We include products we think are useful for our readers. If you buy through links on this page, we may earn a small commission. Here’s our process.

Medical News Today only shows you brands and products that we stand behind.

Our team thoroughly researches and evaluates the recommendations we make on our site. To establish that the product manufacturers addressed safety and efficacy standards, we:
  • Evaluate ingredients and composition: Do they have the potential to cause harm?
  • Fact-check all health claims: Do they align with the current body of scientific evidence?
  • Assess the brand: Does it operate with integrity and adhere to industry best practices?
We do the research so you can find trusted products for your health and wellness.
Was this helpful?

The Ava Fertility Tracker is an FDA-cleared wearable fertility device identifying a person’s most fertile days with up to 90% accuracy. The company offers three packages, all of which are available to buy online.

The Ava Fertility Tracker is a FDA-cleared wearable fertility tracker. Ava says it identifies the five most fertile days in a person’s menstrual cycle, which can help improve the chances of pregnancy.

This wearable looks like a watch or bracelet, and a person needs to wear it for at least four hours while they sleep. The device tracks signs of hormonal changes, such as:

  • skin temperature
  • resting pulse rate
  • blood circulation through tissues, which is called perfusion
  • breathing rate
  • heart rate variability

Ava says the tracker identifies fertile days with up to 90% accuracy. This knowledge can help a person plan whether to have sex that could lead to pregnancy on those days.

The device is suitable for people with cycles of 24–35 days.

Learn more about cycle length here.


  • Research indicates that the device tracks fertile days with more than 86% accuracy. However, during the study, the researchers were employed by Ava, so interpret this finding with caution.
  • The device is easy to use and operate, reviewers note.
  • There is no need to deal with urine, take temperature, or manually input data, as with other methods of fertility tracking.
  • The device can follow menstrual phases in real time, its makers say.
  • The device can monitor sleep patterns, as well as fertility, the company says.


  • The device is unsuitable for people with polycystic ovary syndrome (PCOS) or irregular cycles.
  • The device is more expensive than some other fertility trackers.
Was this helpful?

The Ava Fertility Tracker is a wearable medical device that predicts a person’s five most fertile days in their menstrual cycle. It works for individuals with regular menstrual cycles lasting 24–35 days.

The average menstrual cycle lasts 28 days. Ava Fertility can work for people with slightly shorter or longer cycles if their cycle length is consistent. The device may not work for people with cycles that last fewer than 24 days or more than 35 days.

A person can use the fertility tracker while nursing after their menstrual cycle has returned.

Ava Fertility Tracker can work for people with endometriosis as long as they do not have severe scarring that interferes with ovulation.

The device can also work to time conception for those using alternative methods of conception, such as artificial insemination.

The Ava Fertility Tracker will not work for people using hormonal birth control because it detects changes in natural hormone levels that these types of contraception disrupt. The device is also unsuitable for people with an implanted electronic device such as a pacemaker.

The Ava Fertility Tracker comes with:

  • a sensor pod
  • a bracelet
  • a USB charging cable

To start, a person needs to charge the pod and download the Ava app, which is available for free on iOS and Android devices.

After connecting the device to the app via Bluetooth, people must wear it regularly for at least 4 hours during sleep. The company recommends making sure that the sensor pod sits on top of the wrist. People can open Ava app on their phones daily to synchronize their data from the night before.

A person can start using the device right away. Depending on where a person is in their cycle, the device can predict a 5-day window of fertility and the date of the next menstrual period.

The Ava Fertility Tracker has a battery life of up to 12 hours.

Research demonstrates that the Ava Fertility Tracker’s technology perceives simultaneous changes in wrist skin temperature, heart rate, and respiratory rate that occur throughout the menstrual cycle.

The device’s machine learning algorithm is 90% accurate in determining a person’s five most fertile days.

However, the people involved in this research were either previous or current Ava employees or on the company’s board. This may prevent the results from being objective.

People can order the Ava Fertility Tracker online through the company’s website. A person may opt for one of three packages:

Ava Fertility Basic• Ava bracelet
• In-app cycle, fertility, and pregnancy tracking
• Membership in Ava’s online community
Ava Fertility Plus• Ava bracelet
• In-app cycle, fertility, and pregnancy tracking
• Membership in Ava’s online community
• Full refund if not pregnant within 12 months
Ultimate Guide to Getting Pregnant e-book
$30912-month money-back guarantee
Ava Fertility Premium• Ava bracelet
• In-app cycle, fertility, and pregnancy tracking
• Membership in Ava’s online community
• Full refund if not pregnant within 6 months
Ultimate Guide to Getting Pregnant e-book
$3596-month money-back guarantee


The company offers free shipping and delivery within 3–5 business days.

