A Smarter Way to Track Your Cycle


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Ava Fertility Tracker

Ava is unlike any other method of tracking your cycle. It’s a sensor bracelet, worn only at night, that monitors subtle physiological changes your body undergoes throughout the month. Using unprecedented technology, Ava detects your fertile window in real-time during your current cycle.

Ava makes tracking your monthly cycle more precise and effortless than it has ever been before. On top of that, it provides insight into your sleep patterns and stress levels.

  • Fertile and non-fertile days
  • Ovulation
  • Resting heart rate
  • Basal body temperature
  • Physiological stress level
  • How much you sleep each night
  • Light and deep sleep ratio
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What Ava Measures

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.

What Makes Ava Different

It’s smart.

While you sleep, Ava’s sensors gather data about your temperature, heart rate, metabolism, and more. 

It’s convenient.

Wear Ava at night and sync it in the morning—that’s it. 

It’s enlightening.

Ava gives you cycle insight that’s not available with any other form of tracking. 

Know Your Body

“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.”

– Scary Mommy

Whether you’re trying to conceive or simply want to get in closer touch with your body, Ava is an easier and more accurate way to track your cycle.

Until now, the only way to figure out when you ovulated was to use a combination of temperature charting, cervical mucus monitoring, and OPKs. Ava liberates women from the hassle and confusion of triangulating between multiple methods of fertility tracking by tracking everything in a single device—all while you’re asleep.

And unlike other fertility monitoring devices, Ava tracks your sleep and stress levels.

With Ava, You Can…

  • See how your changing hormone levels impact your wellbeing throughout the month
  • Learn how your cycle works so that when you want to get pregnant, you know exactly the best time to try
  • See how much—and how well—you sleep each night, with data about deep sleep, light sleep, and total hours slept
  • Track your body’s stress levels—not just emotional stress that you feel, but physiological signs of stress that affect you whether you realize it or not
  • Gain insight about your menstrual cycle
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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, the leading expert on the mathematical modeling of menstrual cycles.

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 leading peer-reviewed journal in reproductive health by the end of 2016.

Learn more about how Ava works.

Get Your Ava

Ava Fertility Tracker

We’re so grateful for the overwhelming interest we’ve received since we launched. Due to high demand, Ava does not ship for 8 – 12 weeks after ordering. Order now to secure your place in the shipping queue.

Once it ships, it takes 1 – 2 days. Shipping costs $3.55 in the U.S.

Purchasing Ava is no risk: if you get pregnant or change your mind before your Ava ships, just let us know. We’ll cancel your order and refund your credit card, no questions asked.

Take charge of your cycle with Ava.

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