Natural Cycles birth control app works better with wearables


For years, an app referred to as Natural Cycles has been aiding ladies in monitoring their ovulation cycles as a type of contraception. To make use of it, ladies should manually enter their temperature on the similar time each morning. It’s a cumbersome course of that, if not adopted strictly, could result in undesirable being pregnant. Now, the corporate has accomplished a proof-of-concept research displaying that its app may be paired with a wearable to constantly monitor temperature information and different physique indicators for efficient being pregnant prevention. Wearables could lastly make Natural Cycles’s hormone-free birth control extra compelling to ladies and well being specialists alike.

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[Photo: courtesy of Natural Cycles]

Integrating wearables into the app’s expertise could assist individuals keep on high of the tactic, which requires strict and common temperature-taking to work successfully. The Meals and Drug Administration has signed off, clearing the app to be used with wearable thermometers. Lately, period-tracking app Clue received FDA clearance to be used as a type of contraception. Traditionally, fertility-awareness-based strategies—like interval and temperature-tracking—have been discovered to have a 25% fail fee. Each Clue and Natural Cycles say their app-based monitoring is simpler.

Elina Berglund, CEO and cofounder of Natural Cycles, insists that the app’s use of temperature to estimate ovulation is distinct. “Interval trackers are very totally different, as a result of they don’t know while you ovulate—they only guess that it’s someplace in the midst of your cycle,” she says. “We actually detect ovulation in your temperature curve and from that calculate when it’s actually secure to not use safety.” 

In its authentic incarnation, Natural Cycles would ask ladies to take their temperature on the similar time each morning with a view to generate a map of their particular person cycle. Basal physique temperature, or the physique’s temperature after sleep and simply earlier than exercise, reaches a low two days earlier than ovulation. It additionally rises barely after ovulation. Primarily based on these fluctuations, Natural Cycles recommends when it’s okay to have intercourse with out safety and when customers ought to both abstain or use a condom. The corporate first obtained FDA medical system clearance for its app in 2018, and it prices $90 per yr to make use of (or $10 per thirty days).


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CEO Elina Berglund [Photo: courtesy of Natural Cycles]

Natural Cycles has now studied using the app in conjunction with the Oura Ring, a wearable that information physique temperature and coronary heart fee as a part of its general sleep-tracking performance. A abstract of the research says the Natural Cycles algorithm was in a position to predict when a girl was ovulating utilizing the temperature information from the Oura Ring. This information was measured in opposition to at-home ovulation check strips that point out whether or not an individual’s ranges of luteinizing hormone are surging, which occurs forward of ovulation. Utilizing the Oura Ring, Natural Cycles was in a position to better predict non-fertile days, because it famous in its software to the FDA.

The corporate has obtained criticism from specialists for its strategy over issues that its technique just isn’t efficient sufficient. Natural Cycles has revealed several studies testing its efficacy. With typical use (not good use), the app is 93% efficient, which is on par with hormonal strategies. (Intrauterine gadgets are the best type of contraception with 99% efficacy.) Nonetheless, some experts argue it’s not simple to trace physique indicators, and a few apps don’t go far sufficient to show ladies comply with not solely temperature, but additionally different signifiers of ovulation like cervical mucus. Moreover, they are saying, there are already well-known and confirmed strategies of contraception out there to ladies which are simpler.

The app has some 2 million customers, and the corporate says that charges of being pregnant amongst customers are constant with its efficacy fee. However this has not stopped individuals from getting upset after they have an unintended being pregnant whereas utilizing the app. In 2018, 37 women in Sweden reported the app to the nation’s Medical Merchandise Company after they by chance conceived whereas utilizing Natural Cycles.

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[Photo: courtesy of Natural Cycles]

Basal temperature alone is probably not the very best predictor of ovulation. Temperature can fluctuate based mostly on a wide range of elements, together with sickness, stress, and whether or not or not a girl has had a glass of wine or two. Already, Natural Cycles permits ladies to incorporate information from hormone check strips. However wearables could present much more information—coronary heart fee information, particularly—that may assist enhance Natural Cycles’s potential to foretell fertile days.

“Getting the guts fee information may be very helpful, as a result of then now we have particular expertise that we will use to appropriate the temperature based mostly on the guts fee information,” Berglund says, noting that by viewing each coronary heart fee information and temperature information over time, the app’s algorithms are better in a position to distinguish whether or not an individual’s temperature peaked as a result of they have been consuming the night time earlier than or as a result of they have been ovulating.

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[Photo: courtesy of Natural Cycles]

Berglund began Natural Cycles in 2013 as a result of she needed to get off of hormonal birth control. Previous to founding the corporate, Berglund was working as a particle physicist at CERN, the European Group for Nuclear Analysis, and was on the group that found the Higgs boson, an elusive however key particle wanted to validate the Commonplace Mannequin of particle physics, a scientific concept that describes the fundamental constructing blocks of the universe. Berglund began the corporate with her husband, who can also be a physicist.


The corporate is presently testing which wearables it can finally combine with. Berglund says she is aware of that Oura Ring works, however continues to be different choices. For now there isn’t any timeframe for when it can launch a model of the app that’s suitable with wearable gadgets.

Along with testing third-party gadgets just like the Oura Ring, the corporate is creating its personal wearable system that may observe temperature. “The tip imaginative and prescient is that if we might measure hormones instantly within the blood,” Berglund says, “however the expertise just isn’t there in the present day.”