Jump to

Farrinstitute is reader-supported. We may receive commissions on purchases made through links on our site.

In-Depth Natural Cycles Review on The App and Its Impact as Modern Birth Control

In-Depth Natural Cycles Review on The App and Its Impact as Modern Birth Control

By Kire Stojkovski M.D
Editor Jonathan Hoarau Published 21 June 2023
Time to read 10 min

In the age of technology, the healthcare industry is continuously evolving to offer innovative and personalized solutions for users. One such breakthrough comes from Natural Cycles, a fertility-tracking app that doubles as a birth control method. 

This comprehensive Natural Cycles review aims to provide an in-depth analysis of the app’s effectiveness, comparisons to traditional birth control methods, and impact on modern health practices. Before deciding if Natural Cycles suits you, it’s essential to understand how it works, its pros and cons, and all the factors you should consider.

Introduction to Natural Cycles Birth Control Review

Natural Cycles is the first FDA-cleared birth control app designed to help women track their menstrual cycles and identify fertile days. Developed by a team of experts, it uses advanced algorithms that analyze individual data, such as body temperature, to predict ovulation. 

Natural Cycles is the first CE-marked Class IIb medical device for use as a method of birth control.

By understanding their fertility patterns, women can avoid intercourse or use additional protection during fertile days to prevent pregnancy. The app also offers options for those actively trying to conceive, providing insights on the best days to maximize their chances.

Natural Cycles has garnered attention globally, with thousands of users praising its effectiveness and ease of use. However, some critics argue that it may not suit everyone and could lead to unplanned pregnancies. 

Conducting thorough research and considering personal circumstances before deciding if Natural Cycles are the right choice for you is essential.

Take control of your fertility today! Download Natural Cycles now and join over 1 million women who trust our algorithm

What Is Natural Cycles and How Does It Work?

Natural Cycles is a health app that serves as a digital contraceptive and fertility tracking tool. It utilizes an algorithm to predict a woman’s fertile window based on her menstrual cycle data and daily body temperature readings. 

The app then informs users of their fertility status, providing “green days” (non-fertile) and “red days” (fertile) to help them plan their sexual activities accordingly.

To use the app, women must measure their basal body temperature (BBT) first thing in the morning before getting out of bed. BBT is the body’s lowest resting temperature, and slight changes in this reading can indicate hormonal fluctuations corresponding to ovulation. [1]

Users receive personalized fertility predictions by inputting their BBT and other menstrual cycle data into the app.

Research findings indicate that measuring basal temperature, the temperature recorded after resting assists in identifying ovulation. Naturally, certain aspects can influence this measurement method. Therefore, taking regular temperature readings consistently each morning can enhance precision. [1]

As stated on the brand’s official website, the Natural Cycles app has a 93 percent effectiveness rate with standard usage, which rises to 98 percent when used flawlessly.

Get non-hormonal birth control that’s side-effect-free with Natural Cycles 

Natural Cycles App Review – The Science Behind It

The algorithm employed by Natural Cycles is based on the well-established Fertility Awareness-Based Methods (FABMs), which involve monitoring various physiological signs to determine a woman’s fertile window.  [2]

The primary physiological signal used by the app is BBT, which typically rises by about 0.3 to 0.5 degrees Celsius after ovulation due to increased progesterone production. [3]

The Natural Cycles algorithm also considers that sperm can survive for up to five days in the female reproductive tract. Thus, it considers the days leading up to ovulation as fertile. Additionally, the algorithm adapts to each user’s unique cycle, becoming more accurate as more data is collected.

How to Use the App?

To begin, you need to download (and buy) the application and choose one of the following plans:

  • NC Contraception (avoiding pregnancy);
  • NC Plan Pregnancy (identifying fertile days);
  • NC Track Pregnancy (observing pregnancy);

Before taking basal thermometer measurements, input your menstrual cycle data into the app. After obtaining your basal thermometer, you can initiate temperature measurements. The company provides a basal thermometer to those with annual subscriptions, while those on a monthly plan can purchase one at a pharmacy.

You should take temperature readings immediately in the morning before getting out of bed or using the restroom. To guarantee accurate results, ensure you have at least three hours of undisturbed sleep each night. Input your temperature into the app. If you believe your temperature has risen due to illness, you may refrain from entering it on that particular day.

The company’s website states that daily temperature measurements are not required, but consistent readings on most mornings allow the algorithm to understand your cycle better.

At this point, Natural Cycles begins analyzing your data, such as temperature measurements and menstrual cycle details. This enables the app to determine the days with the highest fertility probability, clearly indicating red (fertile) or green (not fertile).

