Get more fertile days each month with Ava.


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If women can get an advanced heads up on when they’re going to ovulate, they’re more likely to be able to conceive.
Rather than only looking at a single factor of ovulation, like a urine ovulation test or the basal thermometer, the Ava has sensors that track nine different biological parameters.
The bracelet uses technology to solve one of the more
frustrating problems for some couples: getting pregnant.
Ava Fertility Tracker

Ava is a fertility tracking bracelet that identifies an average of five fertile days per cycle, doubling your chances to conceive. There’s no guesswork around timing intercourse or tracking ovulation. Wear Ava at night and the rest is taken care of—all that’s left for you to do is the fun part.

Whether you’ve just started trying to conceive or your fertility journey is taking longer than you expected, Ava can help. It gives you the confidence to always know you’re trying at the right time, and the convenience to not have to think about it too much. Ava makes for a better, easier, more magical journey to conception for you and your partner.


What makes Ava different?

It’s smart.

While you sleep, Ava’s sensors gather physiological data points to detect your fertile window.

It’s convenient.

Throw out your BBT thermometer and stop peeing on sticks. Wear Ava at night, and the rest is taken care of.

It gives you time.

Ava gives you in-cycle, real-time detection of five fertile days, so you and your partner can relax and enjoy the babymaking process.

I used to do BBT and the results were so confusing.
With Ava, it’s so much clearer.
Abby, 26
Ava being automatic makes me less obsessive about charting.
Rachel, 28
I like that I wear Ava when I sleep so people don’t see it and know we’re trying to get pregnant.
Nisha, 34

Where are you on the journey to a baby?

We’re not sure we’ll ever be able to conceive but we’re still trying.

We’ve been trying for a few months and are getting a little concerned.

We’re confident we’ll see a positive pregnancy test soon!

We’re still considering if pregnancy is right for us.

70 percent of pregnancies happen in the same three cycle days, and with Ava, it’s never been easier to find the fertile days in your cycle.

With Ava you can

  • Double your chances to conceive every month
  • Get five fertile days per cycle
  • Enjoy your entire fertile window with your partner—no need to rush.
  • Monitor your general health and wellness while you’re trying to conceive and throughout your pregnancy
  • Gain insight about your menstrual cycle

What Ava measures

Resting Pulse Rate

Pulse rate is an accurate estimation of how often your heart beats per minute (bpm). Typical resting pulse rates for adults are between 40 and 80 bpm, but if you get a lot of aerobic exercise, your resting pulse rate may be lower.
Pulse rate is an accurate estimation of how often your heart beats per minute (bpm). Typical resting pulse rates for adults are between 40 and 80 bpm, but if you get a lot of aerobic exercise, your resting pulse rate may be lower.
The temperature of your skin at your wrist. Even though your wrist skin temperature reading is lower than your oral temperature reading, it still provides a strong indication of your basal body temperature (BBT). During the night, your wrist skin temperature rises and your core body temperature falls. Both your core temperature and your wrist skin temperature rise by about one half of one degree Fahrenheit after ovulation.

Average skin temperature reading (when taken at room temperature of 64.5 – 77 degrees Fahrenheit) are between 90.68 and 98.24 degrees Fahrenheit. If you sleep in a room warmer than 77 degrees Fahrenheit, it could cause your skin temperature to go up.

HRV is the variation in the time interval from one heartbeat to the next. It can be used as an indicator of physiological stress.

Most people think of heart rate as the average number of beats per minute, but your heart rate changes from beat to beat. HRV measures this naturally occurring irregularity in heart rate. The more variation in the interval between beats, the lower your physiological stress level.

Ava measures the ratio between low frequency and high frequency waves in your heart rate. Scientific studies have shown that the HRV ratio is a good indicator to assess the balance between the sympathetic nervous system and the parasympathetic nervous system. An imbalance in these systems—usually when the sympathetic branch takes the upper hand—is associated with high physiological stress level and results in a high HRV ratio.

