Natural Cycles - Birth Control

17.7K reviews
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About this app

Choose Natural Cycles - the only birth control app that is cleared by the FDA in the US and CE-marked in Europe as a medical device - and take birth control into your own hands.

Particle physicist Dr. Elina Berglund initially developed Natural Cycles to offer women an effective, non-hormonal method of birth control. The app identifies ovulation by analyzing basal body temperature, letting you know when you're fertile and when you’re not. Natural Cycles is different from fertility and period trackers, as it is a clinically proven birth control option, alongside the pill, IUD and the condom.

What you get with Natural Cycles

○ Effectiveness - the app is FDA-cleared in the US and CE-marked in Europe
○ Knowledge of when you're fertile and when you're not
○ Reliable ovulation detection and predictions
○ Personal insights around your cycle, enabled by our proprietary algorithm
○ Useful notifications including PMS alerts and when your period is due

Birth control effectiveness

Natural Cycles is 93% effective with typical use, and 98% effective with perfect use. The clinical study that determined Natural Cycles' effectiveness is one of the largest of its kind, with 15,000 women and 600,000 menstrual cycles. It was peer reviewed and published in the renowned journal Contraception.*

For added context, the pill is 91% effective with typical use and >99% with perfect use, and the IUD is one of the most effective form of birth control, with both typical and perfect use >99%. That said, there is no 'one size fits all' and the choice of birth control is very individual from woman to woman.

Our Story

Natural Cycles was founded by the couple Dr. Elina Berglund and Dr. Raoul Scherwitzl, who wanted an effective method of birth control that was hormone-free and non-invasive. As a former member of the European Organisation for Nuclear Research (CERN), Elina was part of the team that discovered the Higgs Boson particle – one of the most significant discoveries in particle physics, that went on to win a Nobel Prize.

Using the techniques she had learned through the Higgs Boson project, Elina created an algorithm to analyze temperature readings, taking factors like sperm survival, temperature fluctuations, variations in cycle length, ovulation day, and the length of the follicular and luteal phase into account to identify fertile and non-fertile days. Raoul suggested that they would turn the fertility algorithm into an app, to allow other couples to benefit from their innovation. Natural Cycles was born.

Pricing plans

○ Yearly plan: $89.99/year.
○ Monthly plan: $9.99/month.
○ A subscription is needed to use the app. A free demo mode is available.


○ Natural Cycles does not protect against sexually transmitted infections (STIs). Use a condom to protect against STIs.
○ No method of birth control is 100% effective, even when using the birth control app perfectly you can still have an unintended pregnancy.
○ Natural Cycles is for women over the age of 18.
○ Natural Cycles is only available as a method of birth control in the US and in Europe.
○ To use Natural Cycles, you need to understand English or one of the supported languages.

Before you start using Natural Cycles, read the User Manual, Terms of Use and Privacy Policy.
User Manual
Terms of Use
Privacy Policy

*E. Berglund Scherwitzl et al. “Perfect-use and typical-use Pearl Index of a contraceptive mobile app”, Contraception, Volume 96, Issue 6, 420 - 425.
Updated on
May 3, 2022

Data safety

Developers can show information here about how their app collects and uses your data. Learn more about data safety
No information available

Ratings and reviews

17.7K reviews
Lucinda Stevenson
May 8, 2022
This has so much potential, perhaps second or third generations will be good but this one is not. My main issue is that the thermometer does not sync with the app (the whole point I previously thought) the thermometer doesn't even light up and is so difficult to use in the dark (the moment you wake up, groggy and fumbling no less). The app is also not designed well, I've had free period tracker apps that were easier to use.
1 person found this review helpful
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NaturalCycles AG
May 11, 2022
Hi Lucinda, thank you for posting a review and we’re sorry to hear that your experience was not of the quality you expected.We are working hard on finding a new thermometer. As a certified contraceptive in the EU and cleared by the FDA in the US, the quality controls for our products are very strict. Please let us know if we can help further.
Sarah Yingling
April 28, 2022
I haven't used it long enough to determine effectiveness but I believe the algorithm will do a good job determining when I'm fertile. The app is easy to use and understand. My complaint has to do with the thermometer. You are supposed to take temperature right when you wake up, but it doesn't have features like a back lit screen so you can see the result in the dark and it has 5 loud and jarring beeps that I try to hide under my pillow to not wake baby or husband. Both very annoying.
6 people found this review helpful
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NaturalCycles AG
April 28, 2022
Hi Sarah, We appreciate that you took the time to share your perspective with us as we are always looking for ways to improve. If you would like to elaborate more on this, we would love to hear your thoughts. Please reach out to us via Kind regards, Natural Cycles
Rachel Lane
April 6, 2022
Great app. I find it annoying the thermometer not only beeps really loudly (with no way to turn it off- it wakes my partner), and that it does not automatically sync up with the app. You have to type in your temp. The thermometer also does not have a screen that lights so if it's dark, you need a phone or flashlight to light up your screen. When you pay $80.00 for something, I expect it to be a little more seamless.
9 people found this review helpful
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What's new

Cycle smoother than ever with this updated version of the app!