in the late luteal phase, right before a woman’s period.


This means the flow of blood around the body, and this is essential to deliver the nutrients the cells need and to take away any waste products. This tends to be lower at the start of the fertile window and it rises after ovulation.

Other measurements

In addition to the physiological markers of fertility above, the Ava bracelet contains an accelerometer. This means that it can detect movement, and this is how Ava can analyse your sleep. Ava can provide you with information about how long you sleep and the quality of your sleep.

How accurate is Ava?

Ava is backed by scientific evidence and numerous clinical trials. The research is thorough and it shows that the Ava bracelet is able to effectively gather the key data needed to predict a woman”s fertile days.

A recent study conducted in 2019 in Zurich analysed how well Ava worked. The scientists studied data from 237 women and they found that Ava’s algorithms could detect the fertile window with an impressive accuracy of 90% 1 Goodale BM, Shilaih M, Falco L, Dammeier F, Hamvas G, Leeners B. Wearable Sensors Reveal Menses-Driven Changes in Physiology and Enable Prediction of the Fertile Window: Observational Study. Journal of Medical Internet Research. 2019. 21(4): e13404.

However it is important to note that the scientists involved in this study also worked for Ava. This is a financial conflict of interest which the scientists openly declare in the study.

Ava works closely with scientists to improve the product and its accuracy, and it is committed to scientific research and development. The company uses 20% of each sale of an Ava bracelet towards women’s health research.

Ava performs better than other methods of tracking fertility

Real-time insights

A major advantage of using Ava is that you have real-time insights into your fertility. This allows you to act when you can actually maximise your chances of conceiving.

Other methods such as BBT thermometers can be difficult to keep track of. The data is best analysed after you have ovulated and seen your temperature spike, but by this time your fertile window may have passed.

The only other method which can tell you whether you are ovulating in real time is a urine LH (luteinizing hormone) stick test. But this does not tell you as much information about your body as Ava does.

Ava detects five fertile days

In a woman’s cycle, the day that she ovulates and the five days before it are the fertile window. Ava is able to predict five of the six fertile days consistently.

This is more than other tests are able to predict. Urine LH stick tests are only able to predict one or two fertile days.

Is Ava convenient to use?

Although it may take some getting used to, Ava is convenient to use. You only need to wear the bracelet at night, and it is so small and light that it should not bother you even if you are a light sleeper.

The only thing you do need to remember to do is charge the Ava bracelet. The bracelet is supplied with a USB cable for charging.

The manufacturers recommend that you charge Ava during the day when you are not using it so that it is ready for you at night. The bracelet also has a convenient LED light to alert you when it needs charging.

Ava needs commitment

Ava learns from your body, so you need to provide it with enough data to be able to understand how your body works. This means that it is only effective if it receives data for at least 80% of the days in your cycle.

Ava also needs to be worn for at least four hours every night. Additionally, it needs a minimum of three hours of sleep recorded each night.

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Alcohol can affect Ava”s readings

Ava is sensitive to any changes in your normal routine which affect how your body works. Therefore it is fine to use Ava if you normally have a glass of wine with a meal as your body has become used to this, and the amount of alcohol consumed is not excessive.

However the scientists behind Ava warn that if you consume an excessive amount of alcohol or drugs, then this can affect the normal processes occurring in your body. Specifically this can affect your resting heart rate therefore this will alter Ava”s results and reduce its accuracy.

If you have consumed an excessive amount of alcohol or drugs, the manufacturers recommend that you avoid wearing Ava during that night. The same applies if you have a fever or flu as this can affect your skin temperature and heart rate too.

Ava is not suitable for all women

Ava relies on detecting changes in the body within certain limits. Therefore in the following cases, Ava will not be able to provide accurate information:

Women who are taking hormonal birth control – because their hormone levels will not follow the natural trends.

Women who have polycystic ovary syndrome (PCOS) or hypothalamic amenorrhoea – these conditions interrupt the process of ovulation and Ava is not able to analyse data without regular ovulation.

Women with very irregular cycles which vary drastically in length – Ava”s algorithms cannot factor in these changes in the data. However Ava does work if cycles only vary slightly from the 28 day average cycle length and the cycle length is consistent.

How much does Ava cost?

Ava costs £249 and it is available to buy directly on the Ava website here. It is also available from many online retailers and high street stores.

Ava is more expensive than normal period tracking apps. But it is also a great deal cheaper than seeing a fertility specialist and the subsequent treatment, which can run into thousands of pounds. It is a good idea to try your best to conceive naturally first and Ava maximises your chances of doing this.


At first glance Ava is an expensive piece of equipment, however one might argue that both the anxiety caused by the uncertainty of your own fertility and the cost of fertility treatment is much more expensive.

Ava is unlike any other product available on the market. Its price reflects the amount and variety of information it collects which have been supported by rigorous scientific research.

As a result of this, Ava is highly accurate at pinpointing the fertile window in a woman”s cycle. It is also convenient to use, although it does take some getting used to.

Our recommendation

Use Ava if you have been trying to conceive naturally for at least six months. This is when Ava will be most useful, as it can identify your most fertile days and when you should be trying to conceive. It will also provide you with useful data about your cycles which you can show to your fertility doctor if you continue to have problems conceiving.


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