Your display will show either a green message stating “Not Fertile” or a red message indicating “Use Protection,” signifying a greater likelihood of pregnancy on that day.

Additionally, the app can monitor other aspects, such as premenstrual syndrome (PMS), discomfort, mood fluctuations, and sexual desire.

Take control of your birth control! Order the only FDA Cleared app today and skip the pharmacy hassle. Download here!

Natural Cycles Birth Control Review: Pros and Cons

Pros – Natural Cycles Review

  • Hormone-free and non-invasive: Natural Cycles offers an alternative to hormonal birth control methods, which can cause various side effects for some women. The app also avoids invasive procedures like intrauterine devices (IUDs) or implants.
  • Dual purpose: The app can be used for both contraception and fertility tracking, making it a versatile tool for women at different stages of their reproductive journey.
  • Personalized predictions: The algorithm adapts to each user’s unique cycle, providing personalized fertility predictions based on individual data.

Cons – Natural Cycles Review

  • Requires consistency and commitment: Users must measure their BBT daily and input their data consistently for the app’s effectiveness.
  • Not suitable for everyone: According to our Natural Cycles Review, women with irregular cycles or certain medical conditions may find the app less accurate and reliable.
  • Subscription-based: The Natural Cycles app review reveals that a paid subscription is required to access its full features, which may only be affordable for some users.

Take control of your fertility journey today – Check out Natural Cycles now!

Natural Cycles App Review: Features and Usability

The Natural Cycles app offers a user-friendly interface allowing users to input their daily temperature readings and menstruation data easily. The app then calculates the user’s fertility status and displays it in a color-coded calendar, making it simple to interpret and understand.

Aside from its primary function, the app offers several additional features, including a temperature graph display, cycle statistics, and reminders for users to input their data. Users can also export their data and share it with healthcare professionals.

The app is currently available for iOS and Android devices and requires a subscription to access its full features. A thermometer designed explicitly for measuring BBT is included in the subscription, ensuring accurate readings.

Natural Cycles Birth Control Reviews: Effectiveness and User Experiences


According to our Natural Cycles Review, research from 2019 examined the app’s effectiveness, including 12.247 women from the UK. The study found that the app had a typical use effectiveness rate of 95%, meaning that five of every 100 women who used the app for a year would become pregnant. [4]

In accordance to our Natural Cycles Birth Control Review, the effectiveness rate is comparable to other traditional contraceptive methods, such as the pill (91% effective) and condoms (82% effective). 

Natural Cycles Review – User experiences

Various Natural Cycles birth control reviews positive report experiences from users who appreciate the hormone-free, non-invasive alternative birth control method. Many women have successfully used the app for both contraception and fertility tracking. 

At the time of our Natural Cycles Review, their website has a rating of 4.7 out of 5 from more than 57.000 global users.

Natural Cycles is available for both Android and ios users. At the time of our Natural Cycles App Review on the AppStore, it has a rating of 4.8 stars out of 5 out of 15.300 users. On their Android app on Google Play, they have a rating of 4.7 stars out of 5, with ratings from more than 19.000 reviews.

However, according to our Natural Cycles Review, some users have reported that the app can be overly cautious, resulting in more “red days” than expected.

Critics of the app argue that it might not suit women with irregular cycles or those who cannot commit to consistently taking their temperature. Some also express concerns about the potential for user errors, which could compromise the app’s effectiveness.

Take control of your birth control! Order the only FDA Cleared app today and skip the pharmacy hassle. Today!

Natural Cycles App Review – Pricing

At the moment of our Natural Cycles Review, they offer two subscription options: a monthly subscription priced at $12.99 per month or an annual subscription costing $99.99 per year. The yearly subscription includes a free basal thermometer, while monthly subscribers need to purchase one separately. 

It is important to note that subscriptions are non-refundable, and users should weigh the pros and cons before committing. But, to understand Natural Cycles without cost, you can try the complimentary demo mode by downloading the application.

Experience the Natural Cycles app today!

Comparing Natural Cycles to Traditional Birth Control Methods

When considering Natural Cycles as a birth control option, it’s essential to compare it to other traditional methods. As mentioned earlier, the app’s typical use effectiveness rate (93%) is comparable to the pill (91%) and condoms (82%). However, it falls short of the effectiveness of long-acting reversible contraceptives (LARCs), such as IUDs (99% effective) and implants (99% effective). [5]

One significant advantage of Natural Cycles over hormonal methods is the lack of side effects, as many women experience adverse reactions to hormonal contraceptives. Additionally, the app offers a non-invasive alternative to LARCs, requiring a medical insertion and removal procedure.

