Features Your Cycle How It Works Privacy The Study Join the Study
Private closed study · Now enrolling

Be one of
the first.
Join our
closed study.

codeXX.health is an AI-powered, privacy-first cycle intelligence app — and we're opening a private closed study to a small group of first users. Help shape the future of women's health and get early access before anyone else.

Limited spots Health data stays on your iPhone Science-backed
9:41
codeXX
Your cycle companion
Ovulation
Day 14 · 3 days
Peak Energy
Your most energetic phase. Perfect for high-intensity workouts and social activities.
Log Period
Symptoms
AI Chat
Pre-Workout Nutrition
Optimize energy for peak performance
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Calendar
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4
Cycle phases tracked
100%
Predictions calculated on your iPhone
6+
Pro features
0
Health entries stored in our cloud
Features

Everything your
cycle deserves.

A complete cycle intelligence platform — from daily tracking to AI-powered insights, all while keeping your most intimate health data completely private.

Smart Cycle Tracking

Log your period, flow intensity, symptoms, and mood with a tap. Intelligent predictions learn your unique patterns over time.

PRO

AI Health Chat

Ask your cycle anything, anytime. Your personal AI assistant understands your patterns and delivers science-backed answers — unlimited.

Phase-Based Insights

Get personalized nutrition, workout, and mindfulness recommendations tailored exactly to your current cycle phase. Every day, different.

Privacy-First AI

Predictions and recommendations are calculated on your iPhone, and your entries are stored there encrypted. Shared learning from the community comes next — only with your consent.

PRO

Symptom Trends

Discover patterns in your symptoms across weeks and months with beautiful charts and actionable, science-backed insights.

PRO

Doctor Export PDF

Generate a comprehensive health report ready for medical appointments. Share months of cycle data and symptom trends with your healthcare provider.

Your Cycle

Four phases.
One you.

Your cycle is more than a period — it's a dynamic hormonal system with four distinct phases, each with its own energy, mood, and opportunities for your body.

Days 1–5 · Menstrual

Rest & Restore

The shedding phase. Low energy is natural and intentional — prioritize gentle movement, iron-rich foods, and deep rest.

Days 6–13 · Follicular

Energy Rises

Estrogen climbs. Creativity and motivation surge — the perfect time for new projects, social activities, and harder workouts.

~Day 14 · Ovulation

Peak Confidence

Peak estrogen and testosterone. You're at your most energetic, magnetic, and communicative. Lean into it fully.

Days 15–28 · Luteal

Prepare & Wind Down

Progesterone rises. Focus on nourishing foods, mindfulness, and lighter exercise as your body prepares for the next cycle.

How It Works

Simple to start.
Powerful over time.

Get going in minutes. The longer you use codeXX.health, the smarter it becomes — learning your unique patterns entirely on your device.

1

Track Your Cycle

Log your period, flow, symptoms, and mood in seconds. Every data point makes your predictions and insights more accurate over time.

2

AI Learns Your Patterns

Your iPhone analyzes your unique cycle and learns which recommendations help you. Your health entries never leave your device.

3

Live Your Best Cycle

Receive daily personalized recommendations for nutrition, exercise, and mindfulness. Ask the AI anything. Export reports for your doctor. Know yourself.

App Preview

Beautifully designed
for every phase.

codeXX
Your cycle companion
Menstrual
Day 2
Rest & Restore
Prioritize gentle movement and iron-rich foods today.
Log Period
AI Chat
Iron-Rich Meal Plan
Tailored for menstrual phase
Home
Calendar
Track
Discover
Learn

Home Dashboard

AI Chat
Cycle Intelligence

You're in ovulation — your peak energy day! I'd recommend a high-intensity workout today. 🌟

What should I eat before my workout?

Complex carbs + lean protein 2h before. Oats with banana and almond butter is ideal. ✨

Amazing, thank you! What about post-workout?

Ask your cycle anything...

AI Health Chat

Calendar
March 2026
MenstrualDays 1–5
FollicularDays 6–13
Ovulation~Day 14
LutealDays 15–28
Home
Calendar
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Cycle Calendar

Privacy First

Your data stays
on your device.

We built codeXX.health on a simple premise: the most intimate health data in the world belongs on your iPhone, not on our servers.

On-Device Processing
Predictions and recommendations are calculated on your iPhone. Your entries are never uploaded. Only if you use the optional AI assistant are your question, cycle phase and symptom types sent — with your consent, processed in the EU and not stored.
Federated Learning (coming next)
We are building shared learning with differential privacy, so predictions improve from community patterns without anyone sharing their entries. It will only run with your consent.
Encrypted Storage
Your entries are encrypted by the app with a key protected by iOS. We cannot read them.
Closed Study · 2026

Be one of the first
in our closed study.

We're inviting a small group of first users into a private, invitation-based study of codeXX.health. Get early access, help shape the product, and be part of the future of privacy-first women's health. Leave your details and we'll personally reach out to selected participants.

✓ Invitation-based  ·  ✓ Limited spots  ·  ✓ No spam, ever

We store your name and email address only to contact you about the study and delete them when it ends. Details: Privacy Policy · Datenschutz

🎉 Thank you! You're on the list. We'll personally reach out to selected participants soon.
Something went wrong. Please check your details and try again in a moment.