Natural Cycles (NC° Fertility Algorithm)

by Natural Cycles  · Based in Sweden → — The only FDA-cleared birth control app.
Family Medicine Internal Medicine Obstetrics & Gynecology
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Subscription-based

Overview

Natural Cycles (NC° Fertility Algorithm) is an FDA-cleared birth control app that utilizes an AI-powered fertility algorithm. It combines statistical modeling with machine learning to generate individualized fertility predictions. [4, 7] The app helps users prevent or plan pregnancies by identifying fertile and non-fertile days based on basal body temperature and period data. [1, 13, 19, 21] Natural Cycles is designed to adapt to each user’s unique cycle, even if it’s irregular, and provides a daily fertility status. [16, 19, 20]

Beyond birth control, Natural Cycles offers modes for planning pregnancy, following pregnancy, postpartum recovery, and navigating perimenopause, aiming to support women throughout their reproductive journey. [4, 18] The app integrates with various wearable devices like the Oura Ring, Apple Watch, and Garmin devices for effortless overnight temperature tracking. [15, 16, 19] Natural Cycles emphasizes its commitment to data privacy, adhering to GDPR standards and FDA cybersecurity requirements. [6, 18, 19, 22]

Reviewed by Pouyan Golshani, MD — Interventional Radiologist

Key Features

  • AI-powered fertility algorithm for individualized predictions
  • FDA-cleared birth control functionality
  • Modes for planning pregnancy, following pregnancy, postpartum, and perimenopause
  • Integration with wearable devices (Oura Ring, Apple Watch, Garmin, NCu00b0 Band)
  • Daily fertility status (Red for fertile, Green for non-fertile)
  • Personalized cycle insights and trends
  • Cycle history with customizable trackers
  • Alerts for cycle irregularities
  • Exportable Cycle Report for healthcare providers
  • Advanced data privacy protection (encryption, pseudonymization, 'Go Anonymous' option)

Use Cases

  • Hormone-free birth control
  • Planning and maximizing chances of conception
  • Tracking and understanding menstrual cycles
  • Monitoring pregnancy development
  • Supporting postpartum recovery
  • Navigating perimenopause symptoms and hormonal changes

Details

Category OB/GYN AI, Patient Engagement & Education
Pricing Subscription-based
  • Monthly: $14.99/month; Annual: $9.99/month (billed annually, includes free basal thermometer) [12, 25]
DeploymentCloud-based
Compliance
BAA AvailableUnknown AI-estimated
HIPAA CompliantUnknown AI-estimated
FDA Status Unknown AI-estimated

Natural Cycles is the first and only FDA-cleared birth control app, classified as a Class II medical device. [2, 11, 18] It has received six FDA clearances, including for its birth control app, integrations with Oura Ring and Apple Watch, over-the-counter availability, and its next-generation AI-powered NC° Fertility Algorithm. [4, 7, 10, 14]
Integrations
EHR Not specified
Specialties Family Medicine, Internal Medicine, Obstetrics & Gynecology

What the Web Says

Natural Cycles (NCu00b0 Fertility Algorithm) is a birth control and fertility tracking app that has garnered significant attention for being the first FDA-cleared app of its kind. It uses basal body temperature to identify fertile windows and has been reviewed by medical professionals, tech experts, and users across various platforms. The algorithm aims to provide a hormone-free birth control option or assist with conception.

Overall: Mixed

Strengths

  • FDA-cleared for contraception, providing a level of trust and validation.
  • Hormone-free birth control option, appealing to those who want to avoid hormonal side effects.
  • Empowers users with knowledge about their menstrual cycle and fertility.
  • Can be used for both preventing pregnancy and planning for pregnancy.
  • User-friendly interface and integration with smart thermometers.
  • Data privacy and security are generally well-regarded.

Limitations

  • Requires consistent daily temperature measurement, which can be a burden for some users.
  • Effectiveness can be reduced by inconsistent use, illness, or lifestyle factors.
  • Higher upfront cost compared to some other fertility tracking methods or apps.
  • Some users report a higher number of 'red days' (requiring abstinence or barrier methods) than expected.
  • Not suitable for everyone, especially those with irregular cycles or certain medical conditions.
  • Learning curve for understanding the algorithm's nuances and interpreting results.

Based on reviews from: FDA, Natural Cycles Official Website, Reddit (r/NaturalCycles, r/birthcontrol), G2, Capterra, Healthcare IT News, TechCrunch, The Verge, Medical News Today, OB/GYN reviews and articles

Last updated: 2026-08-05

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Videos

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Frequently Asked Questions

The Natural Cycles (NCu00b0) Fertility Algorithm uses basal body temperature (BBT) data, along with an optional LH test result, to identify a woman's fertile window. It analyzes shifts in BBT to detect ovulation and then uses a proprietary algorithm to determine green (non-fertile) and red (fertile) days.
Typical user compliance rates for Natural Cycles vary, but consistent daily temperature measurement and accurate data entry are crucial for its effectiveness. Factors influencing compliance include user motivation, lifestyle, and understanding of the app's instructions.
Primary alternatives to Natural Cycles include other fertility awareness methods (FAMs) like the symptothermal method, cervical mucus method, and calendar method, as well as other fertility tracking apps. These alternatives can differ in their reliance on technology, data input requirements, and reported efficacy rates.
The Natural Cycles algorithm may have limitations in patient populations with irregular cycles, PCOS, or other gynecological conditions that can disrupt typical ovulatory patterns. These conditions can make it more challenging for the algorithm to accurately predict ovulation and identify the fertile window.
The pricing structure for Natural Cycles typically involves a subscription fee, which can be paid monthly or annually. This cost can impact patient access, particularly for those with limited financial resources, and may influence long-term adherence to the method as a form of contraception or conception planning.
Natural Cycles addresses data privacy and security by adhering to regulations like GDPR and implementing measures to protect sensitive patient health information. They typically outline their data handling practices in their privacy policy, detailing how data is collected, stored, and used.
Clinical evidence supporting Natural Cycles' efficacy as a contraceptive method or for conception planning is based on studies that report its Pearl Index. The Pearl Index indicates the number of pregnancies per 100 woman-years of use, with typical use and perfect use rates often differing.

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Suggest an Edit → | Last Verified: 2026-08-05 | First Added: 2026-08-05

Investors who backed Natural Cycles (NC° Fertility Algorithm)

Funded through the company that built this tool.

Point72 Ventures
VC T3
Stamford, United States
$5M-$25M
Point72 Ventures is the venture investment arm of Point72 Asset Management, the multi-strategy hedge fund founded by Steve Cohen, with substantial assets…
AI/ML in Healthcare Care Delivery / Tech-Enabled Services
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