Ava currently ships to the United States, Canada, and certain countries in the European Union, as well as Switzerland and Lichenstein.

A person can sign up on Ava’s website to receive a notification when the company sells the device in their country.

Warranty and returns

A person can return their device within 30 days if it is in the original, unopened packaging. The company refunds the cost minus a $25 shipping and processing fee. After 30 days, the company does not accept returns or issue refunds.

Ava offers a 1-year limited warranty on manufacturing defects.

Ava does not currently hold accreditation with the Better Business Bureau (BBB). The BBB gives the company a B+ grade, and customers award it an average of 1 out of 5 stars. Reviewers on Trustpilot give Ava 3.7 out of 5 stars.

Positive user reviews say the device is easier to use and more convenient than ovulation test kits. Reviewers also mention accurate and effective period tracking. Some credit their pregnancies to the Ava tracker and praised the company’s customer service department.

Negative reviews mention inaccurate ovulation prediction and difficulty syncing data between the device and the Ava app. Others say that the device’s light was too bright during the night, and several users report that the bands broke soon after they started using their bracelets.

A person might consider other wearable fertility trackers, which are also available to buy online, including:


  • Price: from $35 per month
  • Measures: core temperature
  • How to use: insert the device into the vagina during sleep
  • Accuracy: detects ovulation date with 99% accuracy, according to the company

The OvuCore is a vaginal sensor. Unlike Ava, this tracker is suitable for people with PCOS and irregular periods., according to OvuSense. According to the company, it can confirm the date of ovulation with 99% accuracy.

The OvuCore provides live ovulation prediction, as well as medication tracking. A person inserts the device into their vagina during sleep and removes it when they wake up. People can also track other metrics, such as vaginal discharge and medications, through the companion app.


  • Price: $215
  • Measures: core temperature
  • How to use: wear the armband during sleep
  • Accuracy: no information

The Tempdrop is an FDA-cleared wearable device that tracks the body’s core temperature during sleep. People wear the armband on their upper arm, which syncs with the free companion app.

The company does not state how accurate this device is in detecting ovulation. Tempdrop recommends using this device alongside other fertility awareness methods to increase the chances of pregnancy.

The following table compares Ava to the alternatives in this article. Please note that all accuracy claims are from the manufacturer.

PriceMeasuresHow to useAccuracy
Avafrom $279• skin temperature
• heart rate
• perfusion
wear the bracelet during sleepup to 90%
OvuSensefrom $35 per monthcore temperatureinsert the device in the vagina during sleep99%
Tempdrop$215core temperaturewear the armband during sleepno information

Below are some common questions about the Ava Fertility Tracking bracelet.

Is the Ava Fertility Tracker worth it?

The Ava Fertility Tracker may be worth purchasing if a person prefers using noninvasive and simple methods of collecting metrics that can identify fertile windows.

A peer-reviewed clinical trial in 2019 found that this device was 90% accurate at identifying fertile days.

A 2021 study found that skin temperature, which the Ava device checks, was more effective at detecting ovulation than basal body temperature.

Is the Ava bracelet FDA approved?

No. However, the FDA cleared the Ava Fertility Tracker in January 2021.

How long does the Ava bracelet take to work?

The device needs to gather enough data in a given cycle to assess the cycle’s pattern accurately. The company says this can take around six days after a person’s estimated ovulation date.

If a person does not wear the device regularly, it may return inaccurate results. For this reason, the company recommends wearing the device every night.

How does Ava track fertility?

Ava measures several metrics, including skin temperature, heart rate, and blood circulation, over a period of time to determine when a person is most likely to be fertile.

The measurements will change as a person’s hormones fluctuate as part of their menstrual cycle, allowing the tracker to predict an ovulation window.

The Ava Fertility Tracker can notify people about their most fertile days. However, the company says that it is not suitable for people with PCOS or irregular periods and is not an effective method of birth control.

Other fertility devices are available to buy online. Anyone trying to conceive should discuss fertility strategies and planning for pregnancy with a healthcare professional.