HeySis: Cycle & Period Tracker
Ovulation Calendar & AI Sister
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Your cycle, mood and PMS — tracked in seconds and explained by Mia, an AI sister who truly talks with you. Private by design, no ads, no pressure.
HeySis is a period and cycle tracker that feels less like an app and more like texting an older sister who remembers your cycle, your mood, and how you actually feel. Open it and she just asks: “Hey! How are you today?”
Most trackers give you charts. HeySis gives you someone to talk to. Meet Mia, your AI companion who knows where you are in your cycle and explains what’s going on in plain, human words — no hormone lectures, no pressure.
WHY WOMEN KEEP HEYSIS
• A warm daily check-in instead of a 20-field form.
• Mia, an AI friend you can actually chat with about your period, mood, PMS and body.
• “This is normal” — honest reassurance, and a gentle nudge to see a doctor when something truly deserves a look.
• Private by design: your cycle data is yours. Stored on your device, heading toward end-to-end encryption. No ads, never sold.
CYCLE & PREDICTIONS
• Period start, length, cycle history and regularity.
• Predictions for your next period, ovulation and the fertile window.
• Late days handled calmly — no panic.
• A phase calendar — menstrual, follicular, ovulation, luteal — so “off” days finally make sense.
LOG IN ONE TAP
• Period and flow — one tap from the home screen.
• Mood, energy and mood swings.
• Symptoms: cramps, headache, fatigue, acne and dozens more.
• Discharge, ovulation and pregnancy tests.
• 90+ options — and none of them required. Log only what matters to you.
ASK MIA
• “Why is my period late?”, “Is this PMS?”, “Why do I get cramps?” — ask in everyday words.
• Mia answers around your own data: where you are in the cycle, what it may be, and what to watch next.
• Before any online AI is used, HeySis shows what limited summary would be sent and asks your consent — or keep Mia fully on-device.
• Mia never “chats through” alarming symptoms — she gently points you to a doctor instead.
GENTLE REMINDERS
• A heads-up before your period, on the expected day, and if it’s running late.
• Optional PMS and fertile-window reminders.
• At most one a day, in Mia’s warm voice — never any personal data in the text.
SHARE WITH YOUR PARTNER — BUILT IN
• Invite your partner or a close friend with a simple code.
• They see your current phase, today’s mood and concrete “how to support her” tips — never your symptoms or raw logs.
• They can send warmth back with reaction stickers.
• Free and built in — no separate partner app, no subscription.
A REPORT FOR YOUR DOCTOR
• One tap builds a clear PDF: last 6 cycles, regularity, key findings, symptom timing, 30-day diary.
• Made fully on your phone; it leaves only if you share it. Your chats with Mia are never included.
SELF-CHECKS & SHORT, HUMAN ARTICLES
• Gentle self-checks: late period, strong pain, heavy bleeding, unusual discharge and more.
• Quick reads on phases, PMS, pain, ovulation and discharge — backed by trusted sources (NHS and others).
• Plain guides to PCOS, endometriosis and PMDD.
SWITCHING FROM ANOTHER TRACKER?
• Import your history from Flo, Clue or an Apple Health export in a minute — your existing days are never overwritten.
APPLE HEALTH — ONLY WITH YOUR PERMISSION
• Optionally, Mia considers steps, sleep and temperature from Apple Health as background context.
• HeySis never writes anything to Health and never takes more than it needs.
HOW HEYSIS IS DIFFERENT
• Not a dashboard — a conversation. One gentle step at a time.
• Not “track everything” — just what helps Mia understand you.
• Not science overload — a friend who keeps it simple and warm.
• No streaks, no guilt, no pressure to log every day.
HeySis is for anyone who wants to understand their cycle without the overwhelm — regular or all over the place, curious about your body, riding out PMS, or just tired of facing it alone.
Mia is not a doctor and doesn’t diagnose. HeySis is educational and not a medical device: predictions are approximate, are not contraception, and don’t replace professional medical advice.
Terms of Use (EULA): https://heysiss.vercel.app/terms
HeySis now speaks 33 languages — maybe yours is already one of them.
Your cycle lives on the home screen in a widget that names nothing out loud. Gentle self-checks for the days you worry, short reads about phases and PMS, and a day card you can flick through. Mia writes at the right moments, and your circle gets quizzes for two and warmer reactions.
The developer, Danila Zakharov, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
- Sensitive Info
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Danila Zakharov
- Size
- 109.8 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 32 more
- English, Arabic, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Bokmål, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
- Age Rating
13+
- 13+
- This app has an age rating of 13+ with content restrictions.
Some content may be rated higher, and may therefore be restricted and managed by the developer through in-app controls. - In-App Controls
Age Assurance
Infrequent
Mature or Suggestive Themes
Medical Treatment information
Contains
User-Generated Content
Health or Wellness Topics
Social Media
Social Media (Age Restricted)
- In-App Purchases
Yes
- HeySis Premium Monthly $3.99
- HeySis Premium Yearly $19.99
- Copyright
- © 2026 HeySis