How trackle works
- Uses the symptothermal method
- Automatically measures while you sleep
- Accurately determines fertile and infertile days
- Approved for contraception
- Also ideal for those with irregular sleep patterns
How to use trackle
Track your fertility status every day in 3 easy steps
Step 1: In the evening – insert trackle
Insert your trackle like a tampon before going to sleep. While you sleep, the sensor accurately measures your core body temperature.
Step 2: In the morning – put trackle in its box
After getting up, remove trackle, clean it, and place it back in its box. Your temperature data will be automatically and securely transmitted to the trackle server.
Step 3: Track cervical mucus & check fertility
Enter your cervical mucus quality in the app. Our algorithm combines all the data and immediately shows you your fertility status for today.
trackle is there for you at every stage of life
Contraception
Practice safe and natural birth control. trackle automatically measures your basal body temperature overnight and determines your fertile days using the symptothermal method – all without hormones.
Getting Pregnant
Use biology instead of chance: trackle accurately determines your fertile window and ovulation. That way, you’ll know exactly when your chances of conceiving are highest.
Understanding the Body
Make your cycle visible. trackle helps you better understand hormonal processes and signals – such as PMS – so you can live in harmony with your own rhythm.
How does trackle analyze the data?
trackle calculates your fertility status according to the rules of the symptothermal method and shows you, on a daily basis, whether today is a fertile day or not. The symptothermal method (STM) is the most reliable NFP method, in which, in addition to basal body temperature, another body sign (cervical mucus) is observed. When used perfectly, the STM has a Pearl Index of 0.4. The method involves no side effects, artificial hormones, or copper.
Since 2024, the symptothermal method has been officially recommended as a safe, natural method of contraception in the new guidelines of the German Society for Gynecology and Obstetrics (DGGG).
Everything you need to know in one app
Designed to support you in meeting your individual needs
trackle is a good fit for you in these cases as well*.
Ideal for shift work
The sensor simply measures your temperature while you sleep – no matter what time of day it is. Fixed measurement times are now a thing of the past.
Support for Endometriosis & PCOS
trackle helps you better understand your cycle patterns if you have PCOS or endometriosis. By analyzing your data daily, you can identify ovulation and predict your period and related symptoms more accurately.
Flexible for irregular cycles
trackle checks your fertility status individually every day. This makes the method completely safe and reliable, even with irregular cycles.
* Medical conditions and life situations are always unique to each individual – please consult your doctor about this. Important: trackle is based on the analysis of ovulation and is therefore only suitable for people who ovulate.
Forget about measuring your temperature in the morning.
Let trackle handle the analysis and enjoy the security.
Forget about measuring your temperature in the morning.
Let trackle handle the analysis and enjoy the security.
FAQ
Can I wear trackle even during my period?
It’s up to you whether you wear the sensor during your period. We recommend starting to track on the fifth day of your cycle – as a guide, your cycle always begins on the first day of your period. Please continue tracking every night until trackle has reliably determined your ovulation. After that, you can decide whether or not to continue tracking until your next period.
When can I start using trackle after I stop taking the pill?
You can generally start using trackle right after you stop taking the pill, but you should be prepared for the fact that your period and your first ovulation might take a little while to return – your body often needs some time to regain its balance after stopping hormonal birth control. We therefore recommend that you start wearing the sensor on the fifth day of your period and track your cervical mucus daily.
If you need help or information about stopping the pill, you’ll find valuable tips in our Guide: How to stop the pill.
At what point does the analysis become reliable?
What makes trackle special: The results are reliable starting with your very first cycle, since the system isn’t based on past data or predictions. Instead, trackle analyzes your current physical symptoms every day—specifically, your basal body temperature and your observations of cervical mucus.
Since trackle uses the symptothermal method for analysis, you’ll know every day whether you’ve already ovulated in this cycle or not. This means trackle doesn’t require any adjustment period. However, if there isn’t enough data yet, the system will continue to assume you’re fertile.
When and how does trackle determine ovulation?
trackle is based on the symptothermal method (STM). For a reliable analysis, the system combines two bodily symptoms:
- Core body temperature: The sensor measures this automatically at night.
- Cervical mucus: You enter your observations manually into the app.
The golden rule: An infertile phase is only confirmed once both the temperature rise and the mucus peak have been verified. If a value is missing, the day is considered fertile as a precaution.
Tip: Want to learn more about the method and the reliability of trackle? Then check out our free webinar!
How secure is trackle?
trackle evaluates data strictly according to the rules of the symptothermal method (STM). With a Pearl Index of 0.4, the method’s effectiveness is comparable to that of the birth control pill (both are below 1). Its reliability is also medically recognized: The German Society for Gynecology and Obstetrics (DGGG) explicitly recommends the STM in its official guidelines as a safe, natural method of contraception. These guidelines serve as a sound basis for doctors to provide professional advice.
You can find detailed information comparing different methods here:
Pearl Index and Contraceptive Safety
Does the trackle analysis also take into account the survival of sperm over several days?
There are only about seven days per cycle during which pregnancy can occur. This period consists of the egg’s lifespan (approx. 12–18 hours) and the sperm’s survival time (up to five days).
trackle precisely identifies these fertile and infertile phases according to the rules of the symptothermal method. What makes it special is the double check: By combining the analysis of basal body temperature and cervical mucus, the system offers maximum accuracy.
Scientifically proven: With a Pearl Index of 0.4, the method is comparable to the birth control pill in terms of reliability.
Tip: Want to understand the details? Learn more about analysis and safety in our free webinar!
Is trackle suitable for shift work or restless nights?
Absolutely – the only important thing is that you wear the sensor during a sleep or rest period of at least four hours. The exact time of day doesn’t matter for the measurement. If, in rare cases, a change in your daily routine does affect your readings, you can simply mark this as an interfering factor in the app. The corresponding reading will then be automatically ignored and won’t be included in the overall analysis.
If you have any questions about how to use the device or your results, our support team is always happy to assist you with a personalized analysis of your data.
Can I exchange my trackle? Is there a money-back guarantee?
Since trackle is a certified medical device, we can only accept returns of the sensor in its original, unopened condition within the 14-day cancellation period. Once unpacked, returns are not accepted.
However, we guarantee a 30-month service life from the date of purchase – if your sensor develops a defect during this time, we’ll replace it free of charge.
Want to try trackle first?
Then our subscription is the perfect choice for you: Instead of buying the sensor at full price, you can use it for a small monthly fee covering the app and hardware – with absolutely no hidden costs!
Here’s what makes it special: You can sign up for a subscription that includes a built-in trial period. With the Flex Subscription (which already includes the one-time fee for the trial period), you secure the right to cancel after just six months. If you don’t cancel at least 14 days before the end of those six months, your subscription will automatically transition to the regular 24-month term – it’s that simple.