Prevent pregnancy naturally with personalized cycle insights
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free plan available, paid tiers above
Biggest pro
Hormone-free and side-effect-free birth control option.
Biggest con
Requires consistent daily temperature measurement.
TL;DR - Natural Cycles
- FDA-cleared, hormone-free birth control app.
- Uses daily temperature to identify fertile and non-fertile days.
- Provides personalized cycle insights and supports conception planning.
Pricing: Free plan available
Best for: Growing teams
What is Natural Cycles?
Natural Cycles is a certified birth control app that uses basal body temperature and an advanced algorithm to identify a woman's fertile window. It helps users prevent pregnancy naturally, without hormones or side effects, by indicating 'Red Days' (when protection is needed) and 'Green Days' (when protection is not needed). The app is designed for women seeking a non-hormonal birth control method, those who want to understand their cycle better, or individuals planning a pregnancy. It provides personalized cycle insights, tracks ovulation, and offers a comprehensive overview of reproductive health.
Users measure their basal body temperature daily using a compatible thermometer and input the data into the app. The algorithm then analyzes this data, along with other optional inputs like period tracking and LH test results, to determine fertility status. This method offers a precise way to understand individual cycle patterns, empowering users with knowledge about their bodies and reproductive health.
Pros & Cons
Pros
- Hormone-free and side-effect-free birth control option.
- Provides a deep understanding of one's menstrual cycle.
- Can be used for both preventing and planning pregnancy.
- FDA-cleared and clinically proven effectiveness.
Cons
- Requires consistent daily temperature measurement.
- Effectiveness depends on diligent and correct use.
- Does not protect against sexually transmitted infections (STIs).
Preview
Key Features
Daily fertility status (Green for non-fertile, Red for fertile)Basal body temperature trackingLH test integration for enhanced accuracyPersonalized cycle insights and predictionsSymptom tracking (mood, pain, discharge, sex drive)Period prediction and trackingConception planning modeEducational content on reproductive health
Pricing Plans
Free TrialPricing checked Jun 13, 2026
Free
Free
- 1 user
- 1 project
- 1 GB storage
- Basic features
Basic
$10 / month
- 5 users
- 5 projects
- 10 GB storage
- Advanced features
Pro
$25 / month
- Unlimited users
- Unlimited projects
- 100 GB storage
- All features
- Priority support
Reviews
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Natural Cycles FAQ
How does Natural Cycles determine fertile and non-fertile days?
Natural Cycles determines fertile and non-fertile days by analyzing daily basal body temperature readings, which rise after ovulation. Its algorithm learns individual cycle patterns and identifies the fertile window when sperm can survive and an egg can be fertilized.
Is Natural Cycles only for birth control, or can it be used for other purposes?
Natural Cycles can be used for both birth control and conception planning. Users can switch between 'Prevent' and 'Plan' modes depending on their family planning goals. It also provides comprehensive cycle tracking and insights into general reproductive health.
What kind of thermometer is needed to use Natural Cycles?
Natural Cycles requires a highly accurate basal body thermometer that measures to two decimal places. While any such thermometer can be used, the product offers its own branded thermometer for optimal integration and ease of use.
How effective is Natural Cycles as a birth control method?
Natural Cycles is clinically proven to be highly effective when used correctly. Its effectiveness is comparable to other common birth control methods, with typical use effectiveness reflecting real-world scenarios where adherence may vary.
Can I use Natural Cycles if I have irregular periods?
Natural Cycles can be used by individuals with irregular periods. The algorithm is designed to adapt to individual cycle variations, though it may result in more 'Red' (fertile) days for those with highly irregular cycles, requiring more consistent use of protection during those times.
Does Natural Cycles integrate with other health tracking devices or apps?
Natural Cycles integrates with certain wearable devices that can measure basal body temperature, such as specific smart rings, to automate temperature input. It also offers optional integration with LH (luteinizing hormone) test results to further refine fertility predictions.
What happens if I forget to take my temperature one day?
If a user forgets to take their temperature, Natural Cycles will typically assign a 'Red' (fertile) day as a precautionary measure to ensure maximum protection. Consistent daily temperature input is crucial for the algorithm's accuracy.
Is Natural Cycles suitable for individuals who are breastfeeding or approaching menopause?
Natural Cycles is not recommended for use as birth control during breastfeeding or perimenopause, as hormonal fluctuations during these times can significantly impact cycle predictability and the accuracy of temperature-based fertility tracking.
Source: naturalcycles.com