Spot your phase
Log your period and symptoms; Her-OS places where you are in your cycle.
Hormonal health
Track your cycle, understand your energy
With Her-OS, cycle tracking goes beyond a calendar: your AI companion spots your phase, explains what you're feeling and tailors advice to your energy, sleep and mood — from the first day of your period to menopause.
Understand your four phases
The menstrual cycle unfolds in four phases — menstrual, follicular, ovulatory and luteal — driven by your hormones. Each has its own profile of energy, mood and sleep, which is why you feel unstoppable one week and wiped out the next. Instead of being caught off guard, Her-OS helps you anticipate these shifts.
For the details of each phase and its effects, read our full guide: Menstrual cycle: the 4 phases and their effects.
What Her-OS does for you
Explain what you feel
Fatigue, irritability, a surge of energy: understand the why, without guilt.
Tailor its advice
Workouts, food, sleep, planning: suggestions aligned with your phase.
Support through menopause
From perimenopause to lasting changes, a presence that adapts.
Laura, your wellbeing confidante
Your cycle isn't just numbers. Laura listens gently, answers your questions without taboo, and tells you when it's better to actually see a professional.
- Zero judgement — ask anything, even the awkward stuff.
- Tailored advice — to your phase and how you feel today.
- Reliable pointers — and a nudge toward a pro when needed.
Go further
Energy and mood aren't the only things affected: aligning your workouts and food with your cycle can change your daily life. Discover Cycle syncing: align energy, workouts and food and, if a new stage is approaching, Perimenopause: what changes and how to prepare.
The health pointers here (cycle length, phases) draw on reference sources such as the NHS and the World Health Organization. For general information only, updated 2026.
Important: Her-OS is an information tool, not a medical device or a form of contraception. For any unusual symptom or health decision, see a professional.
Frequently asked questions
What are the 4 phases of the menstrual cycle?
The menstrual cycle has four phases: the menstrual phase (your period), the follicular phase (energy rising), the ovulatory phase (around ovulation, with peak fertility and energy) and the luteal phase (before your period, when premenstrual symptoms can appear). Each phase has a distinct hormonal profile, which explains your shifts in energy and mood across the month.
How long is a normal menstrual cycle?
A cycle averages around 28 days, but any length from 24 to 38 days is considered normal. What matters most is the regularity of your own rhythm, not the ideal 28-day mark.
Is Her-OS cycle tracking a form of contraception?
No. Cycle tracking helps you understand your body and estimate your fertile window, but it's never a reliable form of contraception on its own. For contraception, talk to a healthcare professional.
Does Her-OS work if my cycle is irregular?
Yes. Her-OS uses what you log to spot your patterns, even with an irregular cycle. If your cycles become very irregular or change suddenly, it's best to see a professional.
Does Her-OS support menopause?
Yes. From perimenopause to lasting changes, your companions tailor their advice to your stage of life and stay available, without taboo, at any hour.
Reconnect with your body
Understand your cycle, follow your energy
Start for free and let Her-OS adapt to you.