Daysy - Your personal fertility tracker (incl. free app DaysyDay)

Know your fertile days naturally. No hormones, no guesswork, no subscription.

Every morning, measure your basal body temperature in just 60 seconds. Daysy instantly tells you whether you're fertile or not, with over 99% accuracy, clinically proven over 40 years of research.

🔴 Red = fertile or possibly fertile
🟡 Yellow = fluctuating, possibly fertile
🟢 Green = not fertile

Is Daysy right for me?

Daysy is for you if you want to:

• Conceive and want to know your fertile window precisely
• Understand your cycle and body on a deeper level
• Ditch the pill and find a long-term, natural alternative

Common questions, answered

Is it really accurate if my cycle is irregular?
Yes. Daysy's algorithm learns your unique cycle over time, including irregular patterns.

What if I forget to measure one morning?
Daysy handles occasional missed measurements.

Is this a subscription?
No. Daysy is a one-time purchase. The DaysyDay app is free, with no ongoing fees or hidden costs.

Have more questions? Visit our Daysy and Lady-Comp FAQ page for detailed answers.

What's included

• Daysy fertility tracker
• Free DaysyDay app (cycle calendar, temperature curve, fertility forecast, partner sharing)
• Protective travel case
• Micro USB charging cable
• Quick guide and user manual

Why thousands of women trust Daysy

• 99.4% accuracy, clinically validated (EMA and FDA approved)
• Science-based algorithm with 40+ years of research and development
• Hormone-free and non-invasive
• Made in Germany by a family-owned company
• Lifetime expert support by phone and email
• 2-year warranty
• Free shipping across Australia
• ZIP payment plan available

99% of Daysy users would recommend it to a friend.

"I stopped taking the pill after 13 years and Daysy was the best thing to help me learn how to tune into the natural rhythm of my cycle. I wanted something really accurate, especially because I wasn't ready to have a baby yet." —K. Daysy customer