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🌿 Own Your Cycle, Own Your Future — Smart, Simple, and Subscription-Free
Daysy Fertility Tracker is a hormone-free, smart basal body temperature thermometer designed for precise ovulation and fertility monitoring. With 99.4% accuracy, a user-friendly red/green LED indicator, and a free companion app, Daysy empowers millennial professionals to make informed family planning decisions naturally. Engineered in Germany with decades of expertise, it offers a subscription-free, reusable solution for cycle tracking, conception, or pregnancy planning.














| ASIN | B01HNCPTWQ |
| Additional Features | High Accuracy |
| Age Range (Description) | Adult |
| Age Range Description | Adult |
| Battery Cell Composition | Lithium Ion |
| Battery Cell Type | Lithium Ion |
| Best Sellers Rank | #181,488 in Health & Household ( See Top 100 in Health & Household ) #63 in Ovulation Tests |
| Brand | Daysy |
| Built-In Media | Daysy sensor, sensor cap, and charging cable |
| Color | white |
| Customer Reviews | 4.5 out of 5 stars 324 Reviews |
| Display Type | Digital |
| Item Dimensions | 1.81 x 1.89 x 0.87 inches |
| Item Length | 5.1 Inches |
| Item Weight | 0.04 Kilograms |
| Manufacturer | Valley Electronics AG |
| Special Feature | High Accuracy |
| Style | Specialized |
| Style Name | Specialized |
| Unit Count | 1.0 Count |
G**Y
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.
A**L
Fácil de usar
Tienen la mejor atención al cliente. Me encanta este termómetro y su app es muy fácil de usar.
A**S
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 ❤️
A**6
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...
A**.
Approved
Really accurate, takes some time for it to adjust to your personal needs but really food
C**O
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.
S**S
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.
R**D
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.
L**E
Life Changing
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.
J**Y
9 mois d'utilisation, il est formidable!
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.
D**L
No funciona
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
T**N
Fantastica e sicura
Trovo Daysy fantastica! É semplice da usare e insieme al Applicazione si ha la propria temperatura sotto controllo. Consigliatissima!!!
A**E
Wegen Migräne die absolut beste Wahl für mich für die Verhütung
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.
Trustpilot
1 week ago
5 days ago