Natural Cycles: Natural Birth Control | No Hormones or Side Effects

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Is Natural Cycles° right for you?

Let's get to know you

What can we help you with?

Prevent pregnancy Prevent now, plan later Get pregnant faster Track my pregnancy Recover from childbirth Haven't decided yet

How it works

Choose a device

Use our free thermometer when you sign up. Or sync our app with your Apple Watch or Oura Ring.

Take your temperature

Use your chosen device to take your temperature right when you wake up.

Open the Natural Cycles app

The app shows you your fertility status, cycle trends, and helpful insights.

NC Devices

Measure with NC

Holding NC App

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How effective are other forms of birth control?

NON-HORMONAL

Natural Cycles°

Natural Cycles App

93%

Copper IUD

Copper IUD

99%

Condom

Condom

87%

HORMONAL

Hormonal IUD

Hormonal IUD

99%

Vaginal Ring

Vaginal Ring

93%

Contraceptive Pill

Contraceptive pills

93%

Reference: Contraceptive Technology (Table 26 - 1). 21st Edition, 2018

Backed by science, the Natural Cycles° algorithm is powered by your body temperature.

Inside the app

unlock

Unlock

Our FDA Cleared algorithm uses your temperature to identify fertile and non-fertile days.

trackers

Track

Log mood, energy, and more to see how your cycle impacts you.

ovulation prediction

Learn

Customized insights and expert content to help you understand your unique experience.

Hear directly from Cyclers like you

4.8

40K+ ratings in the App Store

Michelle

Michele

I feel empowered knowing about my body’s natural processes.

Bethany

Bethany

I’ve experienced significantly less pelvic pain... and our intimacy couldn’t be better.

Dr. Katara

Dr. Katara

Has got to be THE best natural birth control on the market. 10/10 recommend!

Shadow

Shadow

NC° helped me understand my body, cycle, and the best time of the month to get pregnant.

Katie

Katie and her family

Nothing short of amazing! We just welcomed our baby girl thanks to NC° 🥰

Join Our Community

#NaturalCycles

The need for accessible educational resources is more urgent than ever. A recent BPAS survey revealed that nearly half of UK women face significant barriers to accessing contraception, including long wait times for appointments 😞 Follow the link in our bio to learn more about what we are doing to address these challenges 💪🔗⁠

There has been some previous research done on the effect of the moon on the menstrual cycle 🌕 but the results have been varied, and the studies themselves have been quite small in size, i.e., on relatively few participants each time. Thanks to our Cyclers, who have given consent for us to use their anonymized data for research, Natural Cycles has access to lots of cycle data from many different women over many lunar phases 📲 This enables us to look into these types of topics further and investigate small effects that can only be seen in large data sets.⁠
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In this study, the Natural Cycles Research Team worked with renowned researchers in the field, to investigate if the moon (meaning the rhythm of the lunar cycle) has any effect on when menstruation starts 🩸 Additionally, they also set out to analyze if a weekly biological rhythm, aka the circaseptan rhythm, (which has been described in previous research) has any effect on this.⁠
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We analyzed 311,064 cycles from 35,940 anonymous Natural Cycles users collected between 2019-2021 🔬 The aim was to investigate the timing of when menstruation started in relation to the weekly rhythm (meaning which weekday menstruation started), and in relation to the different lunar phases (in which lunar phase menstruation started) 🔍 The analysis also took age, cycle length, and season into account. Follow the link in our bio to learn more about our findings 🔗

The effectiveness of Natural Cycles remains the same whether you use an oral basal thermometer, the Oura Ring or an Apple Watch. Natural Cycles is 93% effective with typical use and 98% effective with perfect use 💜⁠⁠
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Natural Cycles’ effectiveness rates across all devices are closely monitored 🔍 Measuring devices cannot and should not be compared 🙅 This is why two measuring devices (even if the same type of device) cannot be used at the same time.⁠⁠ Switching at the start of your next period will make for a smoother transition with fewer Red Days and allow you to continue using Natural Cycles with your other device until the beginning of your next cycle 🩸

Our Cyclers are our motivators 🫂💜⁠
Thank you @jessicalouread for sharing your unique experience with us ✨
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Natural Cycles is 93% effective with typical use, 98% effective with perfect use.

Common questions

What’s the difference between Natural Cycles and other fertility apps?

How do I get started?

How much does it cost to use Natural Cycles?

Is Natural Cycles effective birth control?

You must be over the age of 18.Does not protect against STIs.

FDA Cleared

Natural Cycles is 93% effective with typical use, 98% effective with perfect use. No method of contraception is 100% effective. Natural Cycles does not guarantee that you cannot get pregnant, it only informs you whether and when you can become pregnant based on the information that you enter into the application.