The Best Ovulation Predictor Kits

What are Ovulation Predictor Kits?

Ovulation Predictor Kits help women track their menstrual cycles and identify their fertile window. These are the days when a woman is most likely to conceive, and this six day window includes the day of ovulation and the five days before it. By timing intercourse during the fertile window, couples can drastically increase their chances of getting pregnant.

Ovulation Predictor Kits are tests which can be taken in the comfort of your home. They can work in different ways but overall they are a convenient and effective way to boost your chances of getting pregnant naturally.

How do Ovulation Predictor Kits work?

There has been a recent boom in the availability and variety of Ovulation Predictor Kits and they can work using a variety of methods.

Many Ovulation Predictor Kits detect the levels of Luteinising Hormone, or LH, in your urine. The level of LH is typically low throughout your menstrual cycle, but it drastically rises when a developing egg follicle is large enough.

This LH surge triggers the release of a mature egg cell approximately 24 to 36 hours later in a process known as ovulation. Once an egg cell is released it can only survive for 24 hours and after this, the fertile window is over.

The most budget-friendly Ovulation Predictor Kits require you to urinate into a cup or onto test sticks, like you would for a pregnancy test. At the higher end of the price scale, there are Ovulation Predictor Kits which connect to your phone via Bluetooth and wearable fertility trackers.

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These fertility trackers can monitor many different indicators to predict your fertile window. One key marker is temperature, also known as Basal Body Temperature, which rises shortly after ovulation due to the actions of another hormone called progesterone.

Which Ovulation Predictor Kits are the best?

There is a lot of choice available on the market and it can be confusing to decide which product is the best for you. Personal preference is a key part of your decision so it is a good idea to think about which method of measurement you would feel most comfortable with.

We have rounded up a selection of the best Ovulation Predictor Kits on the market and simplified the key information you need to know to help you decide which product to choose.


Ava is a clever piece of kit which consists of a bracelet and an app. The bracelet collects information about your body while you sleep. In the morning, you can sync the bracelet with the mobile app to predict the five most fertile days in your cycle.

The lightweight bracelet gathers details about your skin temperature, pulse rate, perfusion, breathing rate and heart rate variability ratio. The breadth and depth of information collected by the Ava bracelet contributes to the ability of the app”s Artificial Intelligence algorithm to predict your fertile window with 90% accuracy.

This is supported by Ava”s scientific research. In a study including data from 237 women who used Ava for one year or until they became pregnant, the results showed that Ava was able to predict the fertile window with 90% accuracy1 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. Although this study was not independently carried out and instead involved scientists from Ava, the results are still very promising.

Furthermore Ava is able to give you real- time insights into your fertility. Unlike some other Ovulation Predictor Kits which can only tell you that you have ovulated after it has occurred, Ava”s Artificial Intelligence tells you in real time where you currently are in your cycle. This helps you to time intercourse during your fertile window. Ava can also be used during pregnancy to monitor your weight, sleep and stress levels.

Ava needs to be used regularly in order for the algorithm to work. This means that you need to wear the bracelet for at least 80% of the days in your cycle to get accurate results. Ava is also sensitive to factors which affect its readings such as excess alcohol, drugs or fever.

Ava also only works for women who have regular cycles which have a similar length. This means that Ava is unsuitable for women who have Polycystic Ovary Syndrome (PCOS) or women who are taking hormonal birth control.

It is an expensive option at £249.00 although this is a one-time purchase without the need for refill packs, as is the case with other Ovulation Predictor Kits.


– No refill kits required

– Can be useful during pregnancy


– Only works for regular cycles

– Expensive

Best for:

– In-depth analysis of your cycle.

Click here to buy Ava.


Mira is an innovative fertility tracker which analyses your urine for key hormones. It does this through a clever little analyser gadget and the Mira app.

Mira measures the levels of luteinising hormone (LH) and oestrogen in your urine in the form of testing sticks. You would need to insert the stick into the analyser which uses high precision fluorescence-based testing and transmits your results to the Mira app via Bluetooth.

