App Store
Natural Cycles Fertility App
Trusted by 3M+ women over 10 years. Awarded Best Birth Control app by Healthline and Bestapp.com. 100% hormone-free contraception. No prescription is needed. Scientifically proven to be 93% effective with typical use and 98% effective with perfect use. FDA cleared.
HIGHLIGHTS:
○ The NC° app uses your body temperature to track ovulation so you know exactly when you're fertile – and what days you can/cannot get pregnant.
○ The NC° app adapts to your unique cycle, even if it’s irregular.
○ No hormones, no side effects, no pills or procedures – birth control revolutionized.
○ Scientifically proven to be effective: 93% effective with typical use, and 98% effective with perfect use.
○ Sign up to NC° Annual subscription for a FREE NC° Band, and start measuring today!
○ Offers advanced data protection.
○ Get daily fertility insights + personal ovulatory patterns to help with your natural family planning needs.
○ The NC° app features customizable mood trackers, great for getting to know your body better.
○ Measure your temperature by wearing an Oura Ring or Apple Watch Series 8 or newer (while you sleep), or with the NC° Band.
○ Get reimbursed for your NC° subscription – US users are now covered by insurance.
○ We recommend a minimum of 2-3 cycles to get the most out of your Natural Cycles subscription.
○ Natural Cycles requires a subscription to access its core features. Subscription options include monthly and annual plans.
○ Our subscription fee helps to protect you and your data. Many free apps work by selling their users’ data to third parties for advertising. Your privacy is a priority. Natural Cycles is designed to keep your data safe.
Natural Cycles is more than a period tracker. Most other fertility tracking apps assume your cycle is 28 days long, even though 87% of women have cycle lengths that don't fit into the 28 day pattern... We understand that birth control is not a one-size-fits-all. Your cycle is unique to you! Our algorithm uses personalized temperature data to confirm your ovulation, reducing the risk of you being assigned an incorrect fertile day. Unlike period trackers, the NC° app allows you to identify your fertility status daily, so you can prevent pregnancy or plan for it with greater precision.
From birth control to planning pregnancy and every cycle in between – Natural Cycles is there for you with each stage of your fertility journey. Still not sure? Download the app and test out our Demo Mode. The app supports syncing with Apple Health.
*E. Berglund Scherwitzl et al. “Perfect-use and typical-use Pearl Index of a contraceptive mobile app”, Contraception, Volume 96, Issue 6, 420 - 425.
PRECAUTIONS:
○ 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, there is still a chance of getting pregnant.
○ Natural Cycles is for women over the age of 18.
○ Natural Cycles is available as a method of birth control in the US, Europe, Canada, Australia and Singapore. In countries outside the US, Europe, Canada, Australia and Singapore, Natural Cycles is intended to be used for fertility monitoring.
○ To use Natural Cycles, you need to understand English or one of the supported languages.
○ Before making any medical decisions, remember to consult with a doctor.
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Developer & User Discourse
Josieastrid • Apr 3, 2026
★ 5
Growing up, I thought taking your temperature to track fertility was an old wives tale. Access to this kind of data and information about my cycle has been transformative.
Sesminnie • Apr 2, 2026
Natural Cycles has helped me easily learn the patterns of my body and my cycle. Creates a lot of peace of mind for me! Would recommend!
Niecehelena • Apr 2, 2026
Of course it’s another one of those stupid apps that all they want is your money and your information. I’m totally not okay with that. Please take my word for it.
lila.kat • Apr 2, 2026
Everything is stuck behind a pay wall. Why do I need to pay a stupid amount of money to track my period. It’s terrible that women have to go through a normal body experience then have to pay to keep track of it. Would not recommend!!
Too Sexy For You 😍 • Apr 1, 2026
This app is designed to use your temperature every morning to determine fertility (ovulation). Every single month, it has ovulation showing for the 16-17th of the cycle. I know for a fact I ovulate earlier than that, & no matter how much data you add, the dates never change…how effective. It’s too expensive for it to not even be tracking anything…find something better, ladies.
