Track Your Cycle Naturally with Natural Cycles SE
FDA-cleared birth control app — hormone-free, personalized, and backed by science.
Learn More at Natural CyclesOpens the official Natural Cycles SE site.
Natural Cycles SE is the first FDA-cleared birth control app that uses your daily temperature readings to track your menstrual cycle. It adapts to your unique cycle patterns, telling you when you’re fertile and when you’re not — no hormones, no guesswork.
- Brand:
- Natural Cycles SE
- Official site:
- naturalcycles.com
- Category:
- Healthcare Services
What you get with Natural Cycles SE
Hormone-Free Birth Control
No pills, patches, or implants — just a simple daily temperature check.
FDA Cleared & Clinically Tested
The only birth control app with FDA clearance, proven effective in clinical studies.
Personalized to Your Cycle
Uses an algorithm that learns your unique cycle patterns for accurate predictions.
Easy Daily Routine
Just take your temperature each morning with the included basal thermometer and log it in the app.
Real-Time Fertility Status
Get a clear daily result: green for low fertility, red for high fertility — no ambiguity.
See it for yourself
The full Natural Cycles SE range, prices, and current offers live on the official site.
Learn More at Natural CyclesHow it works
Measure your basal body temperature every morning using the provided thermometer.
Log the reading in the Natural Cycles app, which analyzes your cycle pattern.
The app calculates your daily fertility status and displays a green or red light.
On green days, you can have unprotected sex with minimal risk; on red days, use protection or abstain.
Frequently asked questions
Is Natural Cycles effective as birth control?
Yes, when used correctly, Natural Cycles has a Pearl Index of 6.9 (typical use) and 1.0 (perfect use), comparable to many hormonal methods.
Do I need a prescription to buy Natural Cycles?
No, Natural Cycles SE is available over the counter without a prescription.
How long does it take for the app to learn my cycle?
The app becomes more accurate over time, but it starts providing fertility status from the first day of use.
Can I use Natural Cycles if I have irregular periods?
Yes, the app is designed to work with irregular cycles, though it may take longer to learn your pattern.
What is included with the Natural Cycles SE subscription?
The subscription includes the app and a high-precision basal thermometer.
Track Your Cycle Naturally with Natural Cycles SE
Learn More at Natural CyclesDisclosure: this page contains affiliate links — if you buy through them, SwiftHerb may earn a commission at no extra cost to you. See our affiliate disclosure. Content here is general information about the brand and is not medical advice; always read product labels and consult a professional where appropriate.