Daysy Fertility Tracker – Natural Hormone-Free Ovulation Monitor & Fertility Awareness Device – Smart BBT Thermometer with App for Cycle Tracking, Conception, or Pregnancy Planning

Price: $319.00 - $279.00
(as of Feb 01, 2026 05:25:16 UTC – Details)

Product description

Effortless, hormone-free & accurate

Improve your quality of life with Daysy.

Daysy is your trusted companion for natural family planning.

In just 60 seconds, it measures your basal body temperature and, using a smart algorithm combined with your personal cycle data, clearly shows whether you’re fertile or not, with 99.4% accuracy.

No manual calculations or extra apps needed, Daysy offers an innovative take on ovulation tracking.

Invest in a long-term solution that guides you safely and confidently through your cycle.

Daysy is a certified medical device.

It is your personal cycle computer and combines a sensitive sensor with a smart algorithm.

With Daysy you understand your cycle.

Precisely know your fertile days and confidently tell when pregnancy is possible and when it’s not.

Simple measurement and automatic analysis.

With quick daily measurements, your fertility status is displayed directly on the device.

Daysy has its own dedicated app.

Get accurate predictions of your cycle calendar and analyze your temperature curve with ease.

1 What is Daysy?

2 What does Daysy do?

3 How do I use Daysy?

4 DaysyDay App

Take your fertility into your own hands. Precision & Reliability

Backed by 40 years of research, Daysy distinguishes your fertile and non-fertile days with 99.4% accuracy.

Effortless use

In just 60 seconds, you’ll know your fertility status. No manual calculations or extra apps needed. Daysy gives you clear, reliable results.

Intelligent algorithm

Using your individual measurement data, the algorithm performs advanced analyses to reliably identify your fertile days.

Long-term investment

Daysy is an investment in your health. A reliable solution for fertility planning with no extra costs or subscriptions.

Basal temperature

Every morning after waking up, measure your temperature under your tongue for 60 seconds with Daysy.

Menstruating?

If you’re on your period, simply confirm it with a quick click on the device.

Are you fertile?

Daysy uses a color-coded system to show your fertile and non-fertile days directly on the device.

DaysyDay app

You can sync your basal temperature and period data to the app. No subscription needed.

Stay informed

Use the app to follow your temperature curve and see predictions for future cycles.

Track your cycle with confidence: here’s how

1 Measure temperature 2 Enter your period 3 Fertility status 4 App synchronisation 5 Cycle forecasts

Is Daysy reliable and safe?

Yes, Daysy is a medical device with an accuracy of 99,4%

How soon can I trust Daysy’s results?

You can trust Daysy’s results starting directly from day one.

Who can use Daysy?

Daysy is for anyone who menstruates, whether you work shifts, are a mom, want to conceive, wish to prevent pregnancy, or are dealing with cycle-related issues like PCOS or endometriosis.

How long does the temperature measurement take?

The measurement takes just about 60 seconds a day. Simply take your basal temperature each morning after waking up to monitor your cycle.

Do I always have to measure my basal temperature at the same time?

No. What’s important is that you’ve rested for at least one hour and take your temperature immediately after waking, before getting up or moving around.

Take Control of Your Fertility with Daysy — A hormone-free, precision fertility tracker. Easily predict your fertile and non-fertile days with the help of its free app, empowering you to make informed decisions about your health and family planning.
Know Your Fertility Status in an Instant — Daysy uses a simple red (fertile) or green (not fertile) light to clearly show when you’re most likely to conceive, making it easier than ever to track your cycle.
Crafted in Germany & Designed in Switzerland — Daysy brings over 40 years of research and innovation to your fingertips. Trust a family-run company dedicated to giving you accurate, cutting-edge fertility insights.
Accurate Results You Can Count On — With a stunning 99.4% accuracy, Daysy reliably identifies your fertile and non-fertile days, making it your go-to tool for smart family planning and cycle tracking. Say goodbye to guesswork and hello to certainty.
Forget About Subscriptions! — Daysy’s free app is all you need for tracking your cycle. By combining basal body temperature with advanced algorithms, it provides personalized fertility insights, going far beyond simple period tracking.