StephNickname26 • Mar 30, 2026
Got pregnant using it perfectly as a preventative measure.
sad sad sad! sad • Mar 29, 2026
I like this app for the detailed insight of fertility windows. However it’s hard to use the thermometer per their instructions if you sleep poorly often / have kids waking you up multiple times. It’s hard to meet their temp taking requirements! The battery lasts about a year in the meter it’s self which is nice. So, with the temp taking reqs being ridged I find getting accurate consistent results to be tough.
Tiffany_4366 • Mar 29, 2026
It seems that since I’m unable to log periods myself this app can’t track whether a cycle is happening, even with an Oura ring. It claims to be able to, but it hasn’t yet. I was charged for the year without being allowed to cancel and customer service has been unhelpful. This app has zero functionality for me.
LannieDee • Mar 29, 2026
Everytime I try to snap a pic of my ovulation test, it’s super blurry
Vbdh24 • Mar 25, 2026
I have been using natural cycles for a year now as birth control and have had no scares. I love that it’s completely natural and I don’t have to do anything harmful to my body
Tatum Jo • Mar 25, 2026
I started using Natural Cycles when the pandemic started and I couldn’t get in to see my doctor for my BC. My boyfriend (now husband) and I agreed to get off of it and use the tracking app. I loved it for preventing, and I loved it for when we started trying to get pregnant.
Mads2334 • Mar 25, 2026
I had been on hormonal birth control for 15+ years and so eager to go off of it but nervous about how I would effectively track my cycle and have safe sex. This app has been amazing! The user experience is wonderful and there’s great educational resources. I’m a huge fan!
AngiePangiePan • Mar 24, 2026
I struggled to keep up with my cycle at first, but once I got an oura ring to sync with the app, it became super easy. I love getting a notification that my period is approaching and just not needing to deal with external hormones in my body. Highly recommend the app!!
wtfbroughomg • Mar 23, 2026
After the app allowed me to fully set up, taking all of my personal information, it wouldn’t let me get past the wearable device section without paying. terrible!
gskeihl • Mar 23, 2026
After being on every form of birth control for the last 16 years, I’m thrilled with Natural Cycles. I have learned SO MUCH about my body. I have it paired with Oura ring and its membership was reimbursed by my health insurance!
Amygal34 • Mar 22, 2026
I stopped taking hormonal birth control and switched to natural cycles a few months ago. It’s effective and easy to use. The temperature band is super easy and comfortable. The bonus I didnt expect or know I wanted was that I feel much more connected to my body! It’s really nice to see why I have cramps or am feeling down.
173950281 • Mar 22, 2026
Can’t say enough good things!
Ndincinema • Mar 21, 2026
I have a sensitivity to artificial hormonal regimens, and this app has empowered me to know what is happening with my cycle to assist with many applications. Yes for family planning very helpful. But, as someone that suffers from an autoimmune condition that is driven by hormonal shifts, this app has provided insights into what is happening during my cycle, such that I can anticipate and attempt to mitigate flare ups during the Luteal phase.
Highly recommend for all possible understanding of what is happening in a woman’s cycle and plan accordingly.
Highly recommend for all possible understanding of what is happening in a woman’s cycle and plan accordingly.
Mrkrum • Mar 21, 2026
I will continue to subscribe to this app forever, it has been the most helpful and functional app I’ve ever used. I was on birth control for 15 years, and have been able to be safely off it for years thanks specifically to this app and my Oura ring.
Sanderson941 • Mar 21, 2026
I’ve been using natural cycles for over 3 years now, and it has never failed me! It’s easy to use, easy to track my cycle phases & wonderful for sending me notifications about what cycle I’m in & what’s up coming! Might I add, I’ve been using it as a birth control method this entire time & it has never been anything but accurate for my husband and I. When you’re new it does take a few months for the app to get your cycle figured out, but when it does it’s on point!
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