Mira uses its Artificial Intelligence algorithms to analyse your hormone levels, learn about your cycle and detect your full fertile window of six days. This is more than many other methods of fertility analysis and it is an excellent feature giving you a greater insight into the best times to try for a baby.

Another key advantage of Mira is that it provides you with numerical values for your LH and oestrogen levels. This is important as it allows Mira to analyse your cycle regardless of your baseline levels of these hormones. This makes Mira suitable for women who have irregular cycles which includes women with PCOS.

Mira has a high level of accuracy of over 99%. But in order to get accurate results, you need to test your urine at the same time each day and limit your fluid intake for two hours before the test. Mira recommends taking the test first thing in the morning to get the most reliable results.

Mira costs £179.00 for the analyser and 10 test wands. Test wands are also available separately in the form of refill kits consisting of 20 test wands for £59.00.


– Provides your full six day fertile window

– Suitable for women with irregular cycles e.g. PCOS


– Need to buy refill kits

– Expensive

Best for:

Irregular cycles.

Click here to buy Mira.


Femometer works by measuring your BBT (basal body temperature) orally. This involves using a thermometer which syncs to the Femometer app via Bluetooth. The app is able to present insights into your cycle and your fertile window.

Femometer requires you to measure your temperature first thing in the morning to log it at its lowest. You need to hold the thermometer under your tongue for three seconds until it beeps. Femometer then analyses your data and it is able to pinpoint the start of your fertile window after three cycles, although it does not specify the length of the fertile window it can predict.

Femometer is highly precise and accurate, measuring to 1/10th of a degree in Fahrenheit or 1/100th of a degree in Celsius. However Femometer does not specify how accurate its device is at predicting the fertile window overall, although the numerous positive reviews suggest that the predictions are accurate.

The Femometer app is versatile as you can input more than just temperature data. The Femometer app allows you to enter data about your LH levels, which you can test using a separate inexpensive test kit. You can also add data about your cervical mucus and the Femometer app can combine all of this information to generate an estimate of your fertile window.

Femometer costs £29.99 and you do not need to purchase any refill kits.


– Discrete and stylish

– Convenient to use


– Only measures temperature unless you separately purchase LH tests

– Unclear how accurately it predicts the fertile window

Best for:


Click here to buy Femometer.

Clearblue Digital Ovulation Test

The Clearblue Digital Ovulation Test works similarly to a pregnancy test. It consists of a digital holder and test sticks which analyse your urine and measure the levels of the hormone LH.

The Clearblue Digital Ovulation Test is easy to use as you have the option of either testing your urine directly on the stick or collecting your urine into a cup and dipping the stick in. The stick detects the level of LH in your urine and the results are straightforward to read.

The digital display shows a smiling face if you are experiencing your LH surge. This means that you are in your fertile window. But if an empty circle is displayed this means that no LH surge is detected, so you would need to test again the following day using a new stick. However the test does not provide any numerical value or specific details about the level of LH detected.

The Clearblue Digital Ovulation Test has a high accuracy level of over 99%. However it only detects two days of your fertile window, giving you a short amount of time to act based on the results. The test is also not suitable for women with PCOS.

The Clearblue Digital Ovulation Test costs £14.90 and includes a digital holder and 10 test sticks.


– Budget friendly

– Accurate


– Only predicts 2 fertile days

– Requires refill kits

Best for:

Being budget friendly.

Click here to buy the Clearblue Digital Ovulation Test.


There are a range of Ovulation Predictor Kits available and it is important to take your time and think about which one you would feel comfortable incorporating into your daily routine.

If you looking for a budget-friendly option, the Clearblue Digital Ovulation Test is reasonably priced and accurate. But if you are happy to spend more to find out detailed information about your cycles, Ava is a clever piece of tech which you can use throughout conception and pregnancy.

For women with irregular cycles or PCOS, Mira is your best option to get accurate results and your full six day fertile window, regardless of your baseline hormone levels. If you are looking for a convenient and hassle-free way to analyse your cycle without taking urine tests or wearing a device, then Femometer is a good option for you.


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