# Natural Cycles: Fertility App — Ovulation Tracker・FDA-cleared

> Hormone-free fertility tracking and contraception app using body temperature. (iPhone/iPad app by NaturalCycles Nordic AB.)

- Source: https://appshunter.io/ios/app/natural-cycles-fertility-app/id765535549 (this page in markdown: same URL + `.md`)
- Developer: [NaturalCycles Nordic AB](https://appshunter.io/developer/765535552)
- Category: Health & Fitness, Medical
- Price: Free with in-app purchases
- Rating: 4.80/5 from 29,811 App Store ratings · 1,412 written reviews indexed
- Age rating: 17+
- Requires: iOS 16.7 · 139 MB
- Languages: American English, European Spanish, Brazilian Portuguese, Swedish
- Released: 2013-12-17
- Data updated: 2026-08-28
- Monetization: subscription
- User reviews in markdown: https://appshunter.io/ios/app/natural-cycles-fertility-app/id765535549/reviews.md

## What is Natural Cycles?

Trusted by 6M+ 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!
○ Learn how your sleep patterns change throughout each phase of your cycle.
○ Offers advanced data protection.
○ Get daily fertility insights + personal ovulatory patterns to help with your natural family planning needs.
○ One app, five modes: NC° Birth Control, NC° Plan Pregnancy, NC° Follow Pregnancy, NC° Postpartum, and NC° Perimenopause.
○ The NC° app features customizable mood trackers, great for getting to know your body better.
○ Measure your temperature using the NC° Band, or by wearing an Oura Ring, WHOOP, Apple Watch Series 8 or newer (while you sleep), or a compatible Garmin device.
○ 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. 


*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 authorized for use as birth control in the US, Canada, the UK, the EU/EEA, Australia, Singapore, Brazil, and South Korea. Outside these regions, the app is intended for fertility monitoring only.
○ 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.

Natural Cycles connects with Apple Health to read and write your health data, including medications, body temperature and cycle information.

## Key features

- Hormone-free contraception
- Ovulation tracking via temperature
- Personalized cycle adaptation
- Pregnancy planning and tracking
- Postpartum and perimenopause modes
- Mood tracking
- Data protection

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly with 7 day trial | $119.99 | per year |
| Monthly | $21.99 | per month |
| Annual | $149.99 | per year |
| Monthly | $28.49 | per month |
| Annual | $194.99 | per year |


## Chart rankings

- #99 in Top Free · Health & Fitness (US App Store)
- #30 in Top Grossing · Health & Fitness (US App Store)

## What do users think of Natural Cycles?

Overall sentiment: positive

**Pros**

- 👍 Teaches users about their cycle
- 👍 Helps users understand their body
- 👍 Provides a natural contraceptive option
- 👍 Accurate in predicting ovulation and periods
- 👍 Empowers users to take control of their fertility
- 👍 Improves mood and reduces side effects compared to hormonal birth control
- 👍 Useful for both preventing and planning pregnancy
- 👍 Detailed data and insights about user's cycle

**Cons**

- 🐛 Inconsistent in predicting ovulation and periods for some users
- 🐛 Thermometer issues (loud, hard to read, no Bluetooth connectivity)
- 🐛 Difficult to use for users with irregular cycles or disrupted sleep schedules
- 🐛 Lack of customer support responsiveness
- 🐛 Automatic subscription renewal issues and no refunds
- 🐛 Algorithm not always accurate, leading to unintended pregnancies
- 🐛 Cluttered and unintuitive app interface

**Commonly reported bugs**

- App functionality issues after updates
- Syncing problems between thermometer and app
- Inaccurate pregnancy and ovulation predictions

**Most requested features**

- Add ability to track additional symptoms and cycle data
- Integrate with other health tracking devices and apps
- Improve thermometer design and connectivity
- Provide more personalized cycle predictions and insights
- Enhance app design and user experience
- Offer more flexible subscription options

## Recent user reviews (10 of 1,412)

All indexed reviews: https://appshunter.io/ios/app/natural-cycles-fertility-app/id765535549/reviews.md

### 1/5 — Pointless and inaccurate

*2026-08-26, version 5.8.4*

Have been using this app along with oura ring for temp tracking. I have regular periods and after 6 months of use it still tells me every day is a ‘use protection’/‘red’ day, except during the days I’m actually on my period. And my periods are regular, which tells me their algorithm for prediction is just awful.

