How Ava works
There are six days a cycle when it’s possible to conceive. Ava is clinically tested to recognize five of them. It's easy.Overnight, the Ava sensor bracelet collects continuous data while you sleep.
In the morning, sync your bracelet to the app, and Ava’s algorithm instantly shows your results.
Ava pinpoints your five best days to try for a baby as they're taking place.
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Skin TemperatureDecreases by about 0.2°C after menstruation before rising 0.4°C after ovulation, remaining elevated until your next period begins.
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Resting Pulse RateDrops by about 1.5 beats during the follicular (pre-ovulation) phase, before increasing through the fertile window and peaking in the luteal (post-ovulation) phase.
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Heart Rate Variability RatioTypically rises in the follicular phase and falls in the luteal phase. It’s an indicator of physiological stress, with a higher ratio suggesting the body is under greater duress.
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PerfusionIs the passage of blood through the circulatory system. It’s lowest at the start of the fertile window and highest in the luteal phase and during menstruation.
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Breathing RateMeasures lower at the start of the fertile window and higher in the late luteal phase.
At work while you sleep
For consistent readings, the Ava sensor bracelet goes to work overnight while your body is at rest.
As it records your physiological parameters, it also tracks movement with a built-in accelerometer. This signal allows it to measure your sleep quantity (duration) and quality (percentage of combined deep and REM sleep).
Is Ava right for me?
The below is intended as a guideline. For more detailed questions about whether Ava is right for you, visit our FAQs and consult with your physician.
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Yes: Your cycle is regular and between 24–35 days
Ava will work with cycles slightly shorter or longer than the 28-day average, provided they are of consistent length.
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Yes: You have endometriosis
Ava can be used with endometriosis, unless there is severe scarring that interrupts ovulation.
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Yes: You're using an alternate conception method
Ava can be used to time conception methods other than intercourse, e.g. artificial insemination.
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Yes: You’re breastfeeding
Ava can be used while breastfeeding once your cycle has returned.
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No: You’re taking hormonal birth control
Ava works by sensing physiological changes related to your natural hormone levels.
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No: Your cycle length varies significantly from month to month
Ava has not been tested on women with irregular cycles that vary widely in length.
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No: You're looking for contraception
Ava has not been designed nor tested for pregnancy prevention.