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🌟 Own Your Cycle, Own Your Future
Daysy Fertility Tracker is a hormone-free, FDA-registered smart basal body temperature monitor that predicts fertile and non-fertile days with 99.4% accuracy. Designed in Switzerland and crafted in Germany, it syncs via Bluetooth to a free app, providing personalized, real-time fertility insights without subscriptions or invasive methods—perfect for millennial professionals seeking precise, natural family planning.














| ASIN | B01HNCPTWQ |
| Additional Features | BBT Precision, Cycle Tracking, FDA-registered, Hormone-free, Ovulation Prediction |
| Age Range Description | Adult |
| Battery Cell Composition | Lithium Ion |
| Battery Cell Type | Lithium Ion |
| Best Sellers Rank | #240,432 in Health & Household ( See Top 100 in Health & Household ) #73 in Ovulation Tests #1,762 in Activity, Health & Wellness Monitors |
| Brand | Daysy |
| Built-In Media | Daysy sensor, sensor cap, and charging cable |
| Color | white |
| Connectivity Technology | Bluetooth, USB |
| Customer Reviews | 4.5 out of 5 stars 326 Reviews |
| Display Type | Digital |
| Item Dimensions | 1.81 x 1.89 x 0.87 inches |
| Item Length | 5.1 inches |
| Item Weight | 0.04 kg |
| Manufacturer | Valley Electronics AG |
| Model Name | Daysy |
| Model Number | Daysy |
| Special Feature | BBT Precision, Cycle Tracking, FDA-registered, Hormone-free, Ovulation Prediction |
| Style | Specialized |
| Style Name | Specialized |
| Unit Count | 1 Count |
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 ❤️
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**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**L
Fácil de usar
Tienen la mejor atención al cliente. Me encanta este termómetro y su app es muy fácil de usar.
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.
A**N
Meet my new best pal, Daysy
I absolutely love Daysy. She has been very easy to use and has taken away the fear and human error risk when it comes the fertility awareness method. $300 is a hefty price tag, but 100% work it.
A**.
Approved
Really accurate, takes some time for it to adjust to your personal needs but really food
C**.
Perfect to know your cycle!
Amazing tool!
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**S
Die beste Investition!
(Ich schreibe vom Account meines Mannes, da wir einen gemeinsamen Amazon Account haben) Ich liebe meine Daysy! Ich nutze sie bereits 1,5 Jahre und habe nun eine als Geburtstagsgeschenk für meine Freundin bestellt! Ich habe damals mit 0 Ahnung über meinen Zyklus und Zyklustracking gestartet und jetzt ist sogar meine Frauenärztin immer überrascht, was ich alles über meine Zyklusgesundheit weiß. Für mich ist es einfach super, dass ich nicht immer zur selben Uhrzeit messen muss, sondern einfach dann, wenn ich aufstehe. Die Vorhersagen stimmen bei mir immer über ein und auch das fruchtbare Fenster grenzt sie korrekt ein (wobei sie hier schon etwas konservativer berechnet - Ich habe immer zwischen 9-10 rote Tage im Zyklus und fühle mich so ganz sicher). Ich muss wirklich sagen, dass das Tracking für mich viel verändert hat und ich dadurch einen viel nachsichtigeren Umgang mit mir und meinem Zyklus gelernt habe. Ich spüre mittlerweile wann ich in welcher Phase bin, kann meine Gefühle besser einordnen und einfach selbstbestimmter mit meinem Körper umgehen. Ich kann sie nur weiterempfehlen!
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!!!
Trustpilot
3 days ago
2 weeks ago