However, the app does require a higher level of user commitment and consistency compared to other methods. Women who struggle with daily temperature readings and data input may find other contraceptive options more suitable.

Natural Cycles vs. Alternatives

While Natural Cycles is the first FDA-cleared fertility tracking app, several alternatives exist in the market, such as Clue, Flo, and Glow. These apps also use algorithms to predict natural cycle users fertile days based on their data. However, they often lack FDA clearance and rigorous clinical studies that support Natural Cycles’ effectiveness as a birth control method.

Traditional fertility awareness methods, such as the symptothermal method, involve tracking multiple fertility signs, including BBT, cervical mucus, and cervical position. These methods can be effective when practiced correctly but may be more time-consuming and challenging to interpret than a fertility tracking app.

Download the only FDA Cleared app today and skip the pharmacy hassle. Click now!

Natural Cycles Review – FAQ

Does Natural Cycles work?

According to clinical studies and our Natural Cycles Review, it has a 93% effectiveness rate with typical use and a 98% effectiveness rate with perfect use. However, this may vary based on individual factors and adherence to the app’s guidelines.

Is Natural Cycles Legit?

In 2015, a research study analyzed the efficiency of the Natural Cycles application in 317 individuals. The findings revealed that a mere 0.05% of infertile days were incorrectly predicted, suggesting that the Natural Cycles app is a successful natural contraceptive technique. The Food and Drug Administration (FDA) has approved this application. [6]

Can I Use Natural Cycles if I Have Irregular Periods?

There may be better options than Natural Cycles for those with irregular cycles, as the app relies on consistent patterns of natural cycle to predict fertility. It is recommended to consult a healthcare professional before using Natural Cycles as a contraceptive method.

Can I Use Natural Cycles While Breastfeeding?

Natural Cycles offers a postpartum mode designed for breastfeeding users. However, it is essential to consult a healthcare professional before using the app during this period.

Conclusion for our Natural Cycles Review: Is It Legit?

In conclusion, this Natural Cycles review demonstrates that the app offers a promising alternative to traditional birth control methods for some women. Its hormone-free, non-invasive approach to contraception and fertility tracking makes it an attractive option for those seeking personalized, data-driven solutions to manage their reproductive health.

However, it’s crucial to consider the factors mentioned in this Natural Cycles review and consult with a healthcare professional before deciding if Natural Cycles is the right choice for you. As modern health practices evolve, it’s essential to stay informed about new developments and make informed decisions that best suit your needs and preferences.

Check Natural Cycles and join over 1 million women who trust our algorithm


Related articles

  • Hers Review
  • Nurx Review



1. [1] – Steward K, Raja A. Physiology, Ovulation And Basal Body Temperature. [Updated 2022 Jul 18]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK546686/

2. [2] – Thijssen A, Meier A, Panis K, Ombelet W. ‘Fertility Awareness-Based Methods’ and subfertility: a systematic review. Facts Views Vis Obgyn. 2014;6(3):113-23. PMID: 25374654; PMCID: PMC4216977.

3. [3] – Baker FC, Siboza F, Fuller A. Temperature regulation in women: Effects of the menstrual cycle. Temperature (Austin). 2020 Mar 22;7(3):226-262. doi: 10.1080/23328940.2020.1735927. PMID: 33123618; PMCID: PMC7575238.

4. [4] – Pearson JT, Chelstowska M, Rowland SP, Mcilwaine E, Benhar E, Berglund Scherwitzl E, Walker S, Gemzell Danielsson K, Scherwitzl R. Natural Cycles app: contraceptive outcomes and demographic analysis of UK users. Eur J Contracept Reprod Health Care. 2021 Apr;26(2):105-110. doi: 10.1080/13625187.2020.1867844. Epub 2021 Feb 4. PMID: 33539252.

5. [5] – Stoddard A, McNicholas C, Peipert JF. Efficacy and safety of long-acting reversible contraception. Drugs. 2011 May 28;71(8):969-80. doi: 10.2165/11591290-000000000-00000. PMID: 21668037; PMCID: PMC3662967.

6. [6] – Elina Berglund Scherwitzl, Angelica Lindén Hirschberg & Raoul Scherwitzl (2015) Identification and prediction of the fertile window using NaturalCycles, The European Journal of Contraception & Reproductive Health Care, 20:5, 403-408, DOI: 10.3109/13625187.2014.988210