HeySis: Cycle & Period Tracker

HeySis (Hey Sis) is a period tracker and period calendar with Mia, an AI big sister you can text. Log your period in one tap and see your next period and ovulation ahead.

Wondering “Why is my period late?” or “Is this PMS?” Ask Mia. She explains your menstrual cycle in plain words, based on what you log. No pressure, no diagnoses.

Tracking your period, cycle and symptoms is free. Your diary is stored on your phone, and cloud sync is optional. No ads.

Period calendar & cycle predictions
• Period start, length, cycle history and regularity.
• Late days handled calmly — no panic.
• A phase calendar: menstrual, follicular, ovulation, luteal.

Track your period, PMS & symptoms
• Flow, mood, energy and mood swings.
• Symptoms: cramps, headache, fatigue, acne and dozens more.
• 90+ options, none of them required.

Ask Mia about your cycle
• Ask in everyday words. Mia looks at your cycle and what you’ve logged, then explains what it may be and what to watch next.
• Mia goes online only with your consent. Then she sends your message and the context she needs, such as your name, age, cycle, mood, notes and what friends share in Circle.
• Without consent, Mia gives only short general tips; tracking and reminders work as usual.

Period reminders
• A heads-up before your period and on the expected day.
• Optional reminders for a late period and PMS; never more than one cycle reminder a day.
• Circle notifications may show names and shared status.

Share your cycle with a partner
• Invite your partner or close friends to your Circle with a simple code.
• They see your phase and cycle day, when your period is due, your mood and what you’d like today. Your symptoms and notes stay with you.
• Partner mode is free, and your partner can send you stickers; sending them yourself needs Premium.

Switching from another period app?
• From Flo or Clue? Add screenshots of your old calendar, and HeySis reads your period days right on your phone. Days you already logged stay as they are.

Free and Premium
The period and cycle tracker, Mia and reminders are free. Premium, an optional subscription, adds the article library, daily card readings, four more pets, Circle details and pair quiz results, and more messages with Mia.

Your data, your choice
• Optional cloud sync encrypts diary content before upload; dates and sync metadata remain visible to the service.
• Online Mia and Circle start only after you say yes. You can switch off Mia’s online replies at any time.
• See the Privacy Policy for details.

Mia doesn’t diagnose. HeySis is for information only: predictions are approximate and don’t replace professional advice.