Estrogen and progesterone have an impact on HRV. The HRV ratio is increased during the luteal phase when progesterone peaks, compared with the follicular phase, when estrogen is high.

Normal HRV ratio varies widely from person to person, but by looking for an increase or decrease from your baseline HRV ratio, you can learn about your body’s physiological stress level. HRV ratio is complicated, but the important thing to remember that a higher HRV ratio indicates higher stress.

The quality and amount of sleep you’re getting each night are important parameters to track for your fertility. Your menstrual cycle can affect your sleep, and your sleep, in turn, can affect your menstrual cycle. Ava shows the total amount of sleep you get each night. This doesn’t count time you might spend reading in bed; the bracelet can distinguish between sleeping and lying quietly. It also tracks the percentage of light sleep and the percentage of combined deep and REM sleep.

Average percentages for adults are 47 – 60 percent light sleep and 33 – 48 percent deep sleep + REM.

Rate of respiration per minute.
Ava tracks your movement with an accelerometer. This parameter allows the bracelet distinguish between light and deep + REM sleep.
Perfusion describes the process of supplying blood to the tissues of your body. As blood flows through your capillaries, it delivers nutrients to the tissues and helps sweep away waste. Then, the blood flows back to the heart, and begins the process all over again.

If you’ve ever had an elastic band around your finger and felt the blood flow being cut off, you’re already familiar with the process of perfusion. While you can limit perfusion with an elastic band, perfusion can also change naturally for different reasons. For example, your perfusion changes in order to keep you warm or cool you down. Estrogen and progesterone also have an influence on perfusion. Estrogen increases perfusion, while progesterone has the opposite effect.

Bioimpedance measures the resistance of body tissue to tiny electric voltages. If you’ve ever measured your body composition such as fat content, this is very similar. Besides analyzing fat content, bioimpedance provides information about the skin, including hydration and sweating patterns.

As you have probably observed throughout your life, reproductive hormones have an impact on your skin. Your skin can change at different phases of the menstrual cycle, during puberty, and during pregnancy.

Heat loss is closely related to the onset of sleep. As you lose heat through your hands and feet, your skin temperature increases and your core body temperature decreases. This heat loss is closely related to the onset of sleepiness.

Heat loss is also related to your metabolic rate. The mechanism for the maintenance of the higher temperature during the luteal phase is still a matter of scientific discussion. Some researchers believe that reduced heat loss is responsible, while others believe that higher internal heat production (increased metabolic rate) is the cause.

The science behind Ava

Ava completed a year-long clinical study at the University Hospital of Zurich under the lead of Prof. Dr. Brigitte Leeners, a leading expert on the mathematical modeling of menstrual cycles. Ava was found to identify an average of 5.3 fertile days per cycle with an accuracy of 89 percent.

The results of the study were presented in June 2016 at the Swiss Society of Obstetrics and Gynecology Annual Congress and will be presented in October 2016 at the German Society of Obstetrics and Gynecology Annual Congress. Bayer, the leading women’s health company, is sponsoring Ava’s presentations.

Our scientific research paper will be submitted in summer 2016. We expect it to be published by a peer-reviewed journal in reproductive health by the end of 2016.

Learn more about how Ava works.

Ava works throughout pregnancy

With Ava, you’ll get vital details about your health not available through any other app. Wear Ava at night during your pregnancy to track your sleep quality, stress levels, and resting heart rate. And if you plan to have more children, you’ll have Ava to help you conceive for your next pregnancy.

Get your Ava

Ava Fertility Tracker

Take charge of your conception with Ava. No other method of fertility tracking gives you 5 in-cycle fertile days while also providing insight about sleep, stress, and resting heart rate.

If you become pregnant or change your mind at any time before Ava ships, contact us and we’ll cancel your order, no questions asked.


Learn more from our fertility experts

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