### 1/5 — Not for night shift workers

*2026-08-24, version 5.8.4*

The NC compatible wearables only use data taken from 7p-10am. NC states you only need 4 hours of sleep which isn’t accurate, after speaking to customer support you’ll find out you need 4 hours of sleep within 7p-10am. If you get home from work at 7am like I do your data wont be taken even if sleeping 8 hours straight. This information needs to be stated up front so shift workers don’t waste their money or time trying to get data to appear.

### 5/5 — They actually care

*2026-08-24, version 5.8.4*

I had a miscarriage while using the app to track the pregnancy (any my cycles previously). One of the hardest things was to log the end of the pregnancy with all of my apps like Oura ring, pregnancy tracker apps etc. Natural Cycles has sent countless messages validating the grieving process and hormonal changes, sending articles to read and mental health check ins. You can tell this app was designed by women. They’ve been more helpful and caring than my OB. I am grateful this app not only practices the medical side of women’s needs but also the emotional. Worth every penny.

### 3/5 — Partner view

*2026-08-23, version 5.8.4*

Update the partner view. Add more versatility to the app and more features. And give me a dark mode please.

### 1/5 — App is good but they are going woke.

*2026-08-22, version 5.8.4*

Pretty good app for us better than any hormone drug or device but me and my wife don't like how woke they are getting. Not as friendly if you want to have baby and they're starting to use the terms “people who menstruate” versus “women”. Which this app is entirely for women not mutilated men.

### 2/5 — What's the point?

*2026-08-22, version 5.8.4*

I got a free 28 day trial, so I decided to try it. However, I can't even add any data because I'm in "demo mode" so it shows me fake data. What's the point in the free trial if I can't even use it? Also I want to stay on my hormonal birth control, since it's more effective than the app, I just wanted to use the app to track my periods but I can't even add the days I have my periods. It's pretty frustrating and I don't even see the point in having it.

### 1/5 — Privacy issues

*2026-08-19, version 5.8.4*

Concerns around data privacy! It says it’s optional to have your data passed on to social media and third parties but then gives you no easy way to opt out?! Why would anyone want their private data sold to social media for marketing purposes. Also states as you download the app that it doesn’t sell your data then in the T&Cs it’s saying it does and you need to email to opt out….come on. You also have to purchase their device or another expensive device such as an Apple Watch to use the app and measure your temperature. I had this app years ago when you could simply input your temp every morning manually using a cheap thermometer, now there is no option for that and you HAVE to have a device. Disappointing.

### 5/5 — Happy Cycler!

*2026-08-19, version 5.8.4*

This app has given me much peace of mind with my intimate life. I gifted this to myself for my 23rd birthday and I couldn’t be happier with it! My partner and I love to have it :)

### 1/5 — Scam

*2026-08-19, version 5.8.4*

I downloaded this so I could track my temp throughout the day so I can track my fertility but you need to buy a subscription just to use the damn app, there’s other apps out there that could do the same thing but free! This app is a money hungry scam demanding money off of women wanting to know more about their bodies.
Edit cause I’m mad about this: So first of all you want to protect our data but put a price tag on it? You should want to protect it without us paying. Also when did I mention birth control, cause I didn’t, I wanted to be able to track my temperature with my Apple Watch throughout the day so I can track my cycle more accurately. I can understand having a subscription to obtain more information and have other stuff in the app like Flo and other period tracker apps do but having a free to download app but I have to pay in the app to even use it seems scummy. The developer that responded to me really didn’t respond to my review and seemed to just copy and paste a response in just to make me “happy” which pisses me off more. If you’re constantly getting negative reviews for the same thing, it really tells you something that the developers should fix. Respectfully do better.

### 1/5 — Sketchy Refund Policy

*2026-08-18, version 5.8.4*

I checked out this app through an Oura ring trial that I was provided. I tried this out and didn’t care for needing to track my cycle on three different applications. I much prefer using Stardust and Oura. I did not remember how long the trial was for, and forgot to cancel in time and was unexpectedly charged the $149.99 fee. With how expensive living is right now it comes at a huge inconvenience to me and my family as school is starting soon and those funds would’ve been useful for my child’s school supplies instead of an app I won’t be using. Contacted customer service and they are so anal about the fact that they sent a courtesy reminder and since I didn’t cancel at that point that I just have to eat the cost. Don’t even try them there are better apps out there.

## Frequently asked questions about Natural Cycles

### What does the Natural Cycles app do?

The app uses your body temperature to track ovulation, helping you identify fertile days for preventing or planning pregnancy. It offers a hormone-free contraception method and provides insights into different stages of your reproductive health, including postpartum and perimenopause.

### How effective is Natural Cycles for birth control?

The app is scientifically proven to be 93% effective with typical use and 98% effective with perfect use. It's important to note that no birth control method is 100% effective, and it does not protect against STIs.

### What are the subscription options and costs?

Natural Cycles requires a subscription to access its core features, with options for monthly and annual plans. Signing up for an annual subscription often includes a free NC° Band. US users may be covered by insurance for their subscription.

### What devices can I use to measure my temperature with Natural Cycles?

You can measure your temperature using the NC° Band, an Oura Ring, Apple Watch Series 8 or newer (worn while sleeping), or a compatible Garmin device. The app adapts to your unique cycle, even if it's irregular.

### Is my data safe with Natural Cycles?

Yes, advanced data protection is a priority. Unlike many free apps that sell user data for advertising, Natural Cycles' subscription fee helps protect your privacy and keep your data safe.

## Version history (last 5 releases)

### 5.8.4 — 2026-08-18

This update includes a few tweaks for an improved app experience.

### 5.8.3 — 2026-08-04

We've been busy working under the hood. Our latest update ensures our technical health stays strong so you can enjoy a seamless experience.

### 5.8.2 — 2026-07-22

We've been busy working under the hood. Our latest update ensures our technical health stays strong so you can enjoy a seamless experience.

### 5.8.1 — 2026-07-07

A few polishes for a better experience.

### 5.8.0 — 2026-06-29

Our latest update freshens up the app for you!

## Apps similar to Natural Cycles

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Premom-Ovulation Tracker, PCOS](https://appshunter.io/ios/app/premom-ovulation-tracker-pcos/id1279295922) | 4.8 (58,885) | Free | Health & Fitness |
| [Clue Period & Cycle Tracker](https://appshunter.io/ios/app/clue-period-and-cycle-tracker/id657189652) | 4.8 (401,903) | Free | Health & Fitness |
| [Flo Cycle & Period Tracker](https://appshunter.io/ios/app/flo-cycle-and-period-tracker/id1038369065) | 4.7 (1,947,731) | Free | Health & Fitness |
| [Femometer Fertility Tracker](https://appshunter.io/ios/app/femometer-fertility-tracker/id1269972832) | 4.9 (70,208) | Free | Health & Fitness |
| [Cycles: Period & Cycle Tracker](https://appshunter.io/ios/app/cycles-period-and-cycle-tracker/id577187307) | 4.7 (26,743) | Free | Health & Fitness |
| [Period Tracker Period Calendar](https://appshunter.io/ios/app/period-tracker-period-calendar/id896501514) | 4.9 (172,779) | Free | Health & Fitness |

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*