Getting Started with Daysy

Begin your Daysy journey feeling confident and at ease. Here you’ll find everything you need for your first steps. From proper use and temperature measurement to understanding your basal temperature readings. The perfect introduction to natural cycle tracking.

YOUR ENTRY INTO THE WORLD OF DAYSY

Daysy

Here you’ll find everything you need to get started: a simple setup guide, helpful tutorials for daily use, and direct links to all essential resources. This way, you can use Daysy safely, quickly, and with full confidence.

Learn how to set up Daysy correctly and use it optimally from day one.

First steps

Discover step-by-step tutorials that clearly explain every part of using Daysy.

Video Tutorials

Get to know the DaysyDay app and see how it presents all your cycle data in a clear, intuitive way.

DaysyDay App

Daysy All-in-One Fertility Tracker – Your Smart Companion for Natural Cycle Tracking

The Daysy all-in-one fertility tracker is one of the most precise fertility computers in the world. Developed in Germany since 2014, the Daysy all-in-one fertility tracker combines advanced measurement technology with a clinically validated algorithm – making natural cycle tracking simpler than ever. Measure for 60 seconds every morning, check your light signal, start your day. That's all it takes.

What Makes the Daysy All-in-One Fertility Tracker So Different?

The Daysy all-in-one fertility tracker measures basal body temperature (BBT) sublingually with a precision of 0.05°C (0.09°F) – the most physiologically stable measurement point in the body. Continuously tracking wearables like rings or armbands capture skin or wrist temperature instead, which fluctuates with sleep position, room temperature, and movement. Many of these devices also only output relative temperature changes rather than absolute values – making them methodologically incomparable to a sublingual BBT reading. The Daysy all-in-one fertility tracker measures exactly what is clinically validated: true resting core body temperature, every morning, with 99.4% accuracy.

Daysy All-in-One Fertility Tracker – Hormone-Free Tracking for Every Stage of Life

The Daysy all-in-one fertility tracker works entirely without hormones. It does not interfere with your natural cycle, does not alter any bodily functions, and has zero side effects. Instead, the Daysy all-in-one fertility tracker reads what your body communicates every single day – your basal body temperature – and turns that signal into clear, actionable information.

That makes the Daysy all-in-one fertility tracker the right choice for women who want to actively understand their cycle. For anyone looking for a natural, body-based approach to cycle awareness. For women reconnecting with their natural cycle after years of hormonal use. And for everyone who wants a reliable, hormone-free method of cycle tracking – whether they're trying to conceive, avoid pregnancy, or simply know their body better.

Simple. Precise. No Subscription.

One of the biggest advantages of the Daysy all-in-one fertility tracker over most digital alternatives: no monthly fees, no subscription, no hidden costs. You buy the Daysy all-in-one fertility tracker once – and use it for as long as you want. The DaysyDay App is free. The Partner App is free. The Daysy all-in-one fertility tracker is fully ready to use from day one – no additional purchases or subscriptions required, ever.

Daysy All-in-One Fertility Tracker. Made in Germany. Clinically validated. Hormone-free. No subscription. Built for a life in tune with your body.