Daysy Fertility Tracker – Natural Hormone-Free Ovulation Monitor & Fertility Awareness Device – Smart BBT Thermometer with App for Cycle Tracking, Conception, or Pregnancy Planning
$259.00
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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.
13 reviews for Daysy Fertility Tracker – Natural Hormone-Free Ovulation Monitor & Fertility Awareness Device – Smart BBT Thermometer with App for Cycle Tracking, Conception, or Pregnancy Planning
Add a review
$259.00
guerloudy –
DAYSY WORKS!
I honestly DONT know how anyone can have an issue with this device. Those who do either didn’t read the Manual so the learning curve must seem steep or miss temperature days which is the whole point of how this device predicts. I’ve only had this device for two months and already it is MIND BLOWING on how accurate it is. I do manual FAM charting to cross reference and to be safe but each time it matches DAYSY’s predictions.Please go on the DAYSY website BEFORE buying to determine if you are compatible with this device. It helps more to have a consistent cycle. READ THE MANUAL!!! It helps to understand the button faster, its colors, and rules on exceptions. Watch YouTube videos on DAYSY reviews and instructions to understand the device.I will say that the app was annoying on the day I set up the DAYSY(syncing issues). So If you are not a very patient person or if you try to do it on the go, I can see how you can assume that it’s not working. But since set up( which took an hour or so) it has run smoothly. I have forgotten to put in my period and gone back the day after to do so. I’ve also put my period on the wrong day accidentally and corrected it very easily. Correct things as soon as possible. It’s not a magical stick. You need to give a bit of attention and consistency to get the most out of it.
Abel –
Fácil de usar
Tienen la mejor atención al cliente. Me encanta este termómetro y su app es muy fácil de usar.
alayjah robbins –
2 cycles tracking with daysy & I’m currently 15w pregnant. It works!!
Love is an understatement! After a year of trying with my hubs and an early stage miscarriage, we got daysy. I had it 2 full cycles before successfully getting pregnant!!Previously used a tracker app and it just wasn’t tailored enough to me to be effective.Daysy truly changed the game for us!15 weeks and counting ❤️
Amazon86 –
Inversión que merece la pena
Me costó mucho decidir en comprarme Daysy por su elevado coste.Había leído quejas por la tardanza del dispositivo en darte más días verdes (que son los días seguidos para mantener relaciones sin embarazo). En mi caso que soy irregular y solo llevo un ciclo, ya me ha detectado para este mes 11 días verdes.En Europa es considerado como un dispositivo médico. Tiene una fiabilidad del 99.4%, una pasada, teniendo en cuenta que no hay hormonas que dañen tu cuerpo.A día de hoy, estoy completamente segura de que hice bien en invertir ese dinero. La tranquilidad que te da, el tener tu cuerpo libre de hormonas si no quieres un embarazo, o al contrario, saber cuándo es el momento en que estás ovulando para buscar un embarazo. Incluso es capaz de detectar un embarazo por la temperatura.Claro que tarda aprender el patrón de temperaturas de tu ciclo, ya que cada mujer es distinta. Vivimos en una sociedad en la queremos todo para ayer, y hay cosas que merecen la pena tirar de paciencia, el porcentaje de fiabilidad es altísimo, hay que tener en cuenta que los años fértiles de una mujer, es un tiempo prolongado en nuestra vida, y merece la pena unos meses de testeo, a cambio de la fiabilidad que ofrece, tanto si buscas embarazo, como si no.Cada mes que pase te va a ir poniendo más días verdes.Yo solo puedo recomendarlo, lo único que me apena, es no haberlo descubierto hace años…
Alexander D. –
Approved
Really accurate, takes some time for it to adjust to your personal needs but really food
Carlos Angulo –
Works great, the app makes it more useful than classic competitors
We used the Baby comp for almost 12 years, which was great, but limited. Daysy makes data available to you by using the ios or android app, and there is also an option for making data available for husbands. This device can help you plan your family in a sustainable and healthy way.
Stori Evans –
Learning curve, easy to use, fun, interesting
This a great alternative if you trying to avoid hormonal birth control. I have been using it over a month and learning about how it works before I get married this fall. I am still learning about this device ,but after awhile you get the hang of it. It also has helped me to learn more about my body and the way it works more so than I knew before. The videos for Daysy on the website is very helpful and highly suggest it. Also the people on the website are awesome at answering questions/helping.
Richard –
Takes forever to learn your cycle
I bought this wanting to go the natural route with family planning postpartum, I looked at 3 others options and went with Daysy thinking it was the most convenient. I started using it 3 months PP (mid March 2023) and it’s now almost the end of July and it’s still in the learning phase when there’s clearly a steady pattern. It’s gotten to the point where my husband I make jokes about this ridiculous learning curve. All in all it’s turning into a $300 thermometer that does nothing and I wish I had purchased a different device. Save your money and avoid this.
Luke –
This has been such a game changer for me and my partner. I’ve been using this for 1 year and I will never go back to Birth Control. I was on the implant for 6 years before finally making the switch. We have had no accidents and I get lots of green days now.When you get the Daysy, it takes time for it to learn your cycle, you must be prepared to be patient. There are reviews on here moaning because they’ve only waited 3 months, it took mine about 8 months before I was consistently getting lots and lots of green days. From months 3-6 I was getting about 5 green days a month (including period). Now I’m sat at 15 green days a month.I’ve also seen people recommend Natural Cycles as a replacement for this. The Daysy is far superior. My sister in law was on Natural Cycles while I was on Daysy, she just recently welcomed a baby into the family two months ago.Patience is key with this device to reap the rewards. This isn’t a ‘quick fix’. You are potentially undoing, years of birth control / hormone damage. Your body needs time to sort itself out and you will get a lot of yellow / red days during this time period. Yes it’s frustrating but my god it’s so worth it.
Jessica Roy-Nourry –
J’utilise Daysy depuis 9 mois maintenant (et je le recommande à toutes les filles de mon entourage). Mon conjoint et moi sommes HYYYYPER satisfait de son efficacité à nous guider quant à notre moyen de contraception naturel. Grâce à Daysy, non-seulement moi, mais mon conjoint connaît également mon cycle menstruel par coeur ainsi que chacune de ses phases (et symptômes rattachés à celles-ci). La batterie dure une éternité avant de devoir le charger, ce qui nous permet de partir en voyage et de l’utiliser avec facilité (et hop en dessous de l’oreiller, première action au réveil).Pour mon couple, il s’agit d’un RÉEL investissement. J’ai également hâte de l’essayer à la conception de notre premier bébé, afin de suivre le meilleur moment pour concevoir. Je ne comprends pas pourquoi il ne se vend plus sur Amazon, je l’adore.
Diana fuel –
La verdad lo compre hace más de 8 meses por mi deseo de quedar en embarazo y no había puesto reseña esperando y mirando todas las opciones por si era solo a mi que no me funcionaba, hasta lo envié a Alemania y lo revisaron, dicen que funciona perfectamente pero que soy yo quien no sabe utilizarlo…como si abriendo la boca y meterse un medidor fuece de mucha ciencia, en fin por más que pedí devolución de dinero, no me lo dan porque a ellos si les funciona y claro no pierden…así que 300€ tirados a la basura…es más tengo aplicación de calendario menstrual gratuito en mi móvil y funciona mejor, aparte que aunque esté Daysi no me mide la temperatura, si me dice los días en que me va a llegar la regla y los días fértiles y los días que no, entonces para que tenerlo? Si me da la misma información que mi aplicación gratuita en móvil?no es confiable, porque loa información que da no es relevante y no me da seguridad que me ayudara a algo
TaN –
Trovo Daysy fantastica! É semplice da usare e insieme al Applicazione si ha la propria temperatura sotto controllo. Consigliatissima!!!
Amazon Kunde –
Ich leide seit Jahren unter wirklich schlimmer Migräne. Weil nichts hilft, habe ich mich dazu entschieden, die Pille abzusetzen. Ich war ziemlich verzweifelt, weil ich nicht wusste, wie ich jetzt verhüten soll. Auf der Suche nach einer Alternative bin ich auf Daysy gestoßen. Ich bin wirklich sehr sehr happy. Nach fünf Monaten hormonfrei hat sich meine Migräne deutlich verbessert.Anfangs war ich etwas skeptisch, da man ja immer wieder von den 99 % Sicherheit liest und ich mir dachte: „Kann ich mich wirklich darauf verlassen?“. Es hat eine Weile gedauert, bis ich Vertrauen gefasst habe.Mittlerweile klappt es aber super für mich. Daysy erkennt zuverlässig meinen Eisprung und zeigt mir das fruchtbare Fenster mit ein paar Puffertagen an. Gerade dieses kleine Sicherheitsplus gibt mir ein gutes Gefühl. Ich finde es toll, dass ich meinen Körper dadurch viel besser kennenlerne und nicht mehr auf Hormone angewiesen bin.Natürlich gibt es auch Zyklen mit vielen roten oder gelben Tagen, was manchmal ein bisschen nervig sein kann. Aber mir ist die Genauigkeit wichtiger, und dafür lohnt es sich.Für mich persönlich ist Daysy eine echte Erleichterung und ich bin sehr froh, dass ich mich für diesen Zykluscomputer entschieden habe.