Understand Your Cycle.
Take Control of Your Health.
A modern app for cycle tracking, TTC support, pregnancy tracking, and perimenopause tracking designed to give you clear insights, reliable predictions, and full control over your data.
Built with a focus on privacy, usability, and evidence-informed design.
Why It Matters
Your cycle reflects patterns, health signals, and changes over time.
Our goal is to turn complex data into simple, actionable insights you can actually use in your daily life.
What You Can Do
Everything you need to stay in tune with your body in one clear, supportive experience.
- Track your period
- Log symptoms
- Predict ovulation
- See your patterns
- Stay informed
Built on Data & Expertise
WT4 is developed with clinical expertise in women’s health, combining medical knowledge in obstetrics and gynecology with modern product design.
Built on data from over 600,000 women, the product is informed by large-scale patterns that we translate into clear, practical insights.
Every feature is designed to be simple to use, medically grounded, and focused on helping users better understand their own cycle and body.
Our approach prioritizes clarity, reliability, and respect for user autonomy, turning complex biological signals into information that is actually useful in everyday life.
Access for All
Our mission is to make trusted women’s health knowledge available to everyone, not only to people with easy access to specialists, paid resources, or strong local health systems.
We are building WT4 so clear, medically grounded guidance can reach women in every community, including places where reliable information is hardest to find. Your location should never decide how much you understand about your own body.
Privacy You Can Trust
Your health data belongs to you. We never sell your data, and we design WT4 so you stay in control of what you track, store, and share.
Privacy is not an extra feature. It is part of the product from the start, with responsible data handling, clear choices, and respect for user ownership at every step.
