A Faith-Centered Fertility App Women Can Trust: Meet PeakDay
As Catholic women, we’re taught that our bodies are not problems to be fixed or managed away—they are gifts. And yet, when it comes to understanding our cycles, many of us turn to apps that don’t reflect that truth at all.
Maybe you’ve noticed it too. You download a fertility or period-tracking app with good intentions, only to be met with content that promotes birth control, abortion, or a view of fertility that feels disconnected from what the Church teaches about the dignity of women and the gift of life. What should be a simple, empowering tool can quickly feel uncomfortable—or even discouraging.
That’s why the Fertility Science Institute by Couple to Couple League created PeakDay: a Catholic fertility and period-tracking app designed to help women understand their bodies in a way that is rooted in both sound science and faith.
Over the past year, nearly 200,000 women have downloaded PeakDay, many of them searching for a way to chart their cycles naturally without compromising their beliefs. For Catholic women at every stage of life—teens learning about their cycles, single women, engaged and married women, and mothers—PeakDay offers a safe and trustworthy place to begin.
“So many women want to understand their bodies without medical intervention or morally problematic content,” says Katie Zulanas, Executive Director of Couple to Couple League. “PeakDay was created to protect women’s dignity, privacy, and faith while giving them real, usable tools.”
Designed With Catholic Women in Mind
PeakDay is intentionally different from mainstream fertility apps.
The free version allows women to easily track periods and ovulation patterns. The premium version offers more detailed charting, helping women recognize fertility phases and overall cycle health—an important piece of caring for the body God has given us.
With PeakDay, women can:
Chart their cycles using methods aligned with Catholic teaching
Receive guidance from trained fertility coaches
Share charts with an instructor or medical professional
Invite their husband to chart together, fostering shared responsibility and communication
Sync with health tools like Apple Watch, Fitbit, and Oura Ring
And because respect for the person includes respect for privacy, PeakDay does not sell user data or push ads that conflict with Church teaching.
For many women, PeakDay becomes more than an app—it’s an introduction to the Fertility Science Institute’s broader mission. Through programs like Start to Chart for young adults, Mother–Daughter courses, and Natural Family Planning classes for couples, FSI supports Catholic families with education that honors both faith and reason.
Beginning the Year With Intention
A new year is a natural time to reflect, reset, and care for our health—body and soul. A woman’s cycle can be one of the clearest indicators of overall wellness, and learning to understand it can be an act of stewardship and gratitude.
To help women start 2026 with confidence, PeakDay is offering a free 60-day trial of premium features, inviting women to take a personal challenge to better understand their cycles and grow in fertility awareness.
“Learning your cycle can be deeply empowering,” Zulanas shares. “When women understand how their bodies work, they’re better equipped to make healthy, faithful choices.”
If you’ve been looking for a fertility app that aligns with your Catholic values—one that respects your dignity, protects your privacy, and supports you in living your faith—PeakDay was made for you.