Your body has been speaking.

You were never taught to listen.

HLI is the first hormonal intelligence system that learns
your unique cycle — not averages. Not predictions.
Your actual biology, finally made legible.

500 founding members. Invitation only.

You’ve tracked your period for years.

You know when it’s coming. You still don’t know why you feel the way you do. Why energy craters three days before it arrives. Why certain weeks you’re unstoppable — and others, invisible.

Why you’ve been told these things are just ‘hormones’ as if that explanation ends the conversation. It doesn’t. Your body has been offering a more complete answer. No one built the system to receive it.

Until now.

HLI is not a period tracker.

It is a hormonal intelligence system—the first of its kind—that builds a living map of your unique cycle from your own data. Over time, it learns the grammar of your biology: what your hormones cause, what your lifestyle shifts, and how your body responds to the world you live in.

The result is something no app has given you before: not a prediction of when your period arrives, but a real-time interpretation of where you are in your cycle right now—and what that means for your energy, your mind, your body, your life.

Body literacy. Finally, at the level you deserve.

What this means for you

Other apps: Give you a calendar prediction based on your average cycle length.
HLI: Builds a personalized inference engine that adjusts in real time as your life changes.

Other apps: Learn from population data—millions of cycles averaged into one model.
HLI: Learns only from you. Your completed cycles. Your logged patterns. No one else’s data ever enters your fingerprint.

Other apps: Tell you when your period is coming.
HLI: Tells you where you are in your cycle right now—and what that means for your energy, your focus, your body today.

Other apps: Store your most intimate health data on their servers—and profit from it.
HLI: Stores everything on your device. We cannot access your data. Structurally, legally, architecturally impossible.

Every day, a 30-second check-in.

Tap through your mood, energy, and body signals. One-touch chips. No journaling required. Your data stays on your device—nowhere else.

By your third cycle, your map appears.

With each entry, HLI distinguishes between symptoms your hormones cause and factors your lifestyle creates—yielding a clearer picture of your unique cycle pattern.

HLI was built by PJ Vang—Stanford-trained product designer, researcher, and the woman who mapped her own hormonal fingerprint by accident. The clarity it brought changed everything.

“I realized that my entire life—and all women’s lives—are lived without this crucial, life-changing knowledge. No one teaches it. No system exists for it. I built HLI to be that system.”
— PJ Vang, Founder

PJ Vang

The Phase-Aligned Experience

HLI doesn’t just tell you where you are in your cycle. It tells you what to do about it. Each phase comes with a library of short, research-backed practices—designed specifically for where your hormones are right now.

Menstrual phase: Guided heat therapy for cramps. Restorative breathwork. Follicular phase: Rising energy met with HIIT programming. Creative momentum practices. Ovulatory phase: Communication techniques for peak expressiveness. Movement for strength and power. Luteal phase: Emotional regulation tools. PMS symptom management. Nourishing practices for the turn inward.

Every practice is short, equipment-free, and cited. Every completion is tracked—your notes and reflections—so your relationship with your body builds over time.

HLI requires a meaningful commitment.

That is by design.

Annual membership

$120 / year

Your own hormonal intelligence system

Body literacy that compounds

7-day trial—enough to feel HLI learn you

Apply for Early Access

Beta Founding Members

$96 / year

Locked forever – first 500 only

Community & input

Priority support

Apply for Founding Membership

HLI is accepting its first 500 founding members.

The application has one question: “Why do you want to learn your body’s language?” There is no wrong answer. There is only your answer.

About

Hormone Intelligence

Founder Story

Practices

Resources

Press

FAQ

Blog

Legal

Disclaimer

Contact

Support

Apply

Instagram

Your body has been speaking.

Your body has been speaking.

You were never taught to listen.HLI is the first hormonal intelligence system that learnsyour unique cycle — not averages. Not predictions.Your actual biology, finally made legible.500 founding members. Invitation only.

You were never taught to listen.HLI is the first hormonal intelligence system that learnsyour unique cycle — not averages. Not predictions.Your actual biology, finally made legible.500 founding members. Invitation only.

You’ve tracked your period for years.

You know when it’s coming. You still don’t know why you feel the way you do. Why energy craters three days before it arrives. Why certain weeks you’re unstoppable — and others, invisible.

Why you’ve been told these things are just ‘hormones’ as if that explanation ends the conversation. It doesn’t. Your body has been offering a more complete answer. No one built the system to receive it.

Until now.

HLI is not a period tracker.

It is a hormonal intelligence system—the first of its kind—that builds a living map of your unique cycle from your own data. Over time, it learns the grammar of your biology: what your hormones cause, what your lifestyle shifts, and how your body responds to the world you live in.

The result is something no app has given you before: not a prediction of when your period arrives, but a real-time interpretation of where you are in your cycle right now—and what that means for your energy, your mind, your body, your life.Body literacy. Finally, at the level you deserve.

What this means for you

Other apps: Give you a calendar prediction based on your average cycle length.HLI: Builds a personalized inference engine that adjusts in real time as your life changes.

Other apps: Learn from population data—millions of cycles averaged into one model.HLI: Learns only from you. Your completed cycles. Your logged patterns. No one else’s data ever enters your fingerprint.

Every day, a 30-second check-in.

By your third cycle, your map appears.

The Phase-Aligned Experience

HLI doesn’t just tell you where you are in your cycle. It tells you what to do about it. Each phase comes with a library of short, research-backed practices—designed specifically for where your hormones are right now.

Every practice is short, equipment-free, and cited. Every completion is tracked—your notes and reflections—so your relationship with your body builds over time.

HLI requires a meaningful commitment.

HLI requires a meaningful commitment.

That is by design.

That is by design.

HLI is accepting its first 500 founding members.

HLI is accepting its first 500 founding members.

The application has one question: “Why do you want to learn your body’s language?” There is no wrong answer. There is only your answer.

The application has one question: “Why do you want to learn your body’s language?” There is no wrong answer. There is only your answer.

You were never taught to listen.

HLI is the first hormonal intelligence system that learns
your unique cycle — not averages. Not predictions.
Your actual biology, finally made legible.

500 founding members. Invitation only.

You were never taught to listen.

HLI is the first hormonal intelligence system that learns
your unique cycle — not averages. Not predictions.
Your actual biology, finally made legible.

500 founding members. Invitation only.

The result is something no app has given you before: not a prediction of when your period arrives, but a real-time interpretation of where you are in your cycle right now—and what that means for your energy, your mind, your body, your life.

Body literacy. Finally, at the level you deserve.

Other apps: Give you a calendar prediction based on your average cycle length.
HLI: Builds a personalized inference engine that adjusts in real time as your life changes.

Other apps: Learn from population data—millions of cycles averaged into one model.
HLI: Learns only from you. Your completed cycles. Your logged patterns. No one else’s data ever enters